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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_300B_Tube_Amp.jpg
Don_SE_300B_Tube_Amp.jpgDon's single-ended 300B amplifier2203 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
OddWatt-KT77-Push-Pull-Tube-Amp-Kit.jpg
OddWatt-KT77-Push-Pull-Tube-Amp-Kit.jpgOddWatt / OddBlocks KT77 Push-Pull Tube Amp Kit2202 viewsA photograph of a finished OddWatt / OddBlock KT77 Push-Pull Tube Amplifier Kit. The KT77 tube amp kit is available from OddWattAudio.com. The kit comes with a NOS JAN Philips Branded 5751 (US made) and new production JJ branded KT77 tubes (Russian made).

Complete instructions to build a similar DIY version of the amp are available on the Oddwatt 225 - 6SL7 SRPP / KT77 SIPP (Push-Pull) Tube Amplifier project page.
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IMG_2685.JPGDIY 50EH5 / 25EH5 TUbe Amplifier in the dark2193 viewsHere we have a picture of my 50EH5 / 25EH5 amp in the dark, along side with my Mini 12AU7 preamp.
PinotAssembleIISS.jpg
PinotAssembleIISS.jpg6AS7 SET amplifier with JAN 5R4 rectifier tube2182 viewsThis compact amp is based on an 6AS7 (dual triode), JAN 5R4 (both coke bottle) and 12AX7 driver tube. The top plated is sprayed to match the Edcor OPTs (1.7k/8ohm). The base is solid Mirbeu. Power transformer is Hammond and so is the choke. Component-2-component wiring with no PCB. Silver wire connects gold RCAs to the driver tube. Jensen (0.22uf 630V) copper paper and oil caps join the driver and power stages. The 6AS7 are pushed to 13W dissipation. Bass is heavy and extended, mids and treble highly detailed and sound stage very deep and defined. An extremely good looking and great sounding amp.

Additional information is available in the 6AS7 tube amp from layout to listening forum thread.
SE-807-Tube-Amp.jpg
SE-807-Tube-Amp.jpgSingle-Ended (SE) 807 Tube Amplifier2171 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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Jan6814HPAmpIISmall.jpgJAN6418 portable Triode Headphone Amp MkII2156 viewsThis is a straight build of the oatley electronics sub-mini headphone driver and preamp. In other builds where the basic cct. brd. is used as a preamp the passive components are upgraded and the PT2308, headphone driver chip, though very good, has been upgraded. Not here. This build uses the stock components that came with the kit. See the JAN6418 Valve (Tube) Preamplifier / Headphone Amp Kit project page for more information and other build variations..
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Voxativ-Ampeggio-Back-Loaded-Horn-Speaker.jpgVoxativ Ampeggio Back Loaded Horn Speaker2154 viewsThe Voxativ Ampeggio Back Loaded Horn Speaker on display at the 2011 Salon Son & Image show.

The Ampeggio uses the Voxativ AC-3X and the sensitivity is 101 dB / 1w / 1m.

For more information see the Voxativ Ampeggio Horn Speakers - SSI 2011 show report.
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SE-EL34-Signature.jpgEL34 Signature - SE - Mark2152 viewsThis amp is my new EL34 the "retro-34UL", Signature EL34 amp. Valve compliment is NOS Svetlana EL34 and Svetlana 6N1P. Edcor GXSE 6 ohm ultra-linear audio output transformers, the 10H choke and power transformer are Hammond. Inter-stage capacitors are Jensen copper, paper and oil with pure silver leads. Biploar capacitors are used as bypass caps on the EL34 with ceramic sockets to hold the audio tubes. The rectifier valve is a Golden Dragon 5U4. The audio output transformers are rubber mounted. The top plate of the amplifier chassis is ABS plastic and base is Australian Spotted Gum (oiled). Feet are filled with lead sinkers and rubber glue, silver solder and silver plated wire used throughout the build. The circuit topology is Single-Ended with Ultra-Linear operation.

Mark Houston – retro-thermionic
Oatley-Electronics-K272B-prototype.jpg
Oatley-Electronics-K272B-prototype.jpgOatley Electronics K272B prototype2148 viewsSoon to be released Oatley Electronics K272B prototype. I recently made two CMoy style, OPA2134 based, HP amps but now prefer the better sounding, harmonically rich, K272B build. Two 9V batteries are used in parallel to prolong battery life and switching phone jacks, power switch and “on” LED ensures it is difficult to accidentally leave the amp on. The enclosure is impact resistant ABS which is heavy Al foil lined. Volume control is via your player and the “6418-B” will drive low impedance phones. Where the CMoy style, chip based, HP amps are clean, clear, bright and clinical, the “6418-B” has a much richer, more harmonically complex sound and a smoother all over delivery. Really it all gets down to taste. I would recommend building the K272B when released around early February 2013. I suggest you upgrade the Oatley passive parts and chip socket to better quality parts.

For more info, see the
Oatley K272B JAN6418 headphone amp and preamp thread in the forum.

Mark Houston – retro-thermionic

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6v6amp.jpg6V6 SE Tube Amplifier2142 viewsA small 2 tube amplifier with a 6V6 tube used for the output and a 6N7 general-purpose double triode used as pre amp tube. For full details see http://diy-rbt2.tripod.com
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la2a.JPGteletronics la2a DYI clone2140 viewsThis a studio compressor / limiter using a opto-coupler clone. Parts are original NOS UTC transformers and opto with NOS tubes and Sovtek with Hammond power transformer.
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6V6-Lacewood-Amplifier.jpg6V6 Lacewood Amp2140 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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amp_5881.jpgStereo Tube Amplifier with 5881 or 6L6 tubes2136 viewsStereo tube amplifier for either 5881 or 6L6 type vacuum tubes. The amplifier is class A and single ended. For more details about this tube amplifier see: http:/diy-rbt4.tripod.com/ (Portuguese)
KiSharnS.jpg
KiSharnS.jpgretro-thermionic Pinot "KiSharn" SET 6AS72135 viewsThough only a small difference between this photo and the last the Pinot "KiSharn" continues to impress and compete well against commercial amplifiers costing AU$5K. I am now running it with SED Wing “C” tubes which look and sound very close to the United Electronics tubes it started with. An audibly impressive amp which belies its functional simplicity.
Push-Pull-6F6S-286F629-Tube-Amp-with-ECC82-driver.jpg
Push-Pull-6F6S-286F629-Tube-Amp-with-ECC82-driver.jpgPush-pull 6F6S (6F6) Tube Amplifier with EСС82 input2129 viewsPush-pull 6F6S (6F6) amplifier. The input stage is an EСС82 with a large anode. The amplifier has been built into an old HP 5.25" floppy drive (fantastic steel!!!).

The input stage is made by Williamson, after the phase shifter with a split load and paper-in-oil capacitors. Displacement of the output stage is automatic, inclusion of a pure pentode. The amplifier operates in pure class-A. The output stage can be used with 6P6S and 6V6 tubes without any changes. There is no feedback used in this amp. The cathode resistor of preamp halves EСС82 are NOT capacitor shunted. The input connectors are Amphenol BNC and the output contacts are from an old laboratory equipment HP.

With best regards,
Rakhmanov Ilya (Рахманов Илья), Moscow, Russia.
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Push-Pull__Amplifier_6L6_Tube_Glow.jpgTube Glow - Push-Pull 6L6 Tube Amplifier2124 viewsThe glowing tubes of my 6L6 amplifier. The large tubes are the 6L6 output tubes and the smaller tubes are the 12AX7 driver tubes. The bright tube in the middle is an EM80. See the other photos of my 6L6 amp.

Panagiotis Gavriil (Greece)

See the DIY Audio Schematics page for more 6L6 amplifier schematics.
TDA7294-chipamp-6N3-tube-input.jpg
TDA7294-chipamp-6N3-tube-input.jpgTDA7294 Chip Amplifer with 6N3 Tube input2116 viewsFrom a $48 printed circuit board and a bag of parts (eBay) I fashioned this very functional looking 80W amplifier. The parts include a 6N3 valve (preamp stage), two TDA7294 high performance power chips and all the parts required to populate the circuit board. You have to source the chassis, heatsinks and connectors yourself and that's where the expense starts.

The amplifier has been constructed in attractive charcoal black 2U 19" rack enclosure. Three sets of switchable RCAs on the back and 4 oz volume knob and Alps pot to control loudness. Speaker protection is included on the PCB and there is a delay (anti-thump) complete with flashing LED before the amp is ready for use. Very clean sound, holographic presentation.

For more details and impressions see the Chips and Tube - 6N3 and TDA7294 integrated amp thread.

Mark Houston – retro-thermionic
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DSC04201.JPGKT88 (Genalex) Rackmount Build (Bruce's OddWatt Design)2112 viewsI am glad I built these; every #$%@!ing day. Wow. You need a project, yep, this is it.

KT88 Push-Pull Mono Block OddWatt Amplifier Project
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Listening-Room-Nikola-Azazello.jpgNikola's (Azazello) Tube Listening Room2103 viewsPhotograph of my tube amplifier in my listening room.

From left to right on the shelf:
SE 6Ф3П
SE 2A3 RCA
OTL 6AS7
EL11 Telefunken
PP 6П3С (variant of Leibowitz circuit)

From left to right on the floor:
PP 6005 - variant Leibowitz
SE 300B JJ
SE 6С4С
SE EL11 Tungsram
71-A-Tube-Amplifier-SE.jpg
71-A-Tube-Amplifier-SE.jpgUX-171A Tube Amplifier2102 viewsThis amplifier uses the UX-171-A tube (matched pairs) which are rare and produce only 1/2 W of output power. There are no resistors or capacitors in the audio circuit. A Hammond 124B nickel core inter-stage transformer couples to the power tube. Edcor 10W OPTs in the metal case. Bias is provided by 3 x 9V batteries and 230V by two step-down transformers wired in reverse. The rectifier tube is a very old "80". Power supply filtering is under the top plate (ply timber). The base houses the power transformers and is a 1940s wooden pot stand. The tube amplifier sounds excellent.

For more info, see the 171-A single-ended amplifier thread in the forum.

Mark Houston – retro-thermionic
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