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 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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Don-SE-807-Tube-Amplifier.jpg
Don-SE-807-Tube-Amplifier.jpgSingle-Ended 807 Tube Amplifier3504 viewsI have stated in the past that my mate Don makes an amp a month. This month Don has completed an 807 amp based on a schematic designed by Matt from the USA and the same as I built a short time back. I took a short listen and thought it OK but a much longer review is required. Don’s iron is wound by Dyne which is near us (Melbourne, Australia) and Don’s superb enclosure bases are made by him from, once more, Australian Spotted Gum. Top plate is once more ABS and OPTs are James. This not only a smart looking amp but with some high quality passives under the bonnet and again a very neat wiring layout. In this build JJ filters caps were used. Don has another amp in the pipeline so stayed tuned. About one month from now (lol).

Mark Houston – retro-thermionic
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6C33C-SE-Amp-Don.jpgSingle-Ended 6C33CC Tube Amp with 6SL7 driver2729 viewsTake a look at Don’s new single-ended 6C33C amp. The top plate is ABS plastic, the wood base is Australian Spotted Gum. There is a power transformer for the HT supply and a toroid for the 6C33C heaters. Two chokes are used to split the HT into two seperate PS channels. This is a three stage amp with 6SL7 driver tubes. The two 6SL7 triodes are linked with a cap but the second triode drives the power tube direct. Each power tube will run up to 220mA but even at 150mA the power tranni gets real hot. Don’s work is ultra neat but I had to correct all the wiring around the 6SL7 for him to get the amp to go. It sounds absolutely fabulous. Has to be Don’s best tube amp build to date.

Mark Houston – retro-thermionic
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SE-6AS5-Pentode-Amp_.jpg6AS5 Micro-Power 1W/channel UL Amp2240 viewsA nice class-A stereo amp based on the 6AS5 pentode. The amp uses a 6CG7 driver tube to drive the output stages in UL mode. The chassis is black walnut with a strip of lacewood inlay for contrast. Power level is only 1 watt per channel calling for high sensitivity loudspeakers. The input sensitivity for full output is a little over 1v peak so this amp can be driven by just about any MP3 or CD player or even a simple line level input.

Matt Renaud
Pacific Northwest, USA

Project Thread: Micro-power UL - The Amp that Never Ends
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6V6-Lacewood-Amplifier.jpg6V6 Lacewood Amp2131 viewsThis is a 6V6 SE UL design with a 6SN7 driver stage (unbypassed cathode). Peak undistorted power is 3.2W RMS into 8Ω. Input sensitivity is 1.56v peak (1.1v rms) for full power. Designed for very quiet background, the power supply sports 15H of total inductance in two stages and a noise level of -128dBv. Hammond iron in the power supply section and Edcor output transformers.

Matt Renaud, Pacific Northwest, USA

For full details of this 6V6 tube amp, see the project page, 6V6 Lacewood Amp. Please feel free to ask questions or post comments in the 6V6-6SN7 Humless "Lacewood" Amp thread.

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_63-Fender-Reverb-Clone.jpg'63 Fender Reverb Clone2014 viewsHere is a photo of the last project I built. It is a rear view with the cover removed. It is a modernized clone of a '63 Fender Reverb. I changed a few things like using modern grounding and layout methods I went with larger filter caps a full wave bridge rectifier. I think I used a slightly nicer spring suspension system to "fly" the pan in it's shock isolation mounting. The input jack is grounded to the chassis but the other jacks are isolated. There are two transformers and one choke, all are made in USA with paper insulation. The enclosure is Maple. The sound is very true to the vintage Fender. It goes from very subtle to full-on spring/twang.

Chris A.- California, USA
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Dons-300B-Tube-Amplifier.jpgDon's Compact 300B Amplifier2033 viewsDon has build this exquisitely compact 300B on one of his fine Spotted Gum bases. He uses ABS for the top plate with no bottom plate. He doesn’t believe in them. The 300Bs and 6SN7 are Chinese made “Electron Tube” – Shuguang . All components underneath are high-end. Though Don is on a pension he always uses the best passive parts but skimps on the tubes. The rec. tube is a Golden Dragon 5U4. The horizontal power tranni, OPTs and choke are locally wound by Dyne and are expensive. The best amp I have heard of Dons is his 2A3 which I intend to re-borrow. This amp is new and may improve with time but for now both the top end and bottom end are a little crippled. Mids don’t sound fast and slightly masked. BUT this may all change with time. It does play very loud though on a large 3 way Osborn Eclipse @91db efficient.
Mark – retro-thermionic
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Push-Pull-6V6GT-6SN7GT.jpg6V6GT Push-Pull (PP) Amplifier1939 viewsThe 6V6 PP Amp is my very 1st attempt at valves and built it about 18 months ago...

Keith (Christchurch, New Zealand)
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OddWatt-225-6SL7-KT77-PP-Tube-Amp.jpgOddWatt 225 (driver 6SL7, output KT77 push-pull)1925 viewsThis is my version of the OddWatt 225 (push-pull) tube amplifier project that I built following the instruction on this website. The output power is 15W in pure class-A operation. The amplifier can be used with KT77 and 6L6GC output tubes.

I'm using the push-pull KT77 tube amplifier with my DIY Turntable (record player) which is a featured project on the website.

Nandor Szabo (Hungary)
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Scott-299-Amplifier.jpgScott 299 Amplifier Rebuild1714 viewsThis is a picture of my 299 Scott Amplifier. I made the whole enclosure case using 1/2" (13 mm) aluminum. The knobs are made of one and 1-3/8" roll aluminum. The face plate is made from a piece of stainless steel with silk screened lettering. The Scott 299 amplifier was completely re- built from the ground up and it sounds great.

Thank you,
Ken Valeo (USA)
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DIY-Dynaco-ST70-Tube-Amp.jpgDIY Dynaco ST-70 Tube Amp Rebuild1863 viewsThis ain't your father's Dynaco ST-70 amplifier. Mahogany case with toroidal power tranny.OPTs are original Dynaco 470s purchased via auction. Trannies "capped" with same wood. Features the tubes4hifi 12AU7 version of their driver board (and I woud never go back to the 12AT7 version now).
Re-issue GoldLion KT88s, Mullard 12AU7s. Fused with an IEC and on-off switch up front. Bias adjusting performed via Red Test Jacks perpendicular to holes cut for trimmers Ground/Common is Black test jack behind center driver tube. Tubes colored with LEDs.

Charlie Mooradian
USA
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SE-807-Tube-Amp.jpgSingle-Ended (SE) 807 Tube Amplifier2157 viewsAfter picking up a couple of cheap ($7) ATS25/807 tubes a volunteer from the forum, Matt, designed me an amp to go with them. This project stagnated for over a year and a half and now is finally finished. The colours are strong between the Edcor 25W OPTs and power tranni and the “Red Delicious” top plates. The bases are Australian Spotted Gum. Remote PS carries a 5H 300mA Hammond choke and 5Y3 power tube (upgraded to Golden Dragon 5U4). The amp section has all ceramic sockets and plate cap, the driver tube a Sovtek 6SN7 (has been upgraded to Shuguang 50 Year Treasure). Bipolar bypass caps are used on the 6SN7 and low ESR caps on the 807s. The amp looks smart and sounds excellent. It plays loud for its 2.7 measured Watts and has huge dynamic head room.

Mark - retro-thermionic
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parallel-6C33C-tube-power-amplifier.jpgDon's parallel 6C33C tube power amplifier2250 viewsDon the amp builder (who’s 300B amp is posted in the gallery) has put together this parallel 6C33C power amp. Though not complete it’s not hard to see this is going to be a great looking amp. With the twin power tubes the primary impedance of the OPTs can be lowered to produce greater output power. The toroidal transformer is for the heaters which draw a huge amount of current. The top plate is ABS and Don made the base and is now making bases for me. All other trannies are Dyne who a local winders (Victoria Australia). Can’t wait to hear this one. Don also has a 2A3 almost finished.

Mark Houston
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6EM7-SET-Amp-Dual-Monoblocks.jpgParis Duo - 6EM7 SET Monoblock Amps1689 viewsAfter completing a dual mono 6EM7 integrated amp, at the request of an established customer, I built these 6EM7 monoblocks. No built in preamp or attenuated this time. The chassis are 2M thick cast Al, acid etch primed and top coated with epoxy enamel high gloss paint. Only the power tranni, 5Y3 and 6EM7 stand on the top plate. The 10W Edcor OPT and Hammond 5H choke are in the chassis. Gold speaker binding posts and single RCA are on the back. Also inside is a EMI power filter and a short power cord with male IEC power socket and an RF choke connect this Paris Duo to the mains. The PS has a two stage filter: CLCRC/RC which makes this 1.8W absolutely dead quiet. Wire-wrap wire (heavily twisted) connects the RCA to the 6EM7 and OPT to speaker biding post. Silver solder is used in the amp section. Great mid-range.

Mark - retro-thermionic
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two-stage-RIAA-phono-tube-preamp.jpgTwo stage tube phono preamp with RIAA equalization1775 viewsAfter building a number of diy jFet based phono preamps, on request from a friend, I built this two stage tube phono RIAA preamp. The circuit design is from the TubeCAD Journal and is one of the simpler designs on the site. The circuit construction is contained on veroboard (perfboard) and housed in extruded aluminum enclosures from Hammond. The external PS run from a 24VAC wall wart. A step-up tranni converts this to 260V and a two stage C-R filtering ensures clean power. The heater voltage is DC. Tubes are Golden Dragon 12AX7s. Russian PIO caps are used in the inter-stage coupling/output and Sprague orange drops for the RIAA stage. With my Grado Reference MM wood body cartridge this preamp sounds divine.

Mark - retro-thermionic
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6EM7_Single_Ended_Triode_Amplifier.jpg“Paris” – 6EM7 Dual Mono Integrated Amplifier2095 viewsWhat started as a forum thread discussion (6EM7 power amp) ended in the construction of a 6EM7 (Sylvania tube) integrated triode amplifier. I used dual mono construction with two power transformers, two 5Y3 rectifier tubes and two separate power filter stages but with a shared single stage preamp. There is a single EMI/RFI power filter feeding both power supplies. Two chokes and two 15W Edcor audio output transformers are in the base of the enclosure. An Alps blue velvet pot after the preamp stage (4S Universal) controls volume to the power amp section. The colour is Sungold and the base Mirbue. The amp has a very detailed mid-range and produces about 2W.

Mark - retro-thermionic
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6p45s_push-pull_class-A_amplifier.jpg6p45s tube push-pull class-A amplifier1983 viewsHello, my name is Vitaly Gorbachevsky from Russia. In this photograph is a push-pull class-A tube amplifier that I built. The maximum output power is about 34W per channel. The vacuum tubes used are 6p45s tubes in the output stage and a and longtail 6n23p driver tube. The name for this tube amplifier project is the SILVER GLOW.

Here is a link to an article that shows how the amplifier was constructed. http://people.overclockers.ru/primrose/record2/. Note that the the text is in Russian however that are several pictures in it that will be interesting.
Don_SE_300B_Tube_Amp.jpg
Don_SE_300B_Tube_Amp.jpgDon's single-ended 300B amplifier2196 viewsThis is Don’s (a friend) 300B. It uses EH 300Bs plus a dual driver stage 6SN7. The top plate is 4mm ABS plastic. The timber base Don makes himself and are extremely elegant. Absolute first class craftsmanship. The transformers are wound locally by Dyne. Don has no formal training in electronics and doesn’t understand how the circuits work but he has no problems following a schematic. Don has also built a 6C33C SE and EL34 SE and a few others. This 300B has a big solid sound.

Mark - retro-thermionic
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Super_Simple_Single_Stage_Tube_Preamp.jpg4S “The Black” Tube Preamp1816 viewsThis the third Super Simple Single Stage (4S) Tube preamp I have built. Dubbed “The Black”. The schematic is quite different from the original. Thanks Matt. Best sounding so far and supporting a Golden Dragon 12AU7 tube. The preamp still runs from a 24VAC wall wart and same PS as the other two builds. Big bass and detailed mids.

See my post about The Black - 4S preamp MKIII for more information.



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12AU7_Super_Simple_Single_Stage_284S29_Tube_Preamplifier.jpgSuper Simple Single Stage (4S) 12AU7 Tube Preamplifier1953 viewsHere is my second attempt at the Super Simple Single Stage (4S) 12AU7 Tube Preamplifier. The internal layout is a lot neater and some values have been changed which better work with the 12AU7 tube. The sound is good but not as good as the first build. But that depends on the tube in place. The 12AU7 Golden Dragon (GD) is bright and detailed the 12AU7 CONN organ tube mellow and harmonically rich. The finish on the case is Epoxy Enamel Beaten Copper. Alps pot and black heavy weight solid brass knob. Again powered by a 24VAC wall wart. The third this has been built and a Universal 4th is too come.

I have built a number of these now and full information is available in the Super Simple Single Stage (4S) tube preamplifier thread on the forum.

Mark Houston (Australia)
http://www.retro-thermionic.blogspot.com/
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Philips_EL6431_Amplifier.jpgPhilips EL6431 Amplifier2201 viewsClose up photo a vintage Philips vacuum tube amplifier which I rebuilt. The Philips EL6431 uses four EL34/6CA7 tubes to obtain an output power of around 120 watts into an 8 ohm speaker.

For more information and photographs about my Philips EL6431 amplifier rebuild see the 120 watt Philips EL6431 Tube Amp forum thread.

Alan (Canada)
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