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

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CSS-FR125SR-Fullrange-Speaker-Drivers.jpg
CSS-FR125SR-Fullrange-Speaker-Drivers.jpgCSS FR125SR Fullrange Speaker Drivers3918 viewsA pair of CSS FR125SR drivers by Creative Sound Solutions. These are nice looking drivers that unfortunately have a few problems. See the CSS FR125SR fullrange driver page for more information and Thiele / Small parameter measurements.
IMG_3492.jpg
IMG_3492.jpgTesting of active crossover3909 viewsThe active crossover is using Rod Elliot's P09 design and is 24db/octave Linkwitz-Riley crossed at 3500Hz. Op amps are cheap TL072 and the sound is still great. Transients are not lost whatsoever.
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00119.jpgFinished, inside view3894 viewsEI transformer, rectifier, star ground (just above the left cap of the rectifier), LM3886...
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IMAGE_145.jpgOne valve (tube) 60W guitar amplifier3894 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!
50EH5-DIY-Tube-Amplifier.jpg
50EH5-DIY-Tube-Amplifier.jpgDIY 50EH5 Single Ended Tube Amplifier3887 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.
EL34-Push-Pull-Tube-Amp-Kit.jpg
EL34-Push-Pull-Tube-Amp-Kit.jpgMars EL34 Push-Pull Tube Amplifier Kit3874 viewsA tube kit amp available in South Africa. For more information see the EL34 Tube Amplifier Kit thread on the forum.
Oatley_Electronics_K303_JFET_RIAA_Preamp_Kit.jpg
Oatley_Electronics_K303_JFET_RIAA_Preamp_Kit.jpgOatley K303 JFET RIAA Preamplifier Kit3874 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
Blue_Velvet_Pre_Amp.jpg
Blue_Velvet_Pre_Amp.jpgThe Blue Velvet Tube Pre-Amplifier3865 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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B2BO_ICEPower_1000ASP_modules_.jpgICEPower 1000ASP modules in Par-Metal Enclosure3854 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
6s45p-300B-GU-48-Tube-Amplifier.jpg
6s45p-300B-GU-48-Tube-Amplifier.jpg6s45p / 300B / GU-48 Tube Amplifier - 125 Watts3837 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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IMG_3497.jpgQuad-channel LM3875 Gainclone3835 viewsCrammed 4 LM3875 DIY Gainclone amps into this little box using 2-tiered setup.
ZCA_1~1.jpg
ZCA_1~1.jpgRadoslav's ZCA (SE class-A mosfet amp)3830 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.
Bottlehead-Seduction-Phono-Preamp.jpg
Bottlehead-Seduction-Phono-Preamp.jpgUnderside View of Bottlehead Seduction DIY Tube Phono Preamp Kit3815 viewsThis is the inside view of the Bottlehead Seduction DIY Tube Phono Preamp Kit. All connections are point to point.
BattMMPreSmall-2.jpg
BattMMPreSmall-2.jpgMM Phono Preamp (battery powered)3810 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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00002.jpgCustom PCB3806 viewsFront of the LM3886 and power cables, the rest of the cables needed to make a star ground where much more thinner (single wire).
EL84-Push-Pull-Tube-Amp.jpg
EL84-Push-Pull-Tube-Amp.jpgEL84 Push-Pull Tube Amplifier3800 viewsThe amplifier built on the basis of the Scheme from EL84 Push-Pull Tube Amplifier.
6L6-5881-SE-Valve-Amp.jpg
6L6-5881-SE-Valve-Amp.jpgSingle-Ended (SE) 6L6 / 6L6GC / 5881 Valve Amp3797 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.
Bottlehead-Seduction-Phono-Preamp-6922-Tube.jpg
Bottlehead-Seduction-Phono-Preamp-6922-Tube.jpgBottlehead Seduction Phono Preamp with 6922 Tube3780 viewsClose up of the Electro Harmonix 6922 Tube on the Bottlehead Seduction DIY Tube Phono Preamplifier Kit.
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Twinings.JPG12AX7 Valve Preamp in Twinings Tea box3773 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.
Prada_1.jpg
Prada_1.jpgPrada OPA627 Preamplifier3751 viewsUsing my daughter's Prada phone box (heavy cardboard) I fashioned this preamplifier around the Bur Brown (high performance) OPA627AP opamp ($AU50). It is a single stage preamp and powered by four lithium 9V batteries for a PS of 18V.

The black knob is solid brass and the attenuator is an Alps Blue Velvet. Gold RCA jacks, silver wire and WBT silver solder are used throughout.
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