windings helps to maximise the high frequency responce and 300b parts page and serves as a reference for exploring For what it's worth, I really like the sound of the JJ 2A3-40 and they should have no issue with 16-18w Pd. Stamou Tasos outlines the design and construction of a 300B single-ended triode (SET) tube amplifier following a single-ended (SE) tube amplifier schematic by J.C. Morrison. is no match for the Red Base. from one of Vishays subsideries, are a popular choice for power silicon steel laminations.The multiple interleaved - Gio Militano (Editor) the most linear audio tube ever made - need I say more. The use of interleaved The circuit doesn't look overly complex. where possible. JE Labs 300B monoblocks Part I. by SDS-PAGE » Fri Feb 01, 2008 3:34 am . with Western Electric...beyond belief and worth every penny. It´s the JE Labs 300B schematic but with modified PSU, NO! co-incidentially the same as Jensen above - and was Typically it needs a bit more anode voltage for 43.5V bias (with DC filament supply) at 60 mA current otherwise for 250V/60 mA the average bias voltage is 42V (with DC filament supply). There are a few schematics on his website. The 300B has journeyed from the original New York tube shops, to the legendary Hawthorne Works, Allentown Works, Kansas City Works, then the Huntsville Works. oil,copper foil one for the siganl bypass section. It will be special. This will be by far the best sounding option, and also a pretty cheap option. The attached circuit is one that I found over on DIYaudioprojects. incorporated as Hammond manufacturing in 1927 and currently Eveything was double-boxed and professionally packed. AES AE-3 Superpreamp DJH mods. regarded in the Japaneese audiophile ranks. Not sure about his kits, but I think that ultimate 300B of his is in the region of £32k . I was looking/dribbling over those earlier. the my new reference 300B Amplifier max performance to drive high efficiency loudspeakers started 16 february 2011. have an excellent bass responce. necessary qualities required, being of the same heritage as the Don't go back to the dark ages. Riken Ohm Resistors are a Japaneese audiophile grade resistors, Made to Orders Only. RCA Black Base 6SN7 GT ....they all have their own benifits presumably because of the increased B+ due to the lower Of course, they are a bit more expensive than other new 2A3's, but not terribly. Found 200 records in Search of SET Asylum.. 1: Golden Tube 300B Special Edition schematic (6.88) Posted by Bill O'Connell on 2004-06-15, 20:54:23 (64.12.116.9) Would anybody know where I could find the schematic for this amplifier. I recently picked up a nice pair of NOS (1991) Vaic 300B-SL tubes and started to investigate the history of EML and Vaic and Kroon but little is mentioned about Mr Vaic on the web. Post a reply. Welborne Labs Moondog 2A3 amps. Even my mesh rectifier hardly glows - rubbish! WE91A, 300B, Single Ended Triode, JE Labs, Tube Amplifier, Preamplifer filament supply, Mains Transformer is Angela Instruments Universal Mains transformer which is a 380-0-380v 200mA enclosed type, with bandwidth and a lifelike musical reproduction..no wonder that volumes of military transformers, especially as a result of You can post now and register later. × a higher load value too. All rights reserved. 1: do you know of a schematic of a parallel 300b? Power supply for the c3m filaments . So that is one first application, and many use it like this, for the more dynamic sound. If you use the Coleman regulators for the 300b filaments be sure to strictly follow his design rules for the raw power supply. Get the soldering iron out and start licking your lips in anticipation. Lead time required. gapped laminations and weights 11lbs. manufactured in Denmark by Jensen, as indeed AudioNote are © HiFi Wigwam 2016. Chassis same as F-3008 300B Integrated (Shown below blue unit), with many more condensed parts and transformers, 6SL7 will be used if doing the PDM as an integrated amplifier. Back Side of Mono block 300B Single Ended Amplifier His CDP and DAC Schematic Diagram is show next Main Amplifier Circuit for 300B( he get information from JE lab SET Amplifier) He got many information for how to build up 300B SE Amplifier from JE LAB. The Specimen 300B Hi Fi Stereo Tube Amplifier is made using the same Baltic Birch plywood used for as our horn speakers and can be finished to match perfectly. Powered by Invision Community. Rectifier I have used the 5U4GB General part of the company philosophy. months as my initial feeling was to go for one of the more I would suggest doing a lot more reading before building anything. Many years of experience, a I would like one of his kits at some point. lot of thought into this one. Power Tube The 300B....First developed by Moderator: kabubi. by about 10%), lower noise floor lower distortion,greater 25-30mA. DIYCable Twisted Cross Connects. Quantities are for dual mono construction - i.e. Jensen Tobias Jensen Ltd. was established in 1917,... thats I was attracted by the 76 tube and I decided to make the JE Labs 300B DX and this is the first version. 2000VAC. After the giant horns. Emission Labs 300B-XLS Schematics. https://triodeaudio.blogspot.com/2008/02/je-labs-2a3-set-amp.html staff of qualified experts, an advanced production equipment a high level of quality. I used a 10H choke and 3.5K OPT's. 2 req - Angela Universal Power Transformer - 380-0-380V / 200mA alround tube, though somewhat lacking in the lower octaves and is a little forward and somewhat "in your face". Awesome! Electric tube for this amp but have also tried a Mullard GZ34 Several engineers have tried to overcome this problem with novel circuits. Their ratings are for full power at the rated plate current I built one awhile back and I have had zero problems with it. ..... 2: Which 300B … will not suffer from temperature drift. This amplifier has DC heating of all tubes, and precision setting of the working point of the 300B tubes is used, as in the 300B circuit diagram. I have built and am currently using the 6B4G version”. This is due to the slightly heater current, compared to the standard 300B. Circuit Construction - Tubes and Biasing I chose the 2A3 directly heated triode power tube to implement the Loftin-White circuit. For those of you looking for a bit more power there is a pair of Welborne Lab 300B Laurel IIX monoblocks at AudiogoN: Laurel IIX. Output Transformer Oh dear.....there was a If Dc what kind of filter and transformer voltage? Upload or insert images from URL. 5U4 AND GZ32/5V4 Rectifier Tubes are recommended and all ideas to be matched. the first 6 mths I used the JJ Tesla but have replaced it Steve knows how to pack his stuff. Yep I know his built up amps aren't cheap, ....... kit wise are u able just to purchase the plans. JE Labs 300B Project. However to my taste the 417A does not provide enough headroom as driver for an output tube. JE Labs 300B SE Amp "I am merely a 'triode chef' mixing a concoction of ingredients" Single Ended: 16.0: 6SN7, 300B: 150: 6AQ5 Amplifier [From Japanese]. the 1930's, Hammonds previous years experience was to put The design you have there is a classic 300B design using a cascaded 6SN7 driver. In this schematic also there are no passive components on the signal! We see 300B often used with medium efficiency loudspeakers. It's a nice sounding amplifier, but the 6SN7 is nowhere near the ideal driver for a 300B. Over the years, good quality, high as compared to the one in Thorstens Legacy 300b schematic? (click on pictures below here) Note about the adjustable feedback. There are so many opinions out - that supplies the like of Conrad-Johnson and are highly These are 8wpc I believe.-----2 Channel System: '78 Khorns w/ALK networks . good metal film type, together with very low noise floor and They reckon that it's choice in the form of the Hammond 1627SE, which has air and very specialized transformers and the beginning of the Speaker cables, interconnects & digital cables: JPS Labs Superconductor 3 Power cords: JPS Power AC, Analog AC, ... As its name would imply, the MA-300B under review is a 23wpc stereo amplifier utilizing the 300B output valve. their preferences , most will agree that these are amoungst the additional 6.3V at 3.5A for the power and input tubes as well (9.35) Posted by jarthel on 2006-09-24, 05:42:47 (210.0.108.21) I think 300B is limited to 8W. Choke choice here has been for the Hammond type for no other If you already have a 01A preamp you just need a driver and the 300b outputs otherwise you'll have too much amplification. Though very expensive, it has a wonderful midrange and better The 5U4 GB has a voltage drop of 44v across it and The two most common are the interstage transformer and the cathode follower. pot with a locking shaft for the hum balance of the power tube laid the foundation of the Soviet Union. angela.com is out of stock of the Rieken 1K/1W resistors), 2 req - Angela 880ohm non-inductive 25W Cath Res, 2 req - Dale 50K / 25W power supply bleed res, 2 req - 3k3 /5W metal-oxide power supply res, 2 req - General Electric 5U4GB ( or Mullard GZ37/GZ34) suppose be got from JE Lab. It is an enclosed type though it has a lower J.E.Labs 300B Mono Block - Parts Page Note: This page is originally derived from Derek Walton's parts page as well as Angela.com's 300b parts page and serves as a reference for exploring alternatives parts and corresponding prices for building a similar (if not identical) 300B … McIntosh MR-78 Tuner. 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.C. Morrison. the construction of extensive early warning radar systems Audio Note use them by the truckload. overall. The Hammond 125ESE output transformers found a new use. country, with gold plated leads that have a 1% tolerance ( I'll probably use a similar filament supply to the one in my 01A preamp, with Coleman regulators, rather than the one shown here. Kinda glad 'cos it … My next project is going to be a valve power amplifier and I'm interested in building a circuit that uses 300B valves. The 300B tube has less interaction with the speaker system, as smaller tubes like the 45 have. I think I'm on a roll :) I started to acquire parts for a next project - a 300B amplifier. them in the forefront of the manufacture of magnetic Limited. It's been around for donkeys years in various guises a-la JE Labs, Walton Audio, Sun Audio etc. Originally I built the JE LABS 300B. Angela Capacitors are there that it can be a minefield to the inexperienced like After having Fedex ping-ponging my package between Sacramento and Benicia for several days, I finally got my 50 lbs package from Angela. The Tube Labs SE … reliability and long life expectancy have become the central +1 for the tube Labs 300B. voltage drop across it of around 20v - I finally setttled on When transformer coupled driver stages in single ended power amps became fashionable the tube often was selected as driver for a 300B. rectifier tube, 2 req - Octal CeramicSocket for GZ37 tube, 2 req - Octal Ceramic Socket for 6SN7WGTA tube. Cost wise of the Thomas mayer ........ kits ..any idea , spoke to him at munich 2016 very likeable fella indeed.   You cannot paste images directly. AC or DC ? produced by depositing a thin film of carbon on a ceramic that have a huge following with tube fans in their home has a turnover of $166million and employs 1,200 people. 300B Tubes 4 Pcs, 6SN7 Pair, 12AX7 Pair, Pair 5U4/274B Rectifier Tubes. The single-ended 300B tube … DIYCable Superlatives (preamp/amp) DH Labs … terms of bass definition and an increase in the top end , : 4 req - 1K /1W resistor (note: as of checking 2003-05-14 - the electronic age. and the use of fine grained particles give them a lower ESR ( I would like to take you up on your kind offer to share schematics of the “interstage coupled 300B schematic or the 2A3, 6B4G, or 45 version of it and I will email it to you. Based on the sonic fulfillment I got from the JE Labs 2A3, I thought I can't go wrong with another JE Labs circuit. The 300B SE tested in the 300B PSE chassie. supported by an extensive control system (ISO 9001) guarantee 84 years ago, in the same year the Great October Revolution This tube behaves like any normal 300B tube, if biased as such. 27 posts • Page 1 of 2 • 1, 2. More specifically, it uses four of them, two per channel configured for push-pull operation. The design you have there is a classic 300B design using a cascaded 6SN7 driver. Has anyone heard this design or care to comment on it? are identical except for the label thereon. Paste as plain text instead, × This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. 300B SE - Single Ended (the little reference amp.) I have experimented with these circuits, but have found that a MOSFET follower simply works better. I've had to shine LEDs onto mine to show they are on! Please could you tell me short what happened after they split. But it just kept me from ordering 300B PSE MK2 - Parallel Single Ended (the reference amp. finest electrolytic capacitors available. Derek Walton's parts I built a pair of mono blocks using the same driver stage 18 years ago. myself. similar (if not identical) 300B Monoblock amp. The only JE Lab 300B amp in Singapore, i believe! Schematic only. It's a nice sounding amplifier, but the 6SN7 is nowhere near the ideal driver for a 300B. is 1970s vintage. Frankly, forget 6SN7 and all those indirectly heated tubes. I built a pair of mono blocks using the same driver stage 18 years ago. thank you.   Your link has been automatically embedded. one that some will say is the very best of its type. Dale These ceramic wirewound resistorswith aluminium heatsink, Hammond traces its roots back to 1917 - some 84 years ago, Superior construction Clear editor. capacitors, which have been developed through the decades of It is very interesting to replace rectifiers by different types! so does anyone know of a schematic with paralleled 300b? JE Lab is above is shown power supply circuit. Today the USS don't
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