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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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IMAGE_145.jpgOne valve (tube) 60W guitar amplifier3786 viewsThis guitar amp comprises of one $1000 radio transmitter valve which runs on 700Volts. The driver cct. is on the left and is a multi-stage transistor unit. The OPT on the right was wound by the owner using a primary/secondary interlace config. and then vacuum impregnated. A fan is required at the base of the valve to stop the ceramic socket over-heating. Very loud!
12AX7-Tube-Phono-Preamplifier.jpg
12AX7-Tube-Phono-Preamplifier.jpg12AX7 Vacuum Tube Phono Preamplifier3782 viewsOk, so after buying a Sansui SR-1050C Turntable, I needed a phono preamp, so I built one.

This one uses no premium parts, but sounds great. It does have a small amount of 60Hz hum, and I plan on installing some tube shields as I know its been induced by the power transformer as the PS is completely clean. The preamp uses a pair of 12AX7 vacuum tubes.

The power supply uses a MOSFET for regulation and the preamp uses a passive RIAA equalization network.


Bernardo
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Don-SE-807-Tube-Amplifier.jpgSingle-Ended 807 Tube Amplifier3770 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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50EH5-DIY-Tube-Amplifier.jpgDIY 50EH5 Single Ended Tube Amplifier3765 viewsThis is my build of Giovanni's DIY 50EH5 Single Ended Tube Amplifier. The enclosure is a metal cookie box that has been painted black. The transformers were custom wound by a local guy.
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IMG_3497.jpgQuad-channel LM3875 Gainclone3732 viewsCrammed 4 LM3875 DIY Gainclone amps into this little box using 2-tiered setup.
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EL34-Push-Pull-Tube-Amp-Kit.jpgMars EL34 Push-Pull Tube Amplifier Kit3732 viewsA tube kit amp available in South Africa. For more information see the EL34 Tube Amplifier Kit thread on the forum.
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Blue_Velvet_Pre_Amp.jpgThe Blue Velvet Tube Pre-Amplifier3724 viewsMy second tube audio DIY project, The Blue Velvet tube Preamp by Dick Olsher.
The only changes from the original schematic is the use of a 6X5GT tube rectifier. This is an excellent preamp. The 6SN7 tubes by KENRAD gives deep lows and velvet mids - highs. Coupling caps are Mundorf Silver Oil 0.68μF.
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00002.jpgCustom PCB3718 viewsFront of the LM3886 and power cables, the rest of the cables needed to make a star ground where much more thinner (single wire).
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Oatley_Electronics_K303_JFET_RIAA_Preamp_Kit.jpgOatley K303 JFET RIAA Preamplifier Kit3712 viewsThis is the second of the Oatley Electronics K303 two stage JFET phono preamps. I have built. The first build was in a "tinny" instrument case. The preamp sounded so good that I decided to construct another but this time in a heavy cast aluminum enclosure.

The K303 RIAA preamp kit comes complete with all required parts and a selectable 120/240V power supply. The RIAA section is all passive. The PS incorporates both a voltage doubler and a capacitor multiplier. The two different JFETs have been carefully chosen for their low noise and gain characteristics.

I have chosen a flame red epoxy enamel paint and separated the preamplifier section from the PS. The preamp is dead quiet and so far is the best sounding phono preamp I have built. At AU$30 for the kit, it’s a steal.

retro-thermionic
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Bottlehead-Seduction-Phono-Preamp.jpgUnderside View of Bottlehead Seduction DIY Tube Phono Preamp Kit3701 viewsThis is the inside view of the Bottlehead Seduction DIY Tube Phono Preamp Kit. All connections are point to point.
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6s45p-300B-GU-48-Tube-Amplifier.jpg6s45p / 300B / GU-48 Tube Amplifier - 125 Watts3700 viewsA 125W DIY tube amplifier. Tube compliment is a 6s45p input tube that drives a 300B tube and followed by a GU-48 tube. See the other DIY 6s45p / 300B / GU-48 Tube Amplifier photo for a full description on the tube amp.
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BattMMPreSmall-2.jpgMM Phono Preamp (battery powered)3700 viewsMy second build of the Jaycar MM phono preamp kit is house in a sleek enclosure and runs from Three 9V lithium batteries. An Alps Blue Velvet potentiometer is topped off with a solid brass black chrome knob. The preamp is very smooth sounding and better than my earlier version which uses an AC supply and regulators on board. See the MM Phono Preamp (battery powered) - inside image for an internal sview.
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EL84-Push-Pull-Tube-Amp.jpgEL84 Push-Pull Tube Amplifier3685 viewsThe amplifier built on the basis of the Scheme from EL84 Push-Pull Tube Amplifier.
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ZCA_1~1.jpgRadoslav's ZCA (SE class-A mosfet amp)3670 viewsRadoslav's ZCA. It has a massive PS with nearly 68,000uf of filtering and a twin secondary tranni.

Schematic and details are availabe from the project page: DIY Class-A 2SK1058 MOSFET Amplifier.
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Bottlehead-Seduction-Phono-Preamp-6922-Tube.jpgBottlehead Seduction Phono Preamp with 6922 Tube3667 viewsClose up of the Electro Harmonix 6922 Tube on the Bottlehead Seduction DIY Tube Phono Preamplifier Kit.
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B2BO_ICEPower_1000ASP_modules_.jpgICEPower 1000ASP modules in Par-Metal Enclosure3665 viewsThis is a high power audio amplifier project that I recently completed. The amplifier used two B&O ICEPower 1000ASP modules. Each amplifier module is rated at 1000 Watts. The two amplifier modules are housed in a Par-Metal aluminum case. The amplifier sounds amazing with my Epos ELS303 speakers.

See the other photographs.

Ed
Detroit, MI
USA
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6L6-5881-SE-Valve-Amp.jpgSingle-Ended (SE) 6L6 / 6L6GC / 5881 Valve Amp3661 views6SJ7 or 6SD7 (pentode) driver stage. 6L6 or 5881 output stage (Sovtek 5881WXT shown). Solid state power supply, DC heaters.

OPT covers are made from copper clad board and enclosure is aluminum.

See the DIY Single-Ended (SE) 6L6 / 5881 Tube Amplifier project page for more information.
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K-12G-Tube-Ampleifier-Kit-UK.jpgK-12G Tube Amp Kit build from UK3647 viewsHi this is my new build of an S-5 Electronics K-12G tube amplifier. I'm really proud of it and hope it can inspire others.

Transformer covers, knobs, feet, phono plugs and other parts sourced from http://www.mafaudio.com/.
The main transformer case was scratched and they will send another free with my next order. I've found them very easy to deal with. The case is made of pine bought at the local merchants with a plywood top. I used only simple tools.

There are more photos available in my photo library.

Luke Collings
Wiltshire, UK
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Twinings.JPG12AX7 Valve Preamp in Twinings Tea box3630 viewsThis is the fourth 12AX7 tube based preamplifier kit I have built. A Twinings presentation tea box was used as the case (similar to my Gwado CMoy / Grado RA1 Headphone Amp) with a remote PS. Cardas caps were used, all pure silver wire, silver solder, Alps blue velvet attenuator and 4 oz brass knob. The rear has a terminal strip for all the connections and the case is lined with a tar and aluminum film. The power supply has speaker absorbing vinyl lining it to ensure the switch mode tranni remains quiet.
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6BQ5-Push-Pull-Tube-Amp.jpg6BQ5 / EL84 Push-Pull (PP) Tube Amp3624 viewsTube amplifier built on the basis of the Schematic from 6BQ5 / EL84 Push-Pull (PP) Tube Amp.
614 files on 31 page(s) 18


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