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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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6p45s_push-pull_class-A_amplifier.jpg
6p45s_push-pull_class-A_amplifier.jpg6p45s tube push-pull class-A amplifier2075 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.
Oct 29, 2011
Don_SE_300B_Tube_Amp.jpg
Don_SE_300B_Tube_Amp.jpgDon's single-ended 300B amplifier2290 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
Oct 20, 2011
Oatley_Electronics_K303_JFET_RIAA_Preamp_Kit.jpg
Oatley_Electronics_K303_JFET_RIAA_Preamp_Kit.jpgOatley K303 JFET RIAA Preamplifier Kit3700 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
Oct 05, 2011
Pass_Aleph_4_DIY_Amp_Project.jpg
Pass_Aleph_4_DIY_Amp_Project.jpgVariant of the Aleph 4, a true 100W Class-A amplifier4883 viewsBuilt on a budget of less than £200 (mostly E-Bay). It generates some 400W of heat so the heatsinking is massive as are the power supplies. It uses 24 x IRFP244 MOS-FETs which are closely matched into groups of 6. This is the most exhaustive part of the build. Other than that the design is incredibly simple. PCBs are available from www.kk-pcb.com, although my article at diyAudio.com details the process and patterns that I used for my own build.

In the guise that you see in the photo, this amplifier runs at an internal temperature of 45 degrees C on a warm British Summer day, which is well below the 70-80 degrees that Nelson himself allows for his commercial products. The sound quality is simply STUNNING. I’m running an Arcam CD36 / Pumpkin-Shuntky Pre-amp / Passive Attenuator / B&W DM633 with Chord Chorus Silver Interconnects. The bass slam is accurate and endless, the sound stage perfect and the midrange just sweet as a nut. This replaced my A700, itself a clone of a Mark Levinson design, and absolutely knocks the ML into the ground.

The full project build can be seen at http://www.diyaudio.com/forums/pass-labs/172276-aleph-4-strickly-diy-project-build.html

Andy Freestone
Sep 29, 2011
dual_channel_2sk1058_2sj162_Mosfet_Power_Amplifier.jpg
dual_channel_2sk1058_2sj162_Mosfet_Power_Amplifier.jpgDual Channel 2sk1058 2sj162 Mosfet Power Amp4668 viewsThis is a dual channel 2sk1058 / 2sj162 mosfet power amplifier, built to be used a main L+R amplifier for my system. I had the amplifier tested after construction to ensure it was within rated specs - each channel is 200W (8 ohm) / 320w (4 ohm) @ 0.003% THD. I have designed a remote turn-on circuit to integrate with my receiver. Each channel has its own power supply with soft start on the line side of toroidal transformers. Cooling is achieved by tunnel heatsink assembly and a PWM fan controller. At start-up fan speed is 30%. Small thermistors are attached to the inside of the heatsinks to monitor temperature. Inputs are electronically balanced.

Ashley Webber
Brisbane , Australia
Sep 12, 2011
Ion_DIY_2-Way_TMM_Tower_Speaker.jpg
Ion_DIY_2-Way_TMM_Tower_Speaker.jpgIon - DIY 2-Way TMM Tower Loudspeaker5894 viewsThe Ion tower loudspeaker project is Adam's latest diy speaker project. The Ion is a 2-way speaker in a TMM configuration. A Tang Band 25-1372SC 1" inverted titanium dome tweeter is used along with a pair of Audax HM170CO 6" woven carbon fiber woofers.

The Ion speaker project will be a very challenging build but Adam notes that it comes with a huge payoff! The Ion tower speakers have quickly become Adam's favorite loudspeakers.

For the full project details, see the Ion - DIY 2-Way TMM Tower Speaker Project.
Sep 05, 2011
K_16LS_Tube_Amp_Kit_with_PL_Preamp_Kit.jpg
K_16LS_Tube_Amp_Kit_with_PL_Preamp_Kit.jpgK-16LS Tube Amp Kit with PL Tube Preamp6049 viewsAfter months of looking I finally decided on the S-5 Electronics K-16LS stereo tube amplifier kit together with its sister PL tube preamplifier kit. The Stereo Integrated Tube Amplifier produces up to 16W and utilizes 5670 triode and 6005 pentode tubes. The PL tube preamp kit uses a 5670 triode tube.

I ditched the supplied wood board for a larger board to accommodate the preamp. Using my IPod and a set of Celestion floorstanders (90dB) I sat back to listen. WOW - seriously loud. Bass is fantastic, treble is sharp. Mid range seems to be missing a bit but after trying different tracks I am putting this down to poor quality source MP3 via the IPod. There is a reasonable amount of hum when you take the volume up but nothing annoying.

Next step is to attempt the mods for the K-12 kits.

David - UK
Sep 04, 2011
Super_Simple_Single_Stage_Tube_Preamp.jpg
Super_Simple_Single_Stage_Tube_Preamp.jpg4S “The Black” Tube Preamp1892 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.



Aug 19, 2011
Lowther_DX3_Open_Baffle_Speaker.jpg
Lowther_DX3_Open_Baffle_Speaker.jpgLowther DX3 Open Baffle Speakers6481 viewsBaffle height: 56", Baffle width: 25", 20 mm marine plywood
Baffle sloped 10° to the rear to time-align the drivers.
Fane POP100 18": centre 13" from floor.
Lowther DX3 8": 34" from floor, offset 3" from centre line.
Tweeter 2": upward firing from the top of the baffle.

Acoustic shelf: 26" from floor, 9" wide and 6" deep, centre aligned with the Lowther.
Bass box sides: 10" deep at the bottom, 5" deep at top, 26" height.
Bass port shelf: fitted across the centre of the bass speaker.

Crossover:
6dB per octave
Bass turn-over frequency 120 Hz
Lowther roll-off frequency 240 Hz (high frequencies not rolled off)
Tweeter roll-off frequency 6,000 Hz 12dB per octave

The sound has the typical Lowther wide open mid-range, quick and revealing, even with an old, low powered solid state amp. Usually Lowthers are expected to be in horns, but on a big open baffle, they just fill the room and work just as well.

electric triode (Australia)
www.amplifiers.com.au
Aug 15, 2011
Stereo_and_Seas_FA22RCZ_in_Open_Speaker_Enclosure.jpg
Stereo_and_Seas_FA22RCZ_in_Open_Speaker_Enclosure.jpgSeas FA22RCZ Fullrange Speakers4938 viewsShown in the photo is my hi-fi stereo setup with and new pair of open cabinet speaker which I built. The diy speakers use a single Seas FA22RCZ driver per cabinet. The Seas FA22RCZ is a 200 mm (8") diameter fullrange driver with a sensitivity of about 94dB. The cabinet has an open bottom, see the Seas FA22RCZ Fullrange in Open Speaker Cabinet photo for more details.

The sound is very clean, open and free of compression artifacts, similar to open baffle speakers. Nevertheless, it has a satisfying bass depth.

See my blog for more information. It is written in German but you can use the Google translate tool on the right side of the page to translate.

Kind regards,
Carsten Bussler from Germany
Aug 14, 2011
Seas_FA22RCZ_in_Open_Speaker_Cabinet.jpg
Seas_FA22RCZ_in_Open_Speaker_Cabinet.jpgSeas FA22RCZ Fullrange in Open Speaker Cabinet7289 viewsThis is a "open cabinet" speaker that uses a Seas FA22RCZ driver (200 mm (8") fullrange). As you can see, the cabinet is open as it has no bottom. The speaker system impedance measures like a poorly adjusted bass reflex box, while the frequency response measures similar to that of a closed (sealed) cabinet. There is no filter network used with the Seas FA22RCZ driver.

The sound is very clean, open and free of compression artifacts, similar to open baffle speakers. Nevertheless, it has a satisfying bass depth.

See my blog for more information. It is written in German but you can use the Google translate tool on the right side of the page.

Kind regards,
Carsten Bussler from Germany
Aug 14, 2011
12AU7_Super_Simple_Single_Stage_284S29_Tube_Preamplifier.jpg
12AU7_Super_Simple_Single_Stage_284S29_Tube_Preamplifier.jpgSuper Simple Single Stage (4S) 12AU7 Tube Preamplifier2033 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/
Jul 23, 2011
B2BO_ICEPower_1000ASP_modules_Par-Metal_Case.jpg
B2BO_ICEPower_1000ASP_modules_Par-Metal_Case.jpgB&O ICEPower 1000ASP modules4559 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
Jul 22, 2011
B2BO_ICEPower_1000ASP_modules_.jpg
B2BO_ICEPower_1000ASP_modules_.jpgICEPower 1000ASP modules in Par-Metal Enclosure3650 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
Jul 22, 2011
Par-Metal_Case_ICEPower_1000ASP_modules.jpg
Par-Metal_Case_ICEPower_1000ASP_modules.jpgPar-Metal Case with B&O ICEPower 1000ASP modules3401 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
Jul 22, 2011
Philips_EL6431_Amplifier.jpg
Philips_EL6431_Amplifier.jpgPhilips EL6431 Amplifier2288 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)
Jul 18, 2011
Philips_EL6431_Amplifier_Guitar_Amp.jpg
Philips_EL6431_Amplifier_Guitar_Amp.jpgPhilips EL6431 Guitar Amplifier Rebuild1806 viewsThis vintage Philips amp uses 4 x EL34/6CA7 tubes to obtain an output power of around 120 watts into an 8 ohm speaker. The supply voltage on this amplifier is 825 volts! I managed to rebuild and convert the Philips EL6431 into an instrument amplifier that I can hook my bass up to as well as play music.

There is more information and photographs on my rebuild in the 120 watt Philips EL6431 Tube Amp thread on the forum.

Alan (Canada)
Jul 18, 2011
6CA7_Tubes_in_Philips_EL6431_Amplifier.jpg
6CA7_Tubes_in_Philips_EL6431_Amplifier.jpg6CA7 Tubes in a rebuilt Philips EL6431 Amp1872 viewsThe four 6CA7 (EL34) output tubes of the Philips EL6431 amplifier. See the other photos in the gallery and there is also more information and photographs in the 120 watt Philips EL6431 (EL34/6CA7) Tube Amplifier thread on the forum.

Alan (Canada)
Jul 18, 2011
SE_807_Tube_Amplifier.jpg
SE_807_Tube_Amplifier.jpgSE 807 Tube Amplifier2382 viewsI send to you a picture of my 807 "Oldschool" tube amp. It's Homebrew Audio made in Germany.

In the first stage I used a EBC91 (6AV6), followed by an Russian 6H8C (6SN7) that works in SRPP configuration. Next is the 807 tube in SE. A special gimmick is the EM83 magic eye with to sections, one for each channel.

Description is published on my site www.audioelektronik-shop.de
Jul 06, 2011
Push-Pull_6L6_Tube_Amplifier.jpg
Push-Pull_6L6_Tube_Amplifier.jpgPush-Pull 6L6 Tube Amplifier2354 viewsMy DIY 6L6 tube amplifier. The output tubes are 6L6 which are driven by a pair or 12AX7. The indicator tube is an EM80. See the other photos.

Panagiotis Gavriil (Greece)

See the DIY Audio Schematics page for more 6L6 circuits.
Jul 04, 2011
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