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IMG_2678.JPG50EH5 / 25EH5 Tube Ampr with 12AU7 Mini Tube Preamp3229 viewsYet another picture of the 50EH5 Tube amp in action along side with the Mini 12AU7 tube preamp.
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PhonoRear.JPGDIY Phono Preamplifier Kit3226 viewsThe finished kit (see other photos) can be assembled in an afternoon. I used insulated gold plated RCAs but on an ABS plastic case like this insulated RCAs are not required. Keeping all connections on the rear makes for a simple front panel with gain control and recessed red led. I used thick silicon stick-on feet to ensure vibration into the unit is kept to a minimum. Stick down computer stand-off hold the cct. brd. to the bottom of the case and also help with vibration control. The case is lined with heavy sticky tar and foil. Base, sides and lid and are lined but not earth. This helps with shielding the low voltage levels and case dampening also. Shielded wiring is used internally and silver solder used throughout.
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mag02.jpgMagnavox 93 Series Tube Amp Rebuild3224 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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SE_807_Tube_Amplifier.jpgSE 807 Tube Amplifier3224 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
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Pre5Y3.JPG5Y3 rectifier tube and Twinings Tea Box valve preamp3193 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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DIY-ECC802S-12AU7-ECC82-Vacuum-Tube-SRPP-Preamplifier.jpgDIY ECC802S Tube SRPP Preamplifier3190 viewsThis fantastic looking piece is a ForeWatt ECC802S tube SRPP preamplifier by Bruce. The gain of the preamp can be set at 7 or 11. 12AU7 and ECC82 tubes can also be used. The power supply is solid state.
For full details see the ForeWatt DIY ECC802S (12AU7 / ECC82) Vacuum Tube SRPP Preamp project page.
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apic8A.jpgTwo Buck Chuck - 50EH5 Tube Amp3169 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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TeaBoxTopII.JPGTwinings Tea Box 12AX7 Valve Preamp II3168 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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Audio-Note-Jinro-Integrated-211-Tube-Amplifier.jpgAudio Note Jinro Integrated Tube Amp (SE 211)3165 viewsAudio Note Jinro Integrated Tube Amplifier on display at the 2011 Salon Son & Image show in Montreal.
Tubes: 2 x 5R4WGB, 2 x 211, 1 x ECC82 (or 5814a), 1 x 7044 (or 5687).
Power: 18Wpc into 8ohm @ 5% THD.
Weight: 85lbs
Cost: $26,500
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IMG_2554.JPG50EH5/25EH5 Filament Reg. Power Supply3159 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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Gobo-LM1875-Stereo-Amplifier-Kit.jpgGobo LM1875 Stereo Amplifier Kit3154 viewsThe Gobo Stereo Amplifier kit is a class-AB chip amp kit based around the LM1875 IC. This is a complete amp kit that includes all the necessary parts and enclosure to build a stereo amplifier. The LM1875 amp kit comes with audio-grade capacitors and toroidal transformer. The Gobo amplifier kit is easy to build, looks and sounds great. The amplifier kit is well suited to first time amp builders.
For full details, see our review of the Gobo LM1875 Stereo Amplifier Kit
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BBAmpS.jpgBBAmp (BeBamp) bread board tube amp with no driver stage.3152 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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EL84-CCS-Push-Pull-Tube-Amp.jpgEL84 / 6BQ5 Push Pull Tube Amplifier3146 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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F2.jpgTube amplifier for guitar and music listening3145 viewsDIY tube amp for guitar and music. 12AT7 input tube and singled ended EL34 output tube. Power output is about 10 Watts.
For more details about this tube amplifier see: http://sites.google.com/site/diyrbt6/ (Portuguese)
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12AX7-Tube-Preamp-Kti-Enclosure.jpg12AX7 Tube Preamplifier Kit3134 viewsA finished photos of the 12AX7 Tube Preamplifier Kit. The volume control is an Alps pot salvaged from an old Sony amp. I added a second input and switch to allow multiple inputs. There is also a second out for a subwoofer.
The preamp is dead quiet and the sound is far more than I had hoped for. My spouse was skeptical, shall we say. But when she heard familiar music she was hearing things never heard before and the bass was thicker and richer. I heard a much bigger sound stage, sparkling highs. Very impressive. Thanks to Bruce Heran for all his help with this project.
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Jan6814HPAmpIIFinisSmall.jpgJAN6418 portable Triode Headphone Amp MkII3126 viewsThe finished (second) headphone amp is assembled in a slim durable plastic enclosure lined top and bottom with bituminized heavy Al foil. You can see the lithium battery, printed cct. brd. and 6.5mm stereo phono sockets. In this build the stereo phono sockets have double pole double throw switches which are all employed, including the “real†switch. The switches make only when both devices are plugged into the amp. The idea is if you do not have devices plugged into both input and output and have the switch on then the unit is “off†with no battery drain. The battery is lithium so expensive bit I should get 80 to 100 hours of play out of this little portable triode headphone amp. See the JAN6418 Valve (Tube) Preamplifier / Headphone Amp Kit project page for full details.
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DIY-12AU7-Tube-Preamplifier.jpgMini 12AU7 Vacuum Tube Preamplifer3122 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 Caps3121 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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Digital_Pictures_1_002~0.jpgBottom View - OddWatt KT77 Push-Pull Valve Amplifier3120 viewsBottom view of my build of the Oddblocks amps from rparsh. I decided to incorporate a switch on the CCS so I can also use this amp with my JJ KT88s too.
This build follows the OddWatt KT77 Push-Pull Tube Amplifier instructions by Bruce but I built mine as mono-blocks.
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SE-6V6-Amplifier-after-Lacewood.jpgCopy of Matt's SE 6V6 Lacewood amplifier3113 viewsHello,
This is my copy of Matt’s (Suncalc) single-ended 6V6 Lacewood amplifier which is actually made from Sri-Lankan Satinwood, Padauk and brass.
Keith Graham Cheltenham, UK.
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