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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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6T9-Vacuum-Tube-Amplifier-Kit.jpg
6T9-Vacuum-Tube-Amplifier-Kit.jpg6T9 Tube Amplifier in Ultra Linear Mode3430 viewsMy second 6T9 vacuum tube amp with Edcor transformers. This time the screen grid resistor was cut away and the UL tap was used. I believe it sounds better using the UL tap. Detail in voice appears to be much richer and the sound stage more detailed than with the previous amp. The tubes once more are NOS GE and are the taller variety. For full details, see the Ultra-Linear 6T9 DIY Tube Amplifier page. Also, here is my first DIY 6T9 Vacuum Tube Amplifier Project.
LePacific-MC-PrePre.jpg
LePacific-MC-PrePre.jpgLe Pacific MC pre preamp3417 viewsHere is one of three Le Pacific MC pre preamp builds. All the construction is on veroboard (strip board). These builds have been tested with a two different cartridges with an output of 0.35mV and all work extremely well. The J-FETs are 2SK170 BL which are matched. The output capacitors are Russian mililtary PIO. The case colour is Sungold the same used on Paris. All phono preamp builds are battery powered.

Mark - retro-thermionic
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IMG_1423.JPGMaking the chassis3402 viewsBefore bending the sheet metal.
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SV101673.JPGOPA2134 Preamp II with selectable inputs3395 viewsOP amp based preamp, that provides two pairs of selectable inputs, volume and balance control and 6dB of gain. A compact cct. with the only links on the cct. brd. being silver earth links, packs a lot of performance into a solid cast aluminum case. With distortion figures as low as .00008%, solid pure silver wire throughout, WBT silver solder and each of the the two circuit boards having their own virtual +/- power supply plus additional tar and aluminum damping/shielding internally this preamp can deliver. I hope the new owner enjoys listen through it as much as I have enjoyed building it. See the DIY OPA2134 Preamplifier page for more build details.
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IMG_2675.JPG50EH5 / 25EH5 Tube Amplifier Internals3375 viewsFinally, the internals of the 50EH5 tube amp. I think I went a bit extreme on the fancy parts as I used 100uF Black Gate's and 62 ohm Riken's on the cathode bias of the tubes. As for the preamp I used more Riken's and a couple of 0.1 Mundorf plate caps. I also used a 12AT7 rather than the 12AX7, although they are interchangeable to what ever you decide. I then re-used a 500K pot as the volume control instead of the 100K (because that is what I had) and added a switch between preamp and line in.
4-channel-400W-amplifier.jpg
4-channel-400W-amplifier.jpg 4 channel, 400 W amplifier3373 viewsThis 4-channel 400 W amplifier uses Hypex UcD400HG modules together with the corresponding power supply.
The whole is mounted inside a Galaxy 330 x 230 x 80 case.
For building instructions, have a look at this project's wiki.
Two such amplifiers has been working for over 2 years in my lounge, driving Linn Komponent 110 loudspeakers which each have 4 speaker inputs.

Francois Corthay - Switzerland

Project Page: 4 channel 400 W amplifier using Hypex UcD400HG modules
Nelson-Pass-B1-Buffer-Preamp.jpg
Nelson-Pass-B1-Buffer-Preamp.jpg3361 viewsThe Pass B1 Buffer Preamp complete in Hammond Aluminum case. The B1 is a very transparent and PS tolerant preamp/ driver. Because it is a source follower some signal is lost (about 15%). But it is an excellent attenuator and offers a high impedance input and low output and is dead quiet. This build shares the same components as the DIY JFET BoZ preamp but sounds quite different.

For more information about this build see the Russian Pass B1 FET Preamp/Buffer thread on the forum.

6P15-Tube-Amp.jpg
6P15-Tube-Amp.jpg6P15 Tube Amplifier (also EL84 or SV83)3359 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.
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Dynaco-MKIII-Copper-Steam-Deux.jpgDynaco MKIII - DEUX3351 viewsHere is a photo of my latest build. I call it the DEUX.

These are Dynaco MKIII's with the VTA octal Driver upgrade. I hardwired the driver circuit to avoid using the PC boards under the hood. The bases are made from walnut, and the top plate is 1/8" copper. The bolts are 3/4" brass.

More photos and construction shots here: http://blog.coppersteam.com/steampunk-art/deux-final/

Mike Cochran
Key West, Florida. USA
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IMG_1412.JPGAluminium and mate3346 viewsThe aluminum sheets used for the dissipater and a "Mate".
"Mate" is the Argentinian equivalent of "Tea" for a British.
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TwiningsRear.JPGWooden boxed 12AX7 Tube Preamplifier3345 viewsThis is my fourth of these 12AX7 valve preamp kits in which I built it in a wooden tea box and used Cardas Capacitors. The connections to the timber box are made by a 3mm think aluminum strip.The remote power supply is hard wired to the preamp via a short cord. This preamp has brought an element of focus to my 6T9 Tube Amplifier, Fostex speakers and from early listening, greater detail across the board.
6C33C-SE-Amp-Don.jpg
6C33C-SE-Amp-Don.jpgSingle-Ended 6C33CC Tube Amp with 6SL7 driver3342 viewsTake a look at Don’s new single-ended 6C33C amp. The top plate is ABS plastic, the wood base is Australian Spotted Gum. There is a power transformer for the HT supply and a toroid for the 6C33C heaters. Two chokes are used to split the HT into two seperate PS channels. This is a three stage amp with 6SL7 driver tubes. The two 6SL7 triodes are linked with a cap but the second triode drives the power tube direct. Each power tube will run up to 220mA but even at 150mA the power tranni gets real hot. Don’s work is ultra neat but I had to correct all the wiring around the 6SL7 for him to get the amp to go. It sounds absolutely fabulous. Has to be Don’s best tube amp build to date.

Mark Houston – retro-thermionic
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furniture_014_YMax_red.jpgSET Tube Amo with 6BX7 twin triode3341 views6BX7 Single Ended Triode tube amplifier, 3 watts per channel, Transcendar audio Output Transformers, a 12 LED Watt Level "Meter", built with Poplar and Brass
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parallel-push-pull-300B-tube-monoblock-amplifier.jpgParallel push-pull 300B tube monoblock amplifiers3341 viewsParallel push-pull 300B vacuum tube monoblock amplifiers build by Rudolf Moers.

More information including schematics for this amplifier build are available here: Parallel push-pull 300B tube monoblock amplifiers.
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Jordan-JX92S-Speakers.jpgJordan JX92S Fullrange Speaker Drivers3339 viewsA pair of Jordan JX92S Fullrange Speaker Drivers.
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S-5-Electronics-K-16LS-kit-enclosure.jpg3331 viewsI'm running this stock apart from the Alps Blue volume pot which I upgraded after the original sprang a leak. I'm using quite a few components bought from: http://www.mafaudio.com/pro/propage.aspx.

There are seven LED's that light up the feet and fronts of the brushed aluminum transformer cases. The LED's are powered from a 12v mains transformer bought from Maplin in the UK. The VU meters also run from the extra transformer. The chassis is made from wood bought from the local yard. To cut the VU meter holes I used a 32mm Spade bit then used a file to open the hole up to just under 34mm. The main volume control area was drilled using a 50mm Forstner bit and the tone controls a 30mm Forstner bit. It's coated in about 5-6 coats of clear varnish and involved an awful amount of sanding.

There are more photos available in my photo library.

Luke Collings,
Wiltshire, UK
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Simple-SE-6L6GC-Tube-Amplifier-Kit.jpgSimple SE 6L6GC Tube Amplifier Kit3327 viewsTop view of the Simple SE Tube Amplifier using a PCB from tubelab.com. 6L6GC tubes and Edcor output transformers.
6N7-Tube-Preamp-Heavy-Metal.jpg
6N7-Tube-Preamp-Heavy-Metal.jpg6N7 tube preamp (Heavy Metal)3326 viewsConstruction is in a timber box. There are three switchable RCA inputs and power is supplied by an external 18V 2.2A AC power pack. Internally 255V is developed with a linear PS and regulated 12VDC for the heaters which are wired in series.

An Alps blue velvet potentiometer is fitted at the output for attenuation control with a fine solid brass knob to compliment the gold right-angle RCA jacks, name plate and ventilation holes. Wire wrap wire is used in the signal path. The power supply and amplifier are on separate circuit boards. Bitumanised heavy aluminum foil is used to line sections of the timber box for resonance control.

For more info, see the 6N7 metal tube preamp thread on the discussion forum.

Mark Houston – retro-thermionic
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Electros.jpgElectrostatic Speakers3314 viewsThese Electrostatic speakers are made by a company which does not make speakers but develops new technologies in electrostatics. The best way to demonstrate these technologies is to build speakers to showcase them. They also have developed acoustic filtering which is applied to their sub-woofers which are based around two 5" drivers firing on opposite directions.

The tall black panels have two 100W amps built in the base made from discrete components, one for the panel array and the other to drive the sub-woofer in the base. The black speakers have a RRP of $AU12,000. Small black panels on the table are $AU1000 a pair. The tall silver panels produced clear live sounding mids and highs but seriously lacked base. These were demonstrated at a GM of The Melbourne Audio Club, Victoria Australia.
50year-old-tube-amp.jpg
50year-old-tube-amp.jpg50 year old triode tubes single ended 3.5 WPC3302 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.
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