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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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DIY-Seas-Granite-Speakers.jpg
DIY-Seas-Granite-Speakers.jpgGranite Speakers with Seas Drivers5213 viewsThese unique looking speakers are housed in a bass reflex enclosure constructed out of black granite. The enclosure size is 15L and tuned to 45 Hz. The drivers, G17REX/P woofer and Seas 27 TFFC tweeter are from Seas. The crossover is second order at 2500 Hz. See the project page: DIY Granite Loudspeakers with Seas Drivers for more information.Jan 08, 2009
DIY-Granite-Speakers.jpg
DIY-Granite-Speakers.jpgDIY Granite Speakers5174 viewsThese are granite speakers that Radoslav from Slovakia has put together. The bookshelf sized loudspeaker uses the Seas G17REX/P woofer and Seas 27 TFFC tweeter with a 2nd order XO at 2500 Hz.

For full details, see the DIY Seas Granite Speaker project page.
Jan 08, 2009
mag02.jpg
mag02.jpgMagnavox 93 Series Tube Amp Rebuild2627 viewsThe cloaked and stunning 93 Magnavox 93 Series Tube Amp ready for service! For more information, see the Magnavox Stereo tube amplifier model 9304-20 rebuild thread on the forum.Jan 07, 2009
KT88-Push-Pull-Tube-Amp-Front.jpg
KT88-Push-Pull-Tube-Amp-Front.jpgKT88 Push Pull Tube Amplifier (Top)3388 viewsTop view of the KT88 push-pull tube amplifier. The amplifier is based on Bruce's KT88 Push-Pull Tube Amp but uses new production KT88 Genalex Gold Lion tubes from Tube Depot. More information and photographs for this build are available in this KT88 Push-Pull Tube Amp message thread.Jan 05, 2009
KT88-Push-Pull-Tube-Amp-Bottom.jpg
KT88-Push-Pull-Tube-Amp-Bottom.jpgKT88 Push Pull Tube Amplifier (Bottom)3332 viewsUnderside view of KT88 Tube Amplifier. The amplifier is based on Bruce's OD 225 but uses KT88 output tubes for more power. See this thread for more information and photographs.Jan 05, 2009
EF86-EL84-Parafeed-Tube-Amplifier.jpg
EF86-EL84-Parafeed-Tube-Amplifier.jpgEF86 / EL84 Parafeed Tube Amplifier3217 viewsEF86 driver and EL84 output Parafeed Tube Amplifier. Uses a 230V primary, 9V secondary Talema 30VA mains toroidal transformer as the audio output transformer (OPT). For more details and a schematic, see the EF86 / EL84 Parafeed amp thread.Jan 05, 2009
6P15-EL84-SV83-Tube-Amp.jpg
6P15-EL84-SV83-Tube-Amp.jpgEL84 / SV83 / 6P15 Single-Ended (SE) Tube Amp3134 viewsSingle-Ended Tube Amp using 6P15 output tubes (similar to the EL84 or SV83). 5963 signal tube and 5Y3 rectifier tube. The output transformers are inside the chassis.Dec 20, 2008
6P15-Tube-Amp.jpg
6P15-Tube-Amp.jpg6P15 Tube Amplifier (also EL84 or SV83)3036 viewsThe tubes I'm using are a 5Y3 rectifier, Soviet military 6P15 output tubes (similar to the EL84 or SV83 either will work) and a 5963 signal tube The output transformers are inside the chassis and are vintage ones salvaged from a 1960's console amp. The power transformer and power supply choke are also salvaged.

The two volume controls are the 100K Single Series Single Shunt Stepped Attenuator (S5 Attenuator). They are the -20 to -50 dB versions which is fine with my Loth-X speakers but would be too restrictive with less efficient speakers.
Dec 20, 2008
K-16LS-Tube-Amplifier-Kit-Hammond-OPT.jpg
K-16LS-Tube-Amplifier-Kit-Hammond-OPT.jpgK-16LS Tube Amp Kit with Hammond OPT6361 viewsAndy's son put also together a K-16LS Tube amplifier kit with the additional tone control preamp section. He used Hammond Output Transformers in place of the ones which came with the kit. See see his Andy's webpage for more photos and information.

Also, additional information about the S-5 kits is available at the Tube Amplifier Kit page.
Dec 19, 2008
K-16LS-Tube-Amplifier-Kit-Modifications.jpg
K-16LS-Tube-Amplifier-Kit-Modifications.jpgK-16LS Tube Amplifier Kit with Modifications4912 viewsHere are a couple of photos of Andy's K-16LS Tube Amplifier Kit. The enclosure is a Hammond 16" x 8" x 3" aluminum chassis. The original audio output transformers are 5K6 OPT's from an ELLA amplifier. For more information about Andy's build and modifications, see his webpage.

More information about these kits is available at the S-5 Electronics Tube Amp Kit page.
Dec 19, 2008
K-16LS-Tube-Amplifier-Kit.jpg
K-16LS-Tube-Amplifier-Kit.jpgK-16LS Tube Amplifier Kit from S-5 Electroncis5240 viewsThis is a stock build of a K-16LS Tube Amplifier Kit available from S-5 Electronics. The tube amp kit comes with a pine board so you will need to find a suitable enclosure you can fit the amp in or you can build you own enclosure.

See the DIY Tube Amplifier Kits page for more information about the various S-5 Electronics kits.
Dec 19, 2008
CSS-FR125SR-Fullrange-Speaker-Drivers.jpg
CSS-FR125SR-Fullrange-Speaker-Drivers.jpgCSS FR125SR Fullrange Speaker Drivers3759 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.Dec 19, 2008
5-channel-LM3875-chipamp.jpg
5-channel-LM3875-chipamp.jpg5 Channel LM3875 ChipAmp / Gainclone Amplifier4347 viewsI was looking for a simple way to integrate 5.1 surround sound into a projector / PC based home theater a while back and then the idea hit me, I had just finished a 2 channel gainclone for my PC desktop with phenomenal sound. So here is my incarnation of a 5 channel gainclone. The case is custom, cherry front and back sections and plate Aluminum for sides, bottom and top. The heatsink was a leftover from an Advanced Energy RF amp. It is driven from an SB Live sound card. See the other photos.

See the gainclone amplifier pages for more chipamp ideas.
Dec 18, 2008
chipamp-gainclone-amplifier.jpg
chipamp-gainclone-amplifier.jpgDIY Chipamp / Gainclone Amplifier3276 viewsThis is the diy enclosure for my 5 channel gainclone project. The five channels are powered by an external transformer that was borrowed from an old Fisher receiver. The amplifier is It is driven directly from an external SoundBlaster Live audio card. The cost of the whole setup, was under $100.

See the gainclone page for more amplifier ideas.
Dec 18, 2008
LM3875-amplifier.jpg
LM3875-amplifier.jpgLM3875 Gainclone Chipamp on Protoboard3330 viewsEach LM3875 amplifier module (board) has its own DC rectifier that is made from high speed switching diodes. The supply capacitors are on the board. See the Point to Point LM3875 Non-Inverting Gainclone Chipamp Instructions for ideas on how to construct an amplifier like this on a protoboard or veroboard.Dec 18, 2008
Fostex-FX120-Fullrange-Bass-Reflex-Speaker.jpg
Fostex-FX120-Fullrange-Bass-Reflex-Speaker.jpgFostex FX120 Recommended Bass Reflex Enclosure6001 viewsHere the Fostex FX120 fullrange driver is used in the Recommended bass Reflex Enclosure design provided by Fostex. See the Fostex Recommended Bass Reflex Type Enclosure Plans for the box dimensions.Dec 18, 2008
Fostex-FE126E-Rear-Loaded-Horn-Speaker.jpg
Fostex-FE126E-Rear-Loaded-Horn-Speaker.jpgRear Loaded Horn Speaker with Fostex FE126E7937 viewsThis is a diy rear loaded horn (back loaded horn - BLH) speaker that uses the Fostex FE126E fullrange speaker driver.Dec 18, 2008
Pro-Ject-Phono-Box-SE.jpg
Pro-Ject-Phono-Box-SE.jpgPro-Ject Phono Box SE Preamplifier7226 viewsInside view a Pro-Ject Phono Box SE Preamplifier. The op-amps are two TL071CP and four JRC5137G. The power supply is regulated using 78L15 voltage regulators. Nothing stunning in the box. I like my DIY Moving Magnet Phono Preamplifier Kit better!!Dec 01, 2008
50year-old-tube-amp.jpg
50year-old-tube-amp.jpg50 year old triode tubes single ended 3.5 WPC3013 viewsThis amp uses all triode tubes in single ended configuration and thus the circuit as short and sweet as possible. The result was 3.5 watts per channel, with 0.07% distortion at 1kHz, 1 watt and not much worse at the extremes. We also did not have the deep pockets to try the more exotic transformers and coupling capacitors available. I'd like to, though, and set up my A/B switch box to see if I could discern any difference. The A/B test with myself and others paired with a high end solid state amp with 0.007% distortion, or ten times less did not reveal any discernible difference. I have a notion that some high end speakers might make the biggest difference of all. The row of LED's are a clever circuit we designed which indicate 3 decibel increments of sound pressure level (SPL). Each 3 decibel increase in loudness requires a doubling of wattage, as many of you know. These light up in sequence , e.g. 0.04 watts, 0.08, 0.16, 0.30, 0.7, and so on to 8 watts total.Dec 01, 2008
EL84-SE-Tube-Amplifier.jpg
EL84-SE-Tube-Amplifier.jpgEL84 SE Tube Amplifier Project4263 viewsThis is my Single Ended EL84 / 6BQ5 Tube Amplifier project. See my webpage for the schematic. Half of a double triode tube (ECC88 / 6DJ8 or ECC82) amplify the input signal for each the EL84 / 6BQ5 tubes. The speakers in the background are also DIY and use a single Panasonic fullrange driver.Nov 29, 2008
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