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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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apic8A.jpgTwo Buck Chuck - 50EH5 Tube Amp2614 viewsThis is a stereo tube amp that was pulled out of a Philco record player that I paid two dollars for. It uses 50EH5 tubes in single ended mode.

Similar project: Single-Ended (SE) 50EH5 Tube Amplifier
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Single-Ended-833-Tube-Amplifier-Monoblock.jpgSingle-Ended 833 Monoblock Tube Amplifier3506 viewsI have built a monoblock 833 SET tube amplifier with zero feedback and a fixed bias. The total power output 125W! Here you can find more photographs: http://img200.imageshack.us/gal.php?g=img1663t.jpg
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6N1P-5881-SE-UL-Tube-Amp.jpgSingle-Ended 5881 Tube Amp with 6N1P driver3175 viewsSingle-Ended (SE) 5881 Tube Amp operating in Ultra-Linear (UL) mode with a 6N1P driver. The amplifier is based on this KT88 SE UL Tube Amp. I constructed my own and used a couple of 5881 tubes which I got for free. I did use the 6N1P though. I over specked the power tranni which originally produce over 600V with no load and diode rectification. I eventually used the secondary centre tap, limiting resistors and a standby switch and brought B+ to 405V. The base is made of Asian Merbeau and the top plate epoxy enamel paint. Edcor XSE15-8-5K OPTs, and ceramic sockets add to the overall quality finish. The sound is clean and airy and the amp is dead quiet between tracks. It will play quite loud with efficient speakers and has no audible distortion. The sound stage fills the room and stereo image is very accurate.
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Pre5Y3.JPG5Y3 rectifier tube and Twinings Tea Box valve preamp2624 viewsI posted an image of the finished Twinings Tea Box preamp with valve rectification then suddenly remembered why I had gone down the the valve rec. path. It is because I have a well used 5Y3G in my garrison of tubes which I wanted to employ in a project. In the original version I used a 5AR4, squat cathoded, Chinese and smart. But now the full realization of the project has come to light. This is how it was always meant to be (see earlier images for the original finish).

Some audiophiles roll their rectifier tubes to fine tune their amps. With this tube in place (and based on a short listen) I feel there is greater bass weight and slightly extended depth of sound stage. But who cares, it just looks slick, the way it was always intended.
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12AX7-Tube-Preamp-5AR4-Power-Supply.jpg12AX7 Tube Preamp with 5AR4 Tube Power Supply2955 viewsTwinings Tea Box preamp with external valve rec. PS

Another Tea Box valve preamp but this time with a valve rec. remote PS. The rectifier valve is a 5AR4. The iron consists of a Hammond power transformer and 10H choke. Golden Dragon tubes are used in the 12AX7 Tube Preamp . The preamp uses silver hook-up wire, Alps Blue Velvet attenuator, brass cones and 4oz brass knob. Jupiter hand made beeswax caps are used in the amp modules and silver solder throughout. The sound stage has gained greater dimension and detail has improved over my SS preamp.
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12AX7-Tube-Phono-Preamplifier.jpg12AX7 Vacuum Tube Phono Preamplifier3823 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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TeaBoxII.JPGTea Box 12AX7 Valve Preamp II2765 viewsSee the previous photo for more detail. In this image you can see the solid brass cones, 4oz brass knob and another view of the preamp. The SMPS is contained inside making one very neat and attractive looking valve preamp. Golden Dragons replace standard 12AX7 valves.
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TeaBoxTopII.JPGTwinings Tea Box 12AX7 Valve Preamp II2626 viewsThis the second Tea Box preamp I have built. The previous 12AX7 Tea Box preamp has an external PS. This one has the PS inside the attractive timber box. Jupiter hand made beeswax caps are featured in this build. The box is lined with bituminized Aluminum foil, all silver wire and gold RCAs used throughout. WBT silver solder and an Alps blue velvet attenuator add to a quality build. The standard 12AX7s were upgraded to gold pin Golden Dragons and valve rings added. The front knob is a 4oz solid brass job the brass cones are heavy weight. The Twinings decal adds to the whole aesthetics. See the project page for more information about the 12AX7 Tube Preamp Kit.
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50EH5-Single-Ended-Tube-Amp.jpgSingle-Ended 50EH5 Tube Amp2553 viewsThis is a simple 50EH5 Single Ended Tube Amp that I built a few years back. Full details are available on the 50EH5 Single-Ended (SE) DIY Tube Amplifier Project pages.
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EL84-Push-Pull-Tube-Amplifier-OddWatt.jpgEL84 Push-Pull Tube Amp after OddWatt2794 viewsEL84 Push-Pull Tube Amplifier built following the concepts of the OddWatt EL84 Push Pull Tube Amplifier Project.
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Atwood3.JPG12AX7 Valve Preamp with Jupiter Beeswax Caps2579 viewsI have made a number of these kit two stage 12AX7 valve preamps in all sorts of enclosures. I have employed a wide variety of different caps in the signal path including, Sprague orange drops, Cardas Golden Ratio and standard metalized polypropylene. In this build I have used the Jupiter beeswax and paper caps. I have used these caps before in SS preamps and found the sound very natural and liquid. The larger components have been placed on the underside of the cct. brds.to allow the valve to project through the enclosure.
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12AX7-ECC83-Tube-Preamp.jpg12AX7 / ECC83 Tube Preamp2895 viewsHi, I have built preamp with double triode 12AX7 from your web site.

The sound of this preamp is very very nice, detailed and realistic.

Pipa (from Czech Republic )
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mag02.jpgMagnavox 93 Series Tube Amp Rebuild2688 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.
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KT88-Push-Pull-Tube-Amp-Front.jpgKT88 Push Pull Tube Amplifier (Top)3453 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.
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KT88-Push-Pull-Tube-Amp-Bottom.jpgKT88 Push Pull Tube Amplifier (Bottom)3398 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.
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EF86-EL84-Parafeed-Tube-Amplifier.jpgEF86 / EL84 Parafeed Tube Amplifier3280 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.
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6P15-EL84-SV83-Tube-Amp.jpgEL84 / SV83 / 6P15 Single-Ended (SE) Tube Amp3199 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.
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6P15-Tube-Amp.jpg6P15 Tube Amplifier (also EL84 or SV83)3100 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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50year-old-tube-amp.jpg50 year old triode tubes single ended 3.5 WPC3072 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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EL84-SE-Tube-Amplifier.jpgEL84 SE Tube Amplifier Project4326 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.
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