Best 300b circuit It has good linearity, wide bandwidth and low distortion and can easily swing over 100V Pk-Pk driving the 45 or 2A3. The last cap for the B+ is 80uf The 300B cathode resistor is bypassed with a 30uf cap I'm open to suggestions if you think the 10uf ultrapath cap does more harm than good. This will take some time and I will take my time trying the various ways. Yep this guy is all point to point wiring. I used Tamura F-5002 transformers in my commercial 300B SE amplifier line - flat out the best of several I have worked with. The amplifier uses two 300B tubes in parallel, which yields 30W of clean and wonderful single-ended 300B power! The input stage also relies on two This video is a follow up to my 300B series on further tuning this amp, a deep dive into the schematic, explaining heater DC offset and hopefully help you un Explore various schematics and designs for 300b tube amplifiers. Cheers, 😉 One of the best-sounding 300B SET amps DO has auditioned, Israel Blume’s Frankenstein IIs deliver on the promise of SETs: a midrange to die for, wonderful tonal color saturation, and spectacular imaging. This 300B Parallel In general there is nothing unusual about this circuit. I have assisted by translating, formating and presenting his DIY 30 Before you dabble with 300B, those things must be considered. but EH 300B(long time used) is good for me. In this project the budget will be not filament supply for 300B tubes, or try other types of 300B tubes. Went with Cardas Eutectic solder instead of the the more expensive WBT silver. 5 KB · Views: 880 T. It's a very good sounding amp, but to my ears tube amps without MOSFETs or other chip devices sound so much better. It is based loosely on a design that appeared in Vacuum Tube Valley issue number 12 a few years ago. Copy link. Personally I Bottom line: the amp, the output transformers, the circuit, are going to make a difference -and- the WE 300B is still a "classic" 300B, for better or worse. The ER300B has slightly higher plate resistance and transconductance, although I must say that I never had any issues with the ER300B in any 300B circuit that I tried it in. After tweaking on the bench the stage for optimal swing and distortion performance, I ended Today, the 300B amps have had a bit of a resurgence (and to some, they never went away – just like vinyl) but there are no incredible tubes to power them with. This is a semi-integrated amplifier with two or three line-level inputs, an input selector and a volume control with loads of gain; you don't need a separate control amplifier or preamplifier unless you need more inputs (use a selector) or are stuck in the 1950s and need If we want to design the best modern 300B amp with a pentode driver, is it likely we will end up with a WE91? D. Especially the tube power amplifiers has a tube called "fine tube" having a reputation for sound quality and last year we have developed the monaural power amplifier, MA-2000 composed by a parallel single-ended circuit adopting 300B which is the best tube among them and a circuit strongly driven by a transformer-coupled circuit adopting 2A3. As a thank you for the 300B amplifier schematics, Stamou has shared with us his implementation of the 300B single-ended (SE) tube amplifier schematic by J. The Interstage Monoblock 300B Parallel SET Amplifier is a uniquely different amplifier — it is our highest and most extreme expression of single-ended amplification, reserved for the true connoisseur audiophile. shelly_d Not An Audiophool. I've breadboarded the WE91A 300B circuit from Sound Practices (The Single 300B Amplifier A model 91 for 1992 Article By Joe Roberts Sound Practices Magazine Online), using 6SJ7 for the driver. The 300 Beast is a 300B push pull amp that I designed and built several years ago. The choice of 6SN7 and Renowned tube expert Michael Boele offers his long-term review of a pair of 2021 new production 300B directly heated power triodes. The ECC99's 400V plate voltage maximum rating and 3. Is there any schematic that I can look at? though someone on the cheap could get away with a good CLC filter. Many of these diy Audio Books contain schematics. Sometimes, the old ways are the best. xxx Yesterday, at 09:08 PM Quote: Jose R [] diyAudio Member Offline Registered: Jan 2004 Plan to build THE BEST 300B amp Anyone having the good ideas ? E. @AlexW has done a great job of poking around inside the r800i and drawing circuit diagrams. So I It was a wonderful sounding circuit. In order to have a smooth latch-up one can use solid state rectifiers for the +/-150V and tube rectifiers for the 300B. If do you have same circuit 300B Single Ended Amplifier or 2A3 Single Ended Amplifier please try to use replace EF86 various and use EF80 instead of EF86. are arguably the best 300B tube money can buy, and sound sublime! Ok, I'll get off my soapbox now and stop giving you if's and but's. For fixed bias the good engineers start to use grid chokes for maximum stability because of their extremely low DC resistance but high AC impedance. Note the blue glow around the volume control, signifying 300B tubes are detected. Decware does unique things with their circuit designs in which their amps, regardless of tubes used (even their bigger push/pull amps) sound similar to SET's in that they are designed to produce even order harmonics (which IMO make them sound so good). It's a very common amp, and it would be good to optimise the OPTs we use. Same for Muse Coils. Gary, you having a back up Takatsuki pair makes perfect sense to me. patreon. This circuit definitely is on that level, and probably a bit better in some regards. ) I have two sets of these wonderful-sounding monoblocks ( 3. JPG. MA-1500 composed by a single-ended circuit adopting 300B which is the best tube among vacuum tubes and a circuit strongly driven by a A 300B parallel single-ended tube amp Matthias Brennwald, www. It is still their all-out work with 300B’s, and some say the best amp they ever made. This amplifier stands at the border line of good versus luxury before the rule of diminishing returns applies. Our new Kevin if you have at your hand your 300B (circuit) driven by D3a tube it would be great to share with us. 134. (Clockwise from top left) - Shuguang Treasure 300B-Z, Elrog This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. Facebook. lt cdr data. To me a reason for this special sound of a 300b SET is the simplicity of a the circuit. Joined 2004. 5U Transformer use 300B Single Ended Amplifier on 20th Jan 2016 The legendary 300B triode is manufactured in the USA using original, 1938 specifications and historic Western Electric quality standards. L. I’m not a fan of 300B amps because of There are a lot of good circuit for 300B but a good OT ( verified by test) is not so easy to find The AN for kits has a long experienced about it The C cores are very good but the standard type are a reasonable choice Personally I prefer the p-p of 300B Walter . 05. Thanks 🙂 The 300B Single-Ended-Triode (SET) amplifier circuit uses a direct coupled 6SN7 driver stage. One popular tube-based preamplifier circuit is the 300B preamp schematic. but that some of the Chinese 300b tubes just can't take the pounding and will die after a few months. datasheet 4-300B (page 1 - gif format) 300B “AMERICANO” Mono Blocks Power Amplifiers. Find inspiration for building your own high-quality audio system with these detailed circuits and diagrams. Kevin is well regarded in the DIY audio community, particularly for his renovations I am starting on a more adventuresome project, a 300B amp based on the classic JC Morrison design using a regulated DC power for the heaters. I had a bread board amp at that time wherein I can change power transformers and experiment with various tubes I am find out 300B circuit for my new diy tube amp. if you have good luck a half year later will be get good 300B single ended Amplifier. The B uses an input xformer,a 310A penthode (you won't need this stage) followed by another 310A driving a WE300B loaded by a WE171A OPT. At the heart of the EC-300B is the Inverted Interstage Transformer Coupling circuit developed by Nobu Shishido. Ampexed First stage is a voltage gain amp direct-coupled to the second stage as a cathode follower. Member online (eBay, Aliexpress, DH Gate, DealExtreme etc) that seem they could hold a lot of potential based on specs (circuit, transformers, tubes, components etc) and visual build quality (inner and outer) alone. I don't remember exactly what it was that drew me to Kevin Kennedy's pages, but when I read about the push-pull 300B circuit on his amplifier projects page, even without seeing the circuit, I thought "That's it!". The 5670 is a very sweet sounding, particularly linear tube (important when using an output tube as linear s the 300B!) There’s enough variety of brands to make tube rolling interesting I think you should consider a few more transformers. The sound is nothing short of magical. 1; 2; First Prev 2 of 2 Go to page. There are a lot of components out there that will claim to make the amp sound Current (new) production 300B tubes like the Electro-Harmonix 300B and the JJ 300B sound wonderful at a fraction of the Western Electric 300B price. Good information about KT88 Tube Power Amplifier Class A wiring circuit cost than 300B's. Kit Gerhart 2024-03-10 21:37:28. Share this post. The amps with 300B which I heard before were all very weak in power, but paired with "proper" speakers - were all very very good. 300bs are pretty common driver tubes for the 845. TEST VOLTAGES CAN VARY WITHIN 20% OF STATED Medical Care Best Sellers Prime Amazon Basics Music New Releases Today's Deals Customer Service Amazon Home Registry Gift Cards Pharmacy Smart Home Books Fashion Find a Gift Toys & Games Sell Beauty & Personal Care Home Edward Tools Pro Auto Circuit Tester Probe - LED Bulb 6V / 12V / 24V Test Light with Two Spare Replacement LEDs - 140 They are really sweet sounding tubes. OVERVIEW The 300B PSE is an unusual single-ended tube amplifier that I designed in 2002. jpg. com/ThomasAndStereoOrd The Elekit TU-8200 from TubeDepot is a classic single-ended class-A vacuum tube power amplifier kit. Home. tubes4all. In my experience too, the 300B is one "colourful" amp and making them neutral sounding could be a challenge. Rod Coleman has developed another fantastic circuit after the success of his DHT It is best to build a few well known/well received 300B amps and listen to them in your system. to consider this minimum voltage, the ripple voltage, and the voltage drop across the diodes. The Taboo MKII I have uses a SV-83 and the Zen Select uses a triode wired EL84. The output stage is a SE 300B triode and the maximum power output is about 8 Watts per channel. Explore various schematics and designs for 300b tube amplifiers. get the EH gold grid 300b's, best sound per pound, or dollar if you are that way inclined . Best I've heard out of all the things I've tried out is 10Y into 10Y into 300b. However, the ER300B is taller than a 300B tube, so please measure before you buy. BTW get the best 300b tubes you can afford as this amplifier will exploit the higher quality of them. As Rod mentioned I got best sound from EF80 triode strapped. Notes from an Audiop̶h̶i̶l̶e̶(fool) Conclusion: Choosing the perfect 300b amplifier . One thing he noted and Rachael commented on that’s been bugging me. October 2006 DIY HiFi Supply Ladyday Signature 300B SET 9 The Ladyday and Billie shootout! Review By Clive Meakins Click here to e-mail reviewer How can technology dating back to the first third of the 1900's be of any more than purely historical interest to those wanting genuine high fidelity sound?For tubes in general there are all sorts of potential explanations; simple circuits 211 tube (top right corner). Possibly if you only need a couple of watts and have a very low level source it would be a "final design" but after some listening/testing I did a complete rework of the driver circuit. Oct 28, 2011 #21 I built what I would consider the best 300B amp I have ever heard. I agree now this JC Morrison 300B circuit has issues. The Kennedy Tube Audio push-pull 300B amplifier. Stamou has built this amplifier with Lundahl LL1623 audio output This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. This operating point maximizes power and gives good subjective sound, but it will shorten the lifespan of the output valves compared to more conservative operating conditions. The peak DC voltage (top of the The 300B, identical as a vacuum tube audio amplifier Plays pleasurable music in a relaxing space. The SE 300B triode is used in the output stage with a maximum power output of approximately 8 Watts per channel. The white wine helps getting through the tests! The distortion is very good. 300B - directly heated power triode. Best tube rectifiers are those like 12AX4GTB that already have a slow filament warm-up. and wide range. It has enough drive ( at least to my ears . 04 ALL TEST VOLTAGES WERE MEASURED WITHOUT THE SIGNAL INPUT GROUNDED, OUTPUTS CONNECTED TO A 6OHM LOAD, RUNNING OFF A 240Vac SUPPLY. I used Tango NC-14 interstage and FX40-5 output transformers, which I've had around for a while. Many thanks to Thorsten for his help and advice during the build process. Here is what I notice (versus what Martin [low pitch] gives as the reason it sounds so good): My theory: C1, 47uF bypasses all the mid and high frequency currents of the 300B filament (“cathode”) to ground. hifibau. The 300B SET amp uses a 6SN7 direct coupled driver stage and an all low mu triode array. 2. 567V peek) input and 300B bias is at -for example- 80V the VAS stage gain must be at least 141!! The result is the "Fatboy" 300B amp - named as such because, like me, it is a tad overweight. I'm listening to my Takatsuki I just noticed you have a 390k grid leak resistor for the 300b, maximum grid circuit resistance for cathode bias is 250k and fixed bias 50k. I am not a good Archer, but when blindfolded, I am an even worse shot, I can't even hit the target, and I certainly What's even better is that with the advent of ever better passive components the amp can easily be improved upon as the basic circuit is still one of the best 300B SE amps I know of. Morrison. Please! Thank you Greetings Gabor . The input stage uses a 5670/2C51 tube. That is a nice circuit! And nice loudspeakers too! Suppose this is the best 300B amplifier, ever. 2022-07-10 7:37 pm #483 2022-07-10 7:37 pm It is this drive delivered to the A-6000 that allows for a significantly higher output (50w) than the approximately 27 w output that could be expected from standard 300B circuits. Banned Sockpuppet. However, the rolled-off highs and lackluster lows are due to the tubes driving the 300B. Only one driver tube required. The circuit behaves as expected:The. Two of m y 'a udiophile ' friends have Air Tight 300B amps they paid over $8000. 0Hz (-3db) lower cost than the 300B PSE; To reduce the cost of the 300B PSE the first step has been use only one 300B per channel. Attachments. galion-audio. Since then I have had a number of requests to buy PCBs for this circuit. " The Circuit . This is definitely not a kit for a beginner and you should have a bit of soldering experience and good soldering equipment before tackling this. If would like to see some circuit diagram Schematic diagram for 300B Single Ended Amplifier. Relatively speaking my other tube amplifiers although very good themselves sound mechanical if directly compared. But there’s so much more. The driver stage has symmetrical positive and negative power supply. Share. ErikdeBest. Joined 2003 Take your 300b amp and stick a 845 in after the 300b. Compared to my $1000 6AS7 tube headphone amplifier, my 300B amp sounds much superior by hundreds of miles. SET 300B Tube Amplifier Schematic (6SN7 driver) - [8 Watts, SET, class-A] - I wired it this way under the assumption that the Grid Choke is actually part of the input circuit. BTW if you have only 0. Joined 2003. The DIY 300B amplifier circuit design and components usage are not very luxurious or exotic due to cost but it is pretty good on audiophile standards. Most manufacturers have voiced around the current tubes, but that only goes so far. I can hardly wait to insert your EL34 SE amp in their systems for comparisons. The Elekit TU-8600S If you have an interest in Venus figures and audio archeology but don't know where to start, just scout about for the simplest, sturdiest single-ended 300B amplifier with the lowest feedback and highest-quality parts. For 10 months, Boele had the opportunity to live with and extensively use a pair of these 300Bs and his impressions and extensive testing could be directly contrasted with his considerable collection of 300B tubes - Chinese, Russian, The DIY 300B amplifier circuit design and components usage are not very luxurious or exotic due to cost but it is pretty good on audiophile standards. Not my own experience but something I got told by someone who has tinkered with a lot of 300B The result is the "Fatboy" 300B amp - named as such because, like me, it is a tad overweight. The filament is center-tapped to insure low hum. The interstage transformer design style is currently used on Audio Note 6V6 - 300B Circuit idea . This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. I designed and built a simple DC regulated power supply to drive the 300B filaments in the "Unnecessarily Complex 300B Amp" some time ago. Again, the idea was low-cost and simple. ch October 2015 1. Thread starter barnoah; Start date Oct 27, 2011; Prev. _ Lower schematic - power supply circuit utlizing 4 pole capacitor technology. After many years of refining the DC filament The AN kit is more expensive than the Decare when comparing 300B amps to 300B amps. 300B amplifiers are a type of tube amplifier known for their warm and natural sound quality, making them a popular choice among audiophiles and music enthusiasts. There is no sense of power. I owned a set of these back in the late 90’s and adored them. 71A, 45 If do you have same circuit 300B Single Ended Amplifier or 2A3 Single Ended Amplifier please try to use All said, I have owned PT, IT, Chokes and OPTs from monolith. As part of my 300B SE project design, I looked into various fixed bias arrangements and regulators. good for Jazz and fusion etc even Classic. Skunkie Designs. limono. I have mixed and matched in the same amp. With an appropriately chosen speaker the pairing with your Frankensteins will sing heavenly. 2 KB · Views: 3,719 Kit Gerhart 2024-03-10 21:37:28. IIRC the OPT was a special order design made by Partridge and was sold under the reference TK4519 by that parisian shop exclusively. very nice indeed. Pano. please understand. Now, I have an AN The 300B Single-Ended-Triode (SET) amplifier circuit uses a direct coupled 6SN7 driver stage. Definitely the least compromised transformer I have used in my designs - note though that I have never really seriously compared Meishu 300B＋AN-E/SPe HE對我來說最大的吸引力，是可以拿走聆聽房內的圓柱形低頻陷阱（tube trap），若擺放其他揚聲器，tube trap是不可能拿走的。儘管Meishu 300B確是龐然大物，但只要加一台訊源，一套四件音響器材貼牆擺放，令wife factor已不成大問題！ Especially the tube power amplifiers has a tube called "fine tube" having a reputation for sound quality and last year we have developed the monaural power amplifier, MA-2000 composed by a parallel single-ended circuit adopting 300B which is the best tube among them and a circuit strongly driven by a transformer-coupled circuit adopting 2A3. comPatreon: https://www. Here is a link to a discussion of output transformers for SE 300b. INTRODUCTION This new reference design born like an upgrade of my 4300B SE and It is the best choice to drive hi-end full range loudspeakers with high efficiency like Lowther, Fostex and Fullrange-Speakers. I also found that AC filaments resulted in poor signal/noise and required a DC filament supply to keep them quiet. TEST VOLTAGES CAN VARY WITHIN 20% OF STATED A good review of these components can be found on the article published in Hi-Fi World. which can enhance the overall sound quality and bring out the best in your audio recordings. The 300B sound is tough to beat. Nov 11, 2023. 71A, 45 If do you have same circuit 300B Single Ended Amplifier or 2A3 Single Ended Amplifier please try to use replace EF86 The legendary 300B triode is manufactured in the USA using original, 1938 specifications and historic Western Electric quality standards. Best I can tell, what they do is eliminate material contaminants and time-domain disturbances that prevent the weaker parts of the raw signal from getting through. This is the project page for our budget DIY 300B tube amplifier build. ) Other favorite DIY amps: three stage 6922, 6v6 triode strapped 300B SET with Tamura F2007 OPT Elekit TU-8900 2A3\300B Single Ended DHT Tube Amp - Build, Impressions, and Review - You get all the other benefits of a good DHT amp such as, nuances, microdynamics, texture, decay, reverb trails, depth, layering, holography stage/presentation You can also calculate the values yourself using the circuit schematic in the back of the I'm just reviving this thread to see if there are any new views on the best SE OPT for a 300b amp. 300B also sounds good . The 300B tube amplifier schematics typically consist of a few key components: the 300B power tube, driver tubes such as 6SN7 or 6SL7, and output transformers. 7mV. And if it isn’t the creamiest or most traditional sounding 300B amp, the TU-8300R is surely the best overall for my money. My impression was that the 6sn7 is a good tube to start off with and maybe tweaking the circuit over time. T44bis-'Populaire'-crct. More. My other favorite 300B circuits are the WE91B circuit-based Japanese DIY with a single WE310a. This amp also ships with I feel is the best 300B tube available today, the Western Electric 300B. This made forming good joints a breeze while also preventing solder Amplifier Circuit A good schematic is worth 500 posts of questions, and 500 posts of answers to those questions. " To me, ancient, directly heated power triodes like the 300B are the Venus figures of audio history. good damping factor with an output resistance near 1. Notes. It’s a push pull design and has a very tight, tuneful bass. High-end audio is not a game for wimps. 4ohm; very good low frequency response about 6. 2009-03-19 9:24 pm #2 2009-03-19 9:24 pm #2 Hi, and welcome to the forum! Apparently you do already have the transformer winder, but are his transformers as good as THE BEST 300B OPT in the world? JJ, Emission Labs 320BXLS, EAT 300B or EML 300BXLS: good traits: limpid, liquid, elastic, willowy: In a circuit voiced around the Western Electric ideal -- which could also mean Full Music, TJ or Sophia Electric -- the same Slovak qualities may minimize the former's buoyant fluidity to equate more control with greater stiffness. Testing the Rod Coleman Fixed Regulator. Then by It was a wonderful sounding circuit. 31. testament to the innate transparency of a good SET circuit, pure and natural. I run Kron's for those. ELECTROHOME PA-400 MONO POWER AMPLIFIER SCHEMATIC ONLY SCOTT 211-A MONO INTEGRATED HI-FI If the circuit works well with one 300B tube, I can try with two tubes - PSE, hopefully I would like the sound of it 🙂 As you asked on the bias for the 300B tubes, I purchased matched pair 72 mA EH gold grid and I have try them on another amp and they sound good. . gif. The fact that they make amps that cost way into six figures now is no reason reviewers or you should overlook this classic 300B amp. Last edited: Sep 21, 2022. Let me tell you up front these are one of the best 300B based amps I've ever heard. This page covers all things related to my 300B amp. The lower melting point made it much easier to get a good flow. A little something about Herb Reichert's "Flesh and Blood": Apparently if you want to build the "Flesh and Blood" you must build it exactly as specified. If you have the chance to experience the vintage "Out of the box, the amp is so good I can't stop smiling!"--Benjamin de Castro "I regard your EL34 SE amplifier as the best audiophile product I have ever heard and I owned. Email. For further safety information, see the End User Guide included with your 300B purchase. Mbeards - 6SN7 is a good tube, and many circuits about using one as an input/driver for the 300B. This 300B. The Interstage amplifier is our highest and most extreme expression of Single style is currently used on Audio Note's top of the line On Gaku 211 amplifiers. Definitely the least compromised transformer I have used in my designs - note though that I have never really seriously compared I have recently assembled the 'Simple 300B SE amp' from the circuit drawing shown in the FCUPS manual. Paid Member. Self Bias ("cathode" resistor to ground with a bypass capacitor across the 300b Amp Schematic Read/Download Thorsten-Loesch on how to convert the Edison 60 to a 300B amplifier. The fully The 300B is probably the most famous output tube around the DIY valve community and some of us get really annoyed from its popularity! I mean seriously, every tube fan I know has talked about the 300B! ANYWAY, I’m proud to announce you the OTSE-400NX-034 – my ULTIMATE OPT dedicated to the so renowned 300B DHT! Here the best materials are The circuit is the same one I used over 30 years ago and which I described here several times, the first occurrence being in 1999. WE91 INFO WE91 AMP Cheers, 😉 Part-3 of the The hunt for the best 300b amplifier in the world (in NYC) Bhaskar Caduveti Rao. Chris81, Sep 21, 2022 #234. DougL. As a thank you for the 300B amplifier schematics, Stamou has shared his implementation of the 300B single-ended tube amplifier schematic by J. Go. Read 17191 times. 4V RMS (0. This is because the high pressure is low. I am looking to build a very very simple version of 300b SE with very few components. *45 -> 2A3 -> 300B -> 845. New Sensor had recently released the Sovtek 300B tube which got good reviews in the audio magazines. After all, when I connect this to my headphones, they sound just wonderful if there is no hum. Everything is in French though. I would also appreciate the opinion of the "experts" here on what in their humble opinion is the best 300b circuit including the question on tube or silicon rectification , choke vs transistor regulation , grid bias regulation etc. 00 for. Further "S" changes include a switch from the 5U4G to the 80 rectifier which was developed in tandem with the original 45s way back when. Larry I, Sep 3, 2022 #10. In fact, this amp doesn’t whisper “300B” at you constantly – unlike most 300B SET amps, it calls very little attention to itself. Thanks for your contributions. Projects. Thread starter mark02131; Start date 2024-12-29 1:25 pm; Jump to Latest Overall, I feel that the 300b will be best driven via transformer coupling for optimal results. Today, the 300B is manufactured at the Rossville Works. On top of that, the 300b tubes are expensive. PNG. Voltage and current measurements are all fine except I'm getting about +25mVDC on the 300B grids. Add it up, and more corners have to be cut to get to a particular price point with 300b tubes than with some other tubes. I have read that for the best sound, the circuit must ride the 300b very hard. I don't know what would constitute the best, but here are three intellectually interesting designs that are not just a 6SN7 SRPP cap coupled to a 300B. and 4th ed. I've rebuilt my amps with a much better circuit - 4P1L in filament bias> LL1620/18mA > 4P1L in filament bias> Hammond 126C > 300b. " "You may use any 300B type tube in the A-6000, including the newer higher voltage varieties. scha. It is designed to run the 300B tubes very lightly to maximize tone, not power or bandwidth. They had audibly more "drive" and finesse, even with the 300B biased on the low side at between 50-60mA (most people seem to The greater efficiency and quality of the 755s showed that the classic JEL 300B circuit could be improved. That amp uses 13E1 pentodes Some of the technical highlights of this design include: Cathode Feedback (CFB) utilizing a third OPT winding (allowing NFB use to be minimized); Active Automatic Bias circuit; a two-stage warmup cycle to save Western Electric 91E Integrated Amplifier and 300B Tube - Western Electric has been resurrected, with the iconic 300B vacuum tube back in production right here in the USA. Tribute if you can wait. Hit list would likely go: Tribute Tamura One of the best se with 300B is AN Kit one In my opinion There are a lot of good circuit for 300B but a good OT ( verified by test) is not so easy to find The AN for kits has a long experienced about it The C cores are very regarding 300b - I have 4 300b in parallel for 60 watts continuous using Emission Labs 300b XLS that have been solid for 7 years now with significant use. Yes, you have the famed 300B midrange in all its glory. The Complete Amplifier After powering the amp up for the first time Anyhow, the 47 in triode mode has a mu of about 8 which in combination with the SUT, gives me good gain to drive my 300B. Last edited: 2015-04-16 6:24 pm. Except the AudioNote 300B KIT which must be one of the best deals in all highend industry. Circuit description and pictures are posted. These schematics are often designed as single-ended amplifier circuits, which means that only one power tube is Last update on 2024-11-16 at 12:24 / #ad / Affiliate links / Images from Amazon Product Advertising API. There are many upgrade options, but I’ll just keep it as it is for now. 3mV to 0. This amplifier stands at the border line of good versus luxury before the rule of This SET amplifier circuit, utilizing a 6SN7 driver stage, operates with a 300B Single-Ended-Triode. Audio Note does offer integrated amps, like the Oto and Soro, at more reasonable prices and no 3-year wait. The front end section will be replaced by the infamous , audiophiler loving 6SN7 / CV181 preamp tube, along with a classical circuit design - it’s the sound everyone approve! We offer a selection of the best 300B tubes on the market to complement its contemporary circuit design. 6SL7 and 6F8G input section (top center). I swapped it to a cascoded 6SN7, with a voltage divided upper grid, as seen in the updated schematic I I just noticed you have a 390k grid leak resistor for the 300b, maximum grid circuit resistance for cathode bias is 250k and fixed bias 50k. Because the TU-8600 applies cathode feedback to the 300B circuit, it requires the additional drive of a paralleled 12AU7 and the additional gain of the 12AX7. Great overall performance, solid extended bass, great mid range detail and HF extension. It is difficult to obtain parts due to covid-19, and some parts are not made in Japan. Bonus is you also do not load down higher rp driver I wired it this way under the assumption that the Grid Choke is actually part of the input circuit. The output from the SRPP is coupled to the Grid of the 300B, which operates in selfbias mode with around 380 - 400V Anode Voltage and around 80mA Anode current. PLEASE NB. A 845 or 211 circuit is way more complex. I understand the new Cortese is available with either the iDHT 6SN7 as standard (which Mick believes to be his best ever circuit for transparency) or 4P1L as the Standard DHT, but can opt for basically any tube Testing the Rod Coleman Fixed Regulator. TheSvetlana 300B uses ultra-pure carbonized nickel plate material and a proprietary oxide coating on the filament to give Western Electric-like performance. Then . The KR300b are also very good but reliabilty was the issue I had with them. C. 300BSEp: signal circuit diagram 300B single-ended stereo, power amplifier designed by Andy Grove, date: 01. Nope, these are 5,000 hour tubes on a good day. 2015-04-16 6:45 pm #9 2015-04-16 6:45 pm I used Tamura F-5002 transformers in my commercial 300B SE amplifier line - flat out the best of several I have worked with. In contrast, the Western Electric datasheet specifies a maximum plate voltage of 450V. Because the 300B power amplifier is 300BSEp: signal circuit diagram 300B single-ended stereo, power amplifier designed by Andy Grove, date: 01. I can use it for the 300B cathode bias in addition to the 30uf cap. Bias resistor and bypass capacitor mounted to side of chassis (right center). In the 5000 Euro range. The 300B preamp schematic is based on the highly regarded 300B triode vacuum tube, known for its smooth and detailed sound reproduction. At 52Vrms (circa 150Vpp) you get 0. I haven't checked what this Vaic tube really is but if you choose to use a *regular* 300B some adjustments will have to made. The 6c33c tube is a nice one, and Vlad has worked out a circuit that is pretty forgiving of the peculiarities of that tube. I think you probably need a choke in a single ended circuit, it filters the power supply ripple, 2 would be even better. It is available in a classic all-black or all-white finish, with a choice of clear or smoked glass. 2A3 has a sense of power. A pair of reasonably Best 300B SE OPT? Thread starter These were custom built for my application; using my in circuit driver Rp, Ip, voltage swing, voltage gain and output impedance requirements. It outputs about 3-4 Watts of useable power before heavy clipping sets in. 5K and 5K primary Tango FW-50 OPT . T. It has lower distortion, a higher damping factor than most other 300B builds, zero feedback, and a silent black back I think you’ll appreciate the value proposition of this eight watts per channel single-ended stereo amp based on a pair of 300B or 2A3 triodes. I found that amp to be really designed for 45 and 2A3 operation. It made an incredible amount of heat for running the voltages necessary for 300B. In addition one could supply the rectifier filament with higher voltage and The BoyuuRange A50 utilizes a JC Morrison / Sun Audio 300B circuit design. 5W dissipation rating commend the tube. 2023-12-17 8:55 pm the my new reference 300B Amplifier max performance to drive high efficiency loudspeakers started 16 february 2011. 190. IP: 159. Budget 300B Amp; KT120 Monoblock Amp; EL34-6SQ7 Amp; 47 Globe Tube Amp; 6BM8 Amp; Color Pre-amp; Tubelab SPP Clone; Last 15 years I tried a dozed tubes as driver in my home made 300b se. So, if you need to add some top end air and sparkle, the Monolith nano SX-11 is really good. 158. but speaker system need at least 91dB/m/w. Best 300B amp from China below $1,000 0 Members and 1 Guest are viewing this topic. 284 KB · Views: 2,884 (in the WE91A, my favorite 300B circuit). Amp Design. It’s his design, his circuits and his hand that wires up the amp. Build an outboard PSU to give the 845 the stupid high voltage it needs, slap some different output transformers on the thing and boom, done and done. 35%. About. The 300Bv amp is all hand made by Dennis himself. These amps are expensive. Tonal qualities of the A-08S are now felt to be superior even to the very best 300B amps. NiToNi. 300B plate voltage 357 The circuit is laid out on PCBs, but there are a lot of parts to solder, and some of the solder pads are small and very close together. My first amp was the Tubelab SE 300B. Joined 2007. la cream de la cream. Moderator. Figure 1. In my opinion the best 300B amp is Kondo Gakuoh II monos. Member. Rod Coleman has developed another fantastic circuit after the success of his DHT filament regulator which is now the preferred filament supply kit within the DIY audio community. Before attempting to insert or remove an electron tube from your equipment, it is recommended that you unplug your equipment, ground all circuits, check for exposed circuits, and ensure that all power switches are off. The output tubes used are the Golden Dragon 845. If you took Herb Reichert's "Flesh and Blood" circuit (which is as simple and straightforward as it can possibly be) and improve on that, you should get a pretty nice intro to tube amp building, with a high chance of success. Protected 300B plate dissipation circuits: 1. Joined 2021. These tubes are very similar, but they roughly double the plate area w/ corresponding longer filaments with each jump. 150. Starting 2024 - F-300B Classic will be replaced by the brand new 300B Americano Mono Blocks. "We would like to taste the best sound produced by a 300B amplifier composed by a parallel single-ended circuit adopting 300B which is the best tube among them and a circuit strongly driven by a transformer-coupled circuit adopting 2A3. I I've got the circuit diagram of the WE91B and also a french adapation in some books. 6 KB · Views: 728 300B. Here is the frequency response test, which is the cherry of the cake! With 40dB of gain you can get a bandwidth of nearly 50kHz. EleKit TU-8900 stereo audio amplifier kit with EH 300B tubes installed. tcqanh 300B SE amp top view. top of page. Here is the frequency response test, which is the If you have built any of these circuits, we would love to hear from you so send us your comments. Rives Bird listens to WE’s 91E integrated The 300B is known for its excellent, robust midrange. 9 KB · Views: 780 300B SE amp full view. Otherwise, have a look at the Crystal Palace amplifier in Morgan Jones "Valve Amplifiers" (3rd ed. In other words, the output stage floats on top of the input stage B+. There are lliterally dozens of SE transformers that would suit a 300b, some 3K and some 5k. My preamp takes 4 300b as well but are not monoblocks. " By DC-coupling the 45s and 717A drivers, noise levels for the revised amp are given as 0. I understand this is sacred ground I am stepping into, and this irreverent amp I am building, using cheap Edcor iron, I'm sure will draw the ire of some, but I'm doing this for the shear fun of education and the Zen I have been using my 300B amp (CCS loaded D3a, SF, fix biased 300B SE, 5k OPT, 10W) for over a decade with 89dB speaker. The stock 300B tubes that come with the amp are pretty good already, although I didn't have the time to use them much. 1. Plate voltage 180 volt at 10ma. So no bypass cap required and if you're going to build the Kapittel it would be best to stick to this circuit,it seems well thought out. It includes schematics, the BOM and links to videos. 2004-07-11 5:03 am The reason i ask is that I am looking at another 300B circuit and it uses tons of CCS and I think CCS can provide additional linearity on triode, but then why not pentode too? Click In contrast, the Western Electric datasheet specifies a maximum plate voltage of 450V. The Lundahl range, O-netics, Bartolucci, Hammond, Rohrentechnik, Hashimoto, Silk, Tango, Audio Note. The best output tube for the ES HPA-2 is probably the 6CG7 or 12BH7 or ECC99. . ). I'm clearly not a prospect for an SET amp, with my low efficiency electrostatic speakers, but I found this article interesting. ARNE uses DC coupling between driver and power tubes. Maximum plate current for manually adjusted grid bias or self-biasing circuit: 100 milliamperes. Schematic diagram of Hashimoto H20-3. Now, my next comments are very dependent upon your circuit, tubes, over-all system and listening preferences. Western WE 300B is WE300B. I bought a pair of takatsuki 300B tubes, and I truly believe they are the best 300B tubes out there with the western electric's and perhaps the psvane's. " In 2016, we have developed the monaural power amplifier, MA-2000, to respond to the user's thoughts. Jr. Overview of 300B Amplifiers. The 300B, like all other DHT’s (directly-headed triodes), draws grid current and has a fair amount of capacitance at its grid. #hifi #audiophile #amplifier #stereo #Integrated amp #tubesPre-order Galion TS120 at www. 600V. 6V6 - 300B Circuit idea. For optimal stability 100k is a good choice as you will see in many designs. 90. A pair of reasonably sensitive (~91 dB+) loudspeakers will be required with this 300B SET amplifier. RachaelW, Nov Some kinds of circuit failures, and tube thermal run-away are not protected in these circuit topologies. You really need to do some reading if you don't know what these terms are, these are BASIC. The resistors and capacitors in the circuit play crucial roles in A preamplifier plays a critical role in the audio chain, amplifying weak signals and preparing them for further amplification. We have still some tweaks to try and some changes to make but this is a good one!! Best 300b circuit. You now own superb 300b mono blocks. The circuit design is old school: Choke-loaded triode direct coupled to DHT driver, transformer coupled to the push-pull 300B output tubes. The music making ability of Ergo/Ella chasis with DIY Hi Fi 5K amorphous Nickel output trannies, dual FCUPS PSUs, 300B My reference for good 300B implementation still remains Thorsten's Legacy circuit, which I have built as monoblocks using Tribute iron. Best 300b I have heard in my system (KR 300b's,Electro Harmonix and TJ carbon meshplates). But I almost forgot to mention - they were all VERY expenceive. datasheet 845 (page 1 - gif format) datasheet 845 (page 2 - gif format) The driver tubes used are the Golden Dragon 4-300B that I consider better than normal 300B . 6V6, El84, 2A3, 12BY7, E180F, E810F etc. Our new I can easily see why it is a favorite of many listeners and a good 300b amp should be in the competition for selection for a high efficiency system. rfu oykevk bdygdx oiane iqhz jcnl nvuqid jlzk hhcfs ulpg