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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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mag02.jpgMagnavox 93 Series Tube Amp Rebuild2651 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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IMG_2678.JPG50EH5 / 25EH5 Tube Ampr with 12AU7 Mini Tube Preamp2649 viewsYet another picture of the 50EH5 Tube amp in action along side with the Mini 12AU7 tube preamp.
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OddWatt-KT88-Push-Pull-Tube-Amp-Kit.jpgOddWatt / OddBlock KT88 Push-Pull Tube Amp Kit2640 viewsA finished OddWatt / OddBlock KT88 Push-Pull Tube Amp Kit. This KT88 tube amplifier kit can be purchased from OddWattAudio.com. The tube amp kit comes with a NOS JAN Philips Branded 5751 (US made) preamp tube. The output tubes are and new production Genalex Gold Lion branded KT88 tubes (Russian made). As you can see, the power and audio output transformers are from Edcor.

Complete DIY instructions to build the similar OddBlocks 12SL7 SRPP / KT88 SIPP (Push-Pull) Tube Amplifier are also available.
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12AX7-Tube-Preamp-Kti-Bottom.jpg12AX7 Tube Preamplifier Kit - Bottom2630 viewsAn underside view of the 12AX7 Tube Preamplifier Kit . The chassis was made from scrap cherry wood finished with stain and varnish. The top plate is 2mm thick aluminum, from a metal fab shop.
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photo-4.jpgBob's Dynaco ST-35 with VU Meter2628 viewsTube amp using Dynaco ST-35, Edcor iron and a plasma VU meter using IN-13 nixie tubes.
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EL84-CCS-Push-Pull-Tube-Amp.jpgEL84 / 6BQ5 Push Pull Tube Amplifier2627 viewsThe "OddWatt", a EL84 / 6BQ5 Push Pull (PP) Tube Amp project. SRPP input stage and ultra linear output stage with LM317 Regulators CCS. Tube heaters are 12VDC.
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000pbs6w.jpg25L6G Tube Stereo Amplifier2626 views25L6G Tube Stereo Amplifier
A work in progress. This is only an assemblage of parts so far with nothing bolted together, but it gives sort of a preview of the finished project. The chassis will be painted black wrinkle much like the transformer covers in the back. The driver tubes are 12SN7s and 6SL7s
-Steve (zstrat)
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IMG_2554.JPG50EH5/25EH5 Filament Reg. Power Supply2596 viewsThis is the inside of the regulated power supply for the 50EH5 / 25EH5 tube filaments. It uses an LM317 voltage regulator and an old VCR power transformer that had just the right voltage and current ratings for the filaments of the 50EH5 / 25EH5 tubes. The output from the regulator is set for 20 some volts for the 25EH5's, and the unregulated DC is about 45V for the 50EH5's.
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TeaBoxTopII.JPGTwinings Tea Box 12AX7 Valve Preamp II2591 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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DIY-KT77-Push-Pull-Tube-Amp.jpgDIY KT77 Push Pull Tube Amplifier2589 viewsThe second "OddWatt" tube amp project. This one is the Oddwatt 225 which will work with a number of octal tubes. Again, the driver stage is an SRPP using 6SL7 tubes and the output stage is a Class A UL SIPP using KT77 vacuum tubes.LM317 Regulators are used to provide the cathode CCS.

For more information, see the 6SL7 SRPP / KT77 SIPP (Push-Pull) DIY Tube Amplifier project page.
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Pre5Y3.JPG5Y3 rectifier tube and Twinings Tea Box valve preamp2586 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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apic8A.jpgTwo Buck Chuck - 50EH5 Tube Amp2578 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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Nagra-300i-300B-Integrated-Amplifier.jpgNagra 300i Integrated Tube Amplifier (300B)2575 viewsThe new Nagra 300i Integrated 300B Tube Amplifier on display at the 2011 Salon Son & Image show.

The integrated amplifier uses four JJ 300B directly heated triodes in a push-pull configuration in class-A operation. Output power is 20Wpc.
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WFR-20_1.jpgSangean internet table radio2568 viewsReally neat & nice sounding internet table radio. Works with a direct LAN connection or wifi. You have access to over 6000 internet stations sorted in a Genre or by Country list. Has a line out so you can hook it up to your stereo, or play songs stored on your PC.
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Oatley-Electronics-K295-Tube-Buffer-Kit.jpgOatley Electronics K295 Tube Buffer Kit2556 viewsThe production version of the K295 has been cased in a bitumanised Al lined plastic plastic case. Guitar jack input and outputs are on the rear and large numbered knobs on the front. The blue led indicates "0" position of the attenuators. The preamp can be plugged directly into the mains. Good sounding and simple to build.

There is more information in the K295 stereo JAN6418 tube buffer / preamp kit thread.

Mark Houston (Australia) - Mongrel Dog Audio
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DIY-12AU7-Tube-Preamplifier.jpgMini 12AU7 Vacuum Tube Preamplifer2551 viewsThis is a simple 12AU7 tube preamp built using a couple of Hammond cases and a few reused parts.
By: Alan M.
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Atwood3.JPG12AX7 Valve Preamp with Jupiter Beeswax Caps2546 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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Tube-Amp.jpgSV811-10 single-ended tube amp.2533 viewsRussian Svetlana SV811-10 Single Ended Monoblock tube amp.
Circuit by Eric Barbour.
See it on YouTube. @closin99
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BBAmpS.jpgBBAmp (BeBamp) bread board tube amp with no driver stage.2521 viewsI wanted to see if I could drive a SE UL tube power stage from a two stage tube preamp. This bread board amp (BBAmp - BeBamp) was constructed to test the theory. Most bread board amps have the wiring exposed. I wanted this to look and sound excellent so all wiring is underneath the bread board. There are lots of exposed components e.g. rectifier components, but all wiring is hidden. The bread board is Australian pine, sanded and treated with Australian beeswax. Edcor OPTs are enclosed in the aluminum case (back right) which provides a back plate for speaker posts and input RCAs. The amp is absolutely dead quiet and extremely transparent. The amp will produce the sonic signature of your preamp. A high gain preamp and very sensitive speakers are required. This can be shipped as a modular bread board kit amp. The tubes are JJ Blue Glass KT88.
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50EH5-Single-Ended-Tube-Amp.jpgSingle-Ended 50EH5 Tube Amp2519 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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