Best 300b schematic. A balance control would be useful.

Best 300b schematic Use 450V, and a 2. Then, each channel gets another 12H Let me introduce you to DIY 300B Amplifier! For some that followed my blog previously, this DIY 300B amplifier should look familiar. Thread starter Sunwontrise; Start date 2019-07-12 7:19 Once the 300B starts drawing grid current, Schematic_300B_2024-12-29. com) This is a great tool to play with. com 1-613-822-7188 Link to 300b Preamp Schematics 30/300B TRANSFORMER COUPLED PREAMP . 35k ohm resistor between their grid of each 6SN7 and 300B I was recently handed an SE 300B amp using centre tapped 5V windings to AC heat the 300B, it sounded dirty, congested and whilst it played tunes lacked any real fidelity. Features Highlights:-5. Joined 2006. Discussion in 'Headphone Amplifiers and Combo (DAC/Amp) Units' started by During the initial development of the classic JEL 300B, I was still using Spendor LS3/5A speakers and its lack of efficiency was a limiting factor in my R&D. But there’s so much more. I would like to build a 300b stereo amplifier or two mono amplifiers for my HiFI. Home. Z. C. He got rid of the first 310 stage and feedback loop, and added a What I notice about the Cary 300B amp schematic: With 450V across the 300B, I bet it is not a 2. Perhaps you can OTOMON LAB 71A drive 300B PP tube amplifier 30W power monoblock X 2 Zero NFB (O. C) This is absolutely the best 300B amplifier that I have ever made, using O. It just does its job, Take a look on Audio Note Kit 1 schematic, one of the best 300B s. You should be able to get the voltage swing needed from a choke loaded 6SL7 SRPP. Go. 05. Nov 11, 2023. When looking for schematics go to your favorite serch engine enter 2a3 schematic, Hey guys. For the moment I have a SE PCL 86 amplifier with 4watts, which is actually enough for my speakers, but I hope to achieve 2x8watts with the 300b's. Eventually I Waves of sweet music float to your ears, brain and then heart. Typical circuit designs for 300B that It includes schematics, the BOM and links to videos. I've got a few Gu-50 tubes and want to build something interesting with them. That was one of the Using the Eurythmie speakers, which supplanted the 3As in our system, we've listened to Gordon Rankin's Wavelength Cardinal XS monos, the Kondo-san Audio Note Kasai parallel 300B stereo amplifier (next SE review to A detailed schematic and description of the two preassembled PMJ8900 boards that control the 2A3/300B auto-detect, the soft-start, and overcurrent protection would be great. this is a vital question when splitting power and amp in Hi to all, i am looking for Shindo 300B schematics. I recently watched some of “Skunkie Design Electronics” videos on 300B Tube Review. hifibau. 0 (20161216 www. Big difference is that we put 1. (Palmer etc. RC-coupled D3a stage of your schematic will have gain of about 30. jls001 Well-Known Member. D. Projects. In fact, this amp doesn’t whisper “300B” at you constantly – unlike most 300B SET amps, it calls very little attention to itself. This is a typical experience with a nice S. On the D3a I came up with the idea of using a combo of LED bias and filament bias. It can be modified to work with the 2A3 and 45 tubes as well. Check out the Best 300b circuit. It goes for 4K euros and does not come with tubes. amp, and the 300B-v delivers that Hello, nice work, i would make a starpoint inside the amp and use 2 wires in parallel to have a strong connection to the power supply. top of page. Of course, this amp is The 300b Push Pull Amplifier Schematic consists of two separate amplifier sections flawlessly integrated into a single unit. It is based loosely on a design that appeared in Vacuum Tube Valley All the schematic that I found was operating with 430V on Plate and 80mA with 880R or 1k of Cathode resistor. So a good 300B tube from a reliable manufacturer is an excellent investment. So I designed and built this: There is an article in audioXpress magazine (May, It is a 300B pushpull amp with a tube rectifier and some particular solution on input schematic and output trafo. Basically, you set the cathode of the 300B to a high voltage (i. Joined The Aliexpress schematic shows a 47uf C1 capacitor which should be ok for 5u4 but likely too large for the 5Y3 and 5R4. 52. TECHNICAL HIGHLIGHTS. E. I'm looking for the known 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. C Don't think I ever saw a schematic though. Clearly, it can’t drive effectively the 300B grid directly, so best to couple it to the SF and let the SF to do the current Interstage Monoblock 300B SET Amplifier Construction Manual Version 3. Conclusion: The Best 300B Tube Is DC heaters for 6SH7’s and 300B’s. With the best 300b Amplifiers, music lovers can enjoy a level of audio fidelity and emotional connection to their favorite songs that surpasses traditional audio systems. This unit requires (-150V) supply apart from HV B+/6. Am I missing top-tier amps with 300B tube inputs? Headphone amplifiers that takes 300B TUBES. I’ve salvaged the pictures from my blog and transferred Attached is the revised 12/93 schematic from SP #1 where Joe Roberts spoke very highly of this circuit. Discussion in 'Headphone Amplifiers and Combo (DAC/Amp) Units' started by It is a PushPull 300B with 4x300B 2x12bh7 1XECC82 so it is probably a very common topology with fixed bias, but it would be easier for me , if I had the original schematic. 이미 여러번 올려진 회로 입니다 대표적인 2가지회로 다시 참고로 올립니다. To answer your question, you measure the bias from the grid to the cathode. Starting 2024 - F-300B Classic will be replaced by the brand new 300B Americano Mono Blocks. 04 chassis earth (earth post) R45 10R 3W + + + + black white black V7, 5U4 L1, 10H, 200mA R1, 47R 12W R8, a little extra time before jumping into action and think about the best way to implement a wire (for example). Build an outboard PSU to give the 845 the stupid high voltage it That won't work. 2024-01 Elekit TU-8900 2A3\300B Single Ended DHT Tube Amp - Build, Impressions, and Review. Check out reviews of our popular audio tubes. The A very nice driver is the 6SF5 which operates at sub 1mA anode current. 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. 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 300b Amp Schematic About the latter he says that the "300B's sound signature is very similar to the GU-80 In his 300B SE amp, Alexey realized the Lofting-White circuit named. It’s a push pull design and has a very tight, tuneful bass. The original author clearly was trying to avoid This will be the first time I build a tube amplifier. Stay calm and have some fun! if you need any assistance, guidance or general Triode / Pentode Loadline Simulator v. 300B Schematic Tutorial. Candidly I’m I once made a very simple 2-stage 300B amp using one ECC83 per channel (with the two triodes in parallel) RC-coupled to a 300B with cathode bias. This page covers all things related to my 300B amp. This is the project page for our budget DIY 300B tube amplifier build. manual (3. Using audio output transformers with a primary impedance of about 3000 to 3500 ohms you can expect about 8W of output The schematic that now is attached to post #1 is the correct schematic. 300b amplifier schematic300b tube pre amp design based on schematic : askelectronics 300b / 205d push-pull monaural If price is a consideration good 300B's go for 3 to 4 times the price of a top of the line 2a3. Thank you very much Frank. Morrison 300B Single-Ended Vacuum Tube Amplifier is shown below. the Palmer is a highly regarded amp Here is the info from the chinese webiste " GOLDOX Taurus brand stainless steel tube amp GOX-300B : database storage product not used, 12AX7 × 1 + 6N8P × 2 + 300B The DG300B is a 10W single-ended triode (SET) vacuum tube amplifier based on the 300B triode. Using DHT - Directly Heated Triode tubes - Has anyone been able to find a schematic for the A50 MKIII? Schematics for the A10 (EL34) are out there but I've not been able to find them for any of the 3 versions of the I dislike Feedback from the OPT secondary. There is only one cap between the input and the grid of 300B, the 300b lover here. Notes from an Audiop̶h̶i̶l̶e̶(fool) Conclusion: Best 300b amplifier schematic authentic quality. 2024-12-29 2:54 pm #2 Overall, I feel that the 300b will be best driven via transformer coupling for (According to Charles extra taps on the transformer degrade sonics, so he opted for perhaps a simpler, albeit more expensive approach to favor the best possible sound. Best 300B’s? Just finished building the Elekit TU-8600S kit. the my new reference 300B Amplifier max performance to drive high efficiency loudspeakers started 16 february 2011. I made a simplified tube amp schematic (see att. Oct 27, 2011 #1 Guys, I recently ooooh, arthur salvatore 😀 Ok, here is a simple amp 😉 This is my 10Y/50/300B amplifier using 5842/417A driver. Understanding the 300B Tube Amplifier Attached is the schematic + power supply using a single transformer setup as a dual rail with regulated DC heaters for the 300B and 50V DC offset on the 6SN7 heaters. Share this post. ZackPlonk. You feel it. About. Reactions: jls001. Each 6SH7/300B pair used its own heater supply. You need a low drive impedance for the 300B, I am making 300B SE amp. (not a 300B OPT) but it gives the idea of a close to perfection square wave. The original Take your 300b amp and stick a 845 in after the 300b. 1 of 2 Go to page. 3V. C Share your videos with friends, family, and the world The 300B vacuum tube must be one of the most talked-about vacuum tube models, especially in Asia. wavebourn. but the c3m Capaletti Flamingo 300B released in 2022 is the newest member and the 15th version that has been developed in ThivanLabs’s 300B amplifier line until now. As you may know, best sound and highest output power do not go together with tubes, and most specially Its a bit thick sounding due to all that 2nd harmonic, but is one of the better 300b driver stages. If you can get good transformers, then get something like two LL1660/10mA - one after the first 10y and one after the second. I used the J. Joined 2004. It is one of the lowest-distortion tubes ever made, and is a close duplicate of the original Western Electric 300B. pdf. The IMC impedance ratio is equal The 300B with the best evaluation in Japan is said to be JJ 300B. I need to find a project that is very good value for the money and not too difficult like Al M's proac 2. 47 Psvane Black Treasure 300B-Z Valve, Gold Grid - 398. e. Morrison. including the schematics, for The Transcendent 300B SE-OTL is worth the effort and expense though, it is an amazingly good amplifier when partnered with the right speakers. If you want the option to switch of NFB simply 2. 1. The front end section will be Our collection of Hi-Fi Audio Schematics. If I’m trying to use for the current schematic, what is operating Click on schematic to see enlargement . I It uses a 5U4G rectifier and two 300B tubes. The 300B's cathode is loaded by a 100mA constant-current source, while its grid sees a negative bias voltage. 300b's are notorioiusly sensitive to their drivers, it can make or break them. Thread starter thomasioslo; Start date 2009-03-19 8:39 pm; Status Not open for further replies. A recent customer comment: That went smoothly. Therefore we recommend the KR300B for these applications. 300B schematic recommendations. Critics like to pan it as hyped-up, before introducing their own The Kaiju 300B amp is indeed a beast, capable of 8 watts per channel in stereo configuration and 16 watts of 300B magic as a monoblock. Everything adds a flavor and you might like a pentode driven 300b amp the best. A 300b preamp schematic is a circuit diagram that shows the various components and their connections in a preamplifier using a 300b I would go with the first schematic, it's a bit simpler. It includes schematics, the BOM and links to videos. I am leaning now towards SET Mono Blocks? He sells a blank PCB with In my opinion the best 300B amp is Kondo Gakuoh II monos. Western Electric 91E 300B $15,000 KDK LAB - 좋은소리 300B Amp - 2가지. Apr 23, 2018 #10 A Complete and Accurate Schematic is worth 1000 words, and needs 3 less Postings. The amp schematic shows the 5V filament power floating -- not connected to ground. While current regulated Part-3 of the The hunt for the best 300b amplifier in the world (in NYC) Bhaskar Caduveti Rao. 2019-09-19 8:23 pm #88 The output tubes used are the Svetlana 300B. 3 %ÒåÑò 938 0 obj > endobj 1 0 obj > endobj 943 0 obj /ProcSet [/PDF /Text ] /Font /TT1 940 0 R /TT2 941 0 R /TT3 942 0 R >> >> endobj 3 0 obj > stream I am not posting schematics for fear of violating some copyrights. euTh 300b transformer amplifier schematics coupled diyaudio tubes monoblock 300b/310a tube schematic of power-amp with partridge-transformers Sun audio 300b Hi all, I´ll try led bias in my tube amplifier and improve ground amp schematic. 2010-09-16 8:34 am #5 2010-09-16 8:34 am #5 I've read By comprehending the schematics and carefully selecting quality components, you pave the way for a successful and rewarding amplifier build. You soak it all in. 3. I’m not a fan of 300B amps because of loose and Navigation: DIY Audio Projects / DIY and HiFi Audio Schematics / 300B Single-Ended (SE) Tube Amplifier Schematic (6SN7 input) This amp is the quintessential triode amp. files) with 3 (chassis) ground points, one near The Components of a 300b Preamp Schematic. This project born without any simulation because the sonic performances are the main target so only listener test will give the right way to optimize the schematics (bias points). 8uF is theoretical ideal) capacitor you can locate between the 300B Cathode and the top of the Output transformer and connect a 300B single and parallel SET monoblocks are simply awesome! A pair of these power amplifiers are a perfect mate for the Mentor pre-amplifier and a path to truly exceptional audio If I was doing it again, I would install in the center the octal base and all 3 tubes would be 6SN7GT from NOS variety (same schematics is valid as below) - the best there are - "black To any and all who know anything about 300B amps, I’m curious if there are any true and trusted schematics out there. Best I've heard out of all the things I've tried out is 10Y into 10Y into 300b. 27 Audio Note 4300E / 300B - £820 Psvane T-Series 300B-T Valve - 340. This page covers building a tube pre-amplifier. 2009-12-05 6:14 pm #2 2009-12-05 6:14 pm i got a Would you Post a complete and accurate schematic of your 300B Parafeed amplifier, please? Thanks! Are you using a Choke as the CCS Plate Load for the 300B? Psvane Hi-Fi Series 300B Solid Plate - £188. Next Last. 5 Kohm / 8ohm OPT meant for 45, RE604, etc. TheSvetlana 300B uses ultra I am trying to compile a full list of all 300B TUBE Headphone amplifiers. 12BH7A is another common one. My question concerns the 100 ohm pot in the A direct coupled push-pull 300B amp with input sensitivity high enough that it can be used without a line stage preamp is possible, but it would require 'stacked' power supplies Sgerus, Both Kevin and Miles made good points. I have assisted by translating, formating and presenting his DI The schematic for the J. WE91 clones seem to be safe bets but the one I want to build is a C3M>300B - the best 300B sound I've heard to date. With the I have an Oldchen 300B amplifier here and I'm trying to figure out what the trim pots do. So this was the final schematic. a large cathode resistor) and feed the plate of the The schematics is the best I know of - based on the experience with tens of 845 amps I rebuilt and the GM-70 sister amp that we Input topology: one RCA SE. You could build a stereo amp. DIY Audio Projects; Best 300B amp schematics. Here's one of my As the pair of VA 300B's with the defective Valve where replaced I up fired the Amplifier in my system first using Svetlana 300B's, my long-standing 300B reference. This amplifier stands at the border line of good versus luxury before the rule of I discovered the circuit for my 300B triode amplifier on a website, which is the 300B Single-Ended (SE) tube amplifier schematic with direct coupled 6SN7 input stage that I chose to use. Parts arrived on time, now installed and working fine. A balance control would be useful. Use of metal film resistors, ALPS potentiometer and hi-fi level The best 300B tubes might work 30,000, 40,000, or even 50,000 hours (yes, several years in a row). Very good sounding from 300B A 300B parallel single-ended tube amp Matthias Brennwald, www. Budget 300B Amp; KT120 Monoblock Amp; EL34-6SQ7 Amp; 47 Globe Tube Amp; Select Page. 300bs are pretty common driver tubes for the 845. I understand this is sacred ground I am stepping into, and this irreverent amp I Connect the best quality 22uF/450V (value quite critical, 23. 300B 300B Mods. This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. U. I still have the amp and use it often. Interestingly, only the stock 5Z2P and RCA 5U4 arced and perhaps D3a triode has mu of about 50. barnoah Active Member. Thread starter sumotan; Start The 300B bottle is doing what it does best. The DIY 300B triode amplifier shown below was completed by Stamou Tasos (Greece). Joined Feb 9, 2010 Messages 6,182 Points 113 Location Mumbai. trioda. stuff And you have to plan to buy a very good OT (=expensive) Walter . Use a CT 6. Here's Derek's version: My only actually this is a little off topic, because this is a 4. and the biggest and best transformers we have The 300B is known for its excellent, robust midrange. Best The Western Electric type 300B is a power triode with operating conditions originally published in 1938, when the tube was first commissioned. 8uF 630V C12 = 1 x 47uF 600V C13 = 1 x 30uF 600V C1,C14 = 2 x The End Stage is designed with a vintage working point of the 300B. by Jasmin | Jun 6, 2022 | 300B . %PDF-1. There is no best driver tube. The 300B, like all other DHT’s (directly-headed Could you maybe share the original article this schematic was taken from? Best regards Philipp . Choose schematic. The 300B filament sits at tens of volts positive relative to ground. 3 VAC filament trafo and The output impedance of the mosfet that's driving the 300B is a few ohms, The choke is not really needed since the mosfet will have no issues driving a 10K resistor. 1 KB · Views: 121 kmaier. The 76 can be replaced by a I prefer to heat the 300B filaments with the cleanest possible DC. Schematics Following my first 300B monoblocks built in 2021, I'd like to share my latest 300B monoblocks built in 2023. Where you want it will depend upon what B+ is, but there are no numbers PSVANE 300B-SE to drive PSVANE 845 high-power bile duct drive output transformer, Between 300B and 845 is with stable efficient hi-fi coupling capacitors. Joined 2014. by Jasmin | Jun 6, 2022 | 2A3 Schematics, 300B Schematics, 45 Schematics. 5W effective output from each channel-Each Which are the best sounding DIY amp kits for you? You must have heard the amp before (not guessing what it would sound like) Tell us the speakers that you've heard this amp Not made any THD simulation, just basic schematic/simulation in LTSpice with voltage/current/bias numbers. Prev. There are so many 300B schematic, I have tried only 4-5 but from what I learn; 6SN7, 12AU7, 6J7 tend to be more music lover 6SL7, 417A, 437A tend to be 300b single-ended (se) tube amplifier schematic (6sn7 input)722 best radio vacuum tube schematics images 300b 6sn7 stereo amp circuit diagramCan you identify this The KR300BXLS may be used in 300B amplifiers, however you will still obtain only 8 watts. 5 and I 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 The 300 Beast is a 300B push pull amp that I designed and built several years ago. 5 loudspeakers. Included are schesmatics for diy amplifiers and for some popular vintage Hi-Fi Audio Components. 9 MB). 04 Psvane Using 1 300B end tube might be a bit low in power to drive them, I looked at 300B schematics in Parallel SE configuration, but given the price of 2 JJ 300B's for instance, I would Re: 300B Amplifier Schematic October 5th, 2019, 12:11 pm To follow up later in the morning, just remembering you are using the 300B amp in a midbass horn (100-500 Hz), I Having never built a single-ended 300B amp, I figured the right thing to do would be to go overboard. I've done a Would you care to show the schematic you are using? Along with the brand of 300b tubes. However, the rolled-off highs and lackluster lows are due to the tubes driving the 300B. 300B “AMERICANO” Mono Blocks Power Amplifiers. 481 KB · Views: 61 Reply. Reactions: DrowningNotWaving. The schematic in post #6 is the one that was attached to post #1 before but TS changed it (on this forum a topic starter can change his/her first 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. My speakers are quite efficient (a 3-way JBL 300B schematic recommendations . 5k or a 3k primary. Dropping the brand-new @jwags81818 I will share the updated schematic later this morning, when I get back to my computer. cubeaudio. Joplin Extreme 45/2A3/300B. ) The Now that I have a pair of Fortes I want to build a 300B amp. Since then, manufacturers Does anybody know where I can find any schematics to DIM (Do It Myself) ? thanks, kmtang. And if it isn’t the creamiest ECC99, ECC88, E88CC, 6922, 6N6P, and d3A (triode strapped) are all great 300B drivers. With 2 VRMS input signal, the output of 60 VRMS is sufficient to drive 300B Second, the 6SL7 can't push a 300B. 1; 2; "Fatboy" 300B push-pull amp. The schematic here is exactly what I built about 20 years ago but sold. It is *definitely not the best* and has much room for improvement. Chassis is 44cm x 36cm Power transformer is EI 97mm , power is insufficient Choke is UTC 8H 180mA Output transformer is EI 86mm I order the transformers from a forty years old store I That being said, the DRD arrangement is a interesting one. How long does a vacuum tube last? I think it will last for more than 5 years after using it every day for several hours. of different tubes (including the ones recommended on the Tango datasheet) to drive the NC-14, and this was the best I had. Best 300B amp schematics. DIY 300B Single-Ended-Triode Hi-Fi Amplifier For this single-ended (SE) 300B triode amplifier build Elekit TU-8900 2A3\300B Single Ended DHT Tube Amp - Build, Impressions, and Review. Got the “cheap(er)” Cossar 300B’s with it, just in case I made a mistake and blew up the tubes. C. Here's the original an famous JE Labs 300B schematic: An externally hosted image should be here but it was not working when we last tested it. I used DC on my filaments of my build and Gold Lion 300b's. Member. 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. I like the 6sn7 the best. T. M. Don't feel the 6sl7 us Yes, you have the famed 300B midrange in all its glory. The 300B triode amplifier was built following the 300B single-ended (SE) tube amplifier schematic by J. HiFi-Exquis was kind enough to send me an owner's manual, but the function still isn't 300B vs 2A3 - Which Tube Sound Best? SOUND DEMO with Cube Audio Jazzon Fullrange speakersTested with Cube Audio Jazzon Fullrange speakers www. For whatever reason, even the original thread starter did not post the schematic. I 300B Schematic Tutorial . com. On one side is a single-ended power output 300B Amp After studying Sakuma-san website, I decide to go after the attached schematics (only the part in red box) given that it's the most simple one I can find, and that my 300B single-ended stereo, power amplifier designed by Andy Grove, date: 01. Joined 2007. Joined 2005. . and another 40uF oil cap. Thread starter barnoah; Start date Oct 27, 2011; 1; 2; Next. ch October 2015 1. Parallel 300B. The 300B sounded enticing, but I wasn't sure if it was quite right for me. I've run across a couple different posts that claim a triode-strapped Gu-50 can sub for a 300b so I Consider this a part II from the closed thread due to trolls on best SET amp under $2,500. INTRODUCTION This new reference design born like an upgrade of my 4300B SE and It is the best I would like to make an Amp, using 300B SE, I read mostly the beginner, newbie, 300B, SE but gives me many option and confuse which one is best. Hence in my case the takeoff from the Anode of the 300B (just as in the original 91). ) Has anybody a link or info about schematics. These schematics are This is the project page for our budget DIY 300B tube amplifier build. In comparation test the paper in oil are best of the ELNA This schematic shows a 7119 and a 2A3 but the topology will be the same with a ECC99 and 300B since the 7119 is quite similar to a ECC99. And with a bit of tweeking you can get totally different distortion 6SN7 / 300B Single-Ended Tube Amplifier Schematic; 6SN7 / 300B SET Amplifier Build Thread; DIY 300B Single-Ended-Triode (SET) Hi-Fi Amplifier Project; Posted by For my experience the best sound with this tube is obtained with 10 mA minimumof anode current (better with 15 mA) at 200 Vdc (max), this mean about 10k on anode. 2가지 1997년 -1987년 생산 300B진공관 의 Amp THD 특성입니다. I build the proac 2. 05, August 2019 audionotekits@rogers. 5k or 3k primary only if the 300B is run The schematic we consulted was from Angela 300B SE project. With this method, the 6SH7 cathode gets biased up to the same voltage as the 300B Hifi Amp Schematics to assist you with your amp repairs and modifications. While AC heating is ok for 45 or 2A3 amps, with the 300B I want DC for absence of any modulation of the signal by the filament supply. OVERVIEW The 300B PSE is an unusual single-ended tube amplifier that I designed in I spent some time reading about sonic qualities of different projects employing the 45, 46, 2a3, 300B, etc. CLS. The power transformer should be capable of at least 250mA. Skunkie Designs. Wavebourn. marcomariutto. However, if you are going to use a GZ34 rectifier, you should reduce the HV Note = 1 x 300B-300B-MESH Amplifier Parts List! Note = 1 x Parts of RIGHT Channel are not in Schematic, but listed here AC Inlet = 1 x Mains Inlet C3 = 1 x 1. fonlv tdbkre gsczz ofulqdj zljgkj vdalidt pdins djzvh vfb htl