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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-Vacuum-Tube-Prototype-Bread-Board.jpgDIY Vacuum Tube (Valve) Prototyping Bread Board3829 viewsA simple DIY Vacuum Tube (Valve) Prototyping Test Board used to test single stage tube circuits.

See the DIY Vacuum Tube Prototyping Board post for additional details.
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MerlotJJSGallery.jpgretro-thermionic Merlot Amp with JJ KT88 Blue Glass3047 viewsNot meaning to hog the Gallery at the moment but lots of development underway with my Merlot KT88 SE UL valve amps. I'll make it short: This is the Merlot amp with matched a pair of JJ KT88 Blue Glass. Sound: weightier bass and sharper mids but the JJs are only hours old.
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KitAmpTopSmall.jpgKT88 SE UL Tube Power Amplifier2573 viewsI had put the partially finished amp in the gallery some weeks back. Now finished not a lot of difference on the outside except for the many silver colored screws on the top plate and some feet. See the other image for the underside shot. After a number of hours of careful listening and listening to it though others CD players, pre-amps and speakers I can say that most liked the sound. SE tube amps produce absolute and exquisite mid-range and silky highs and deep sound stage but this amp has a slightly narrow sound stage presentation. Bass improved and hum vanished with additional PS filter caps. With a brushed Al top plate and Mirabue timber thick timber base, Edcor XSE OPTs and component-2-component wiring on all circuit boards (including rectifier broard) this amp represents a clean and easy build with in-expensive parts. Though low powered (6W+) for a few hundred dollars you can experience the benefits of a tube SE UL design. So easy, so nice!

Here is a link to the KT88 Single-Ended (SE) Schematic I followed.
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KitAmpUnderSmall.jpgKT88 SE UL tube power amp - underside2770 viewsThe underside of a KT88 SE UL power amp consists of, Edcor XSE series OPT, Hammond 10H choke, rectifier unit with SF diodes and 200uF of filtering. Turret boards were used for the KT88 sockets (ceramic), cathode resistors and bypass caps. All other components are wired, point-to-point, on a smaller circuit board X2 caps are used for the coupling caps. All component are inexpensive and readily available. The amp suffered from hum until the filter caps were increased. 100uF before and after the choke are required. The PS delivers a very quiet 410V. 30V is dropped across the cathode resistors which provide the biasing to the power tubes. At idle 63mA is drawn per tube. The sound is extended and detailed with a 6W delivery. Excellent sound stage depth. Frequency range is from 35Hz to 46kHz (-3dB points).

The amplifier follows the Single-Ended (SE) KT88 Tube Amplifier Schematic by Mikael Abdellah.
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5751-SRPP-EL84-6BQ5-Push-Pull-Tube-Amp.jpg5751 SRPP / EL84 (6BQ5) Push-Pull Tube Amp (PoddWatt)2619 viewsAnother OddWatt tube amplifier. This one uses EL84 / 6BQ5 tubes in a self-inverting push-pull topology for the output stage driven by a 5751 SRPP. The gain is sufficient to allow direct connection to a portable mp3 player. As will all the OddWatt amplifiers, it measures very well and Bruce reports that it sounds very good. See the 5751 SRPP / EL84 (6BQ5) Push-Pull DIY Tube Amplifier project page for full details.
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a1little1.jpg6V6 12AX7 Stereo Amp2796 viewsLittle stereo vacuum tube amplifier built for a friend who wanted a tube stereo at minimal cost. It used mainly parts on hand, including a vintage radio power transformer, vintage tube sockets, and NOS 5 watt Zenith audio output transformers made for 6V6 single-ended output stages. The driver tube is 12AX7 and the tube rectifier is 5Y3G. Output tubes are old Zenith 6V6G tubes, the tall ones that look prettier than the GT style. The tube amp delivers great sound with an MP3 player as the audio source.
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KT88-OddWatt-and-ForeWatt-Preamp.jpgKT88 OddWatt Tube Amp and 5751 ForeWatt Tube Preamp2733 viewsWooden enclosures for a pair of Bruce's KT88 OddWatt Tube MonoBloc Amplifiers. Between the two mono amps is a new project - a 5751 (SRPP) ForeWatt tube preamplifier. The KT88 tubes are JJ / Tesla KT88 Blue Glass.
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Picture_024.jpg1930s style singled-ended pentode3508 viewsThis is a new amplifier I designed and built using mostly salvaged parts from British electronics of the 1930s and 40s. The valves are all British 4V types, AC/SP3 driver and N41 pentode output. The power supply uses an MU14 rectifier. The loudspeaker is a 1930s energized type - so it also acts as a smoothing filter.

See http://mike.wepoco.com/retro-geekery/wireless-world/1936-monodial-ac-super/monodial-psu for more information.
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6C33C-6S33S-Single-Ended-Valve-Amplifier.jpg6C33C (6S33S) Single-Ended Valve Amplifier4067 views6C33C (6S33S) Single-Ended Valve Amplifier with 6E5P preamp valves. The power supply is external to the amplifier. Additional details for this valve amplifier are available in the 6C33C Tube Amplifier thread.
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6C33C-6S33S-Single-Ended-Tube-Amplifier.jpg6C33C (6S33S) Single-Ended Tube Amplifier3870 viewsMy new project, a 6C33C (6S33S) Single-Ended Tube Amplifier with 6E5P driver tubes. The power supply is contained in an external enclosure. Additional details are available in the 6C33C Tube Amplifier thread.
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BoydOutSideSmall.jpgJAN6418 sub-mini tube preamp kit MKII2292 viewsThe MKII finished Oatley kit complete with 4oz brass knob. See other image for an internal photograph. The preamp has an excellent sound with good bass extension. This build was requested by an Australian women who saw the preamp article on the diyAudioProjects.com site. For more information about these little battery powered tube amplifier kits, see the JAN6418 tube preamp / headphone amp kit.
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BoydSmall.jpgJAN6418 sub-mini valve preamp kit MKII2591 viewsYet another build of the Oatley JAN6418 valve preamplifier / headphone amplifier kit. This one was built to order. An Alps blue velvet pot and 4oz brass knob and pure silver hook-up wire add to the build quality.
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Digital_Pictures_1_006.jpgKT77 Push-Pull Tube Amp (OddWatt)2204 viewsEven KT77s reach temps of around 225F Good bright heaters too. From rparsh.
Schematics are on the KT77 Push-Pull Tube Amplifier project page.
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Digital_Pictures_1_002~0.jpgBottom View - OddWatt KT77 Push-Pull Valve Amplifier2353 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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rectifier_tube_150_amp_6_phase.jpgMassive Rectifier Vacuum Tube (Valve)2598 viewsWhat a tube! This is a vacuum tube rectifier. 150 Amps with 6 channels.
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Digital_Pictures_1_033.jpgKT77 OddBlock close-up2294 viewsOddblock KT77 close-up view. Instructions for this tube amp project can be found on Bruce's KT77 Push-Pull Tube Amp page.
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Digital_Pictures_1_032.jpgKT77 Tube Amp with Guitar Speakers2045 viewsHere the KT77 OddBlocks are powering guitar speakers. (by rparsh)
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Digital_Pictures_1_031.jpgKT77 OddWatt (Push-Pull with CCS)2236 viewsFinished KT77 OddBlocks by rparsh
This build follows the KT77 Push-Pull Tube Amp instructions by Bruce but as mono-blocks.
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Jan6814HPAmpIIAirsAnd_CownSmall.jpgJAN6418 portable Triode Headphone Amp MkII1984 viewsThe finished portable triode headphone amp/preamp on top of a pair of audio-technica “AIR” head phones and the Cowon S9 in front. This "out of the box" build of the Oatley electronics JAN6418 headphone amp / preamp has a delicious sound, is compact and quite unique. See other images. It may seem odd to be driving high-end headphones with a space age SS player (Cowon S9) with an amp which employs sub-mini valves developed for the military last century. But it sounds excellent. More information about this little tube kit is available on the JAN6418 Valve (Tube) Preamplifier / Headphone Amp Kit page.
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Jan6814HPAmpIIFinisSmall.jpgJAN6418 portable Triode Headphone Amp MkII2339 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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