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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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KitAmpUnderSmall.jpg
KitAmpUnderSmall.jpgKT88 SE UL tube power amp - underside2831 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.
Oct 31, 2009
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5751-SRPP-EL84-6BQ5-Push-Pull-Tube-Amp.jpg5751 SRPP / EL84 (6BQ5) Push-Pull Tube Amp (PoddWatt)2685 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.Oct 19, 2009
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a1little1.jpg6V6 12AX7 Stereo Amp2849 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.Oct 10, 2009
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KT88-OddWatt-and-ForeWatt-Preamp.jpgKT88 OddWatt Tube Amp and 5751 ForeWatt Tube Preamp2788 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.Sep 29, 2009
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Picture_024.jpg1930s style singled-ended pentode3575 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.
Sep 23, 2009
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6C33C-6S33S-Single-Ended-Valve-Amplifier.jpg6C33C (6S33S) Single-Ended Valve Amplifier4142 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.
Sep 14, 2009
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6C33C-6S33S-Single-Ended-Tube-Amplifier.jpg6C33C (6S33S) Single-Ended Tube Amplifier3953 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.
Sep 14, 2009
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BoydOutSideSmall.jpgJAN6418 sub-mini tube preamp kit MKII2350 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.Sep 14, 2009
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BoydSmall.jpgJAN6418 sub-mini valve preamp kit MKII2651 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.Sep 14, 2009
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BattMMPreSmall-2.jpgMM Phono Preamp (battery powered)3671 viewsMy second build of the Jaycar MM phono preamp kit is house in a sleek enclosure and runs from Three 9V lithium batteries. An Alps Blue Velvet potentiometer is topped off with a solid brass black chrome knob. The preamp is very smooth sounding and better than my earlier version which uses an AC supply and regulators on board. See the MM Phono Preamp (battery powered) - inside image for an internal sview.Sep 08, 2009
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BattMMPreSmall-1.jpgMM Phono Preamp (battery powered) - inside4686 viewsThis is my second build of the Jaycar MM phono preamp kit I have completed. This time I wanted it to run from batteries. Three 9V lithium batteries in series provide 27V. A resistive network produces a virtual +/- 13.5V supply for the OPA2134 opamp chips. The cct. brd.(PCB) can very easily be wired so diodes and regulators are not required. No track (trace) cutting is required and only a few simple straps and two resistors are required. An Alps Blue Velvet pot and pure silver wire, silver solder and gold RCAs make this a quality build. Bitumanised Aluminum foil lines the lid and bottom of a sleek compact ABS plastic enclosure to form a smart looking excellent sounding MM phono preamp. See the additional images.Sep 08, 2009
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IMG_2158.JPGNoyMark CS8412 + 8 x TDA1541A parallel battery powered nos dac project5288 viewsI built a few big power set tube amps with big triodes such GM70, 833. I wanted to do something different and completed my first diy nos battery powered DAC project. It use CS8412 as digital receiver and 8 X PHILIPS TDA1541A parallel as dac circuit. As buffer, i used two mono opamps OPA627. It uses no digital or analog filter. Sounding incredible natural (even one of my friend describing it as organic), warm and also detailed. Very silent background. I am very happy to do this equipment, otherwise i had to pay very big money for same sound. After charging the batteries, it works more than 10hours continuously. When i turn off the dac, it charges the batteries automatically. You can see other photos below:
http://stereomecmuasi.com/forum/viewtopic.php?f=46&t=965
http://stereomecmuasi.com/cihazlar/muziksayi3/noymarkdac.htm
Sep 02, 2009
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Digital_Pictures_1_006.jpgKT77 Push-Pull Tube Amp (OddWatt)2261 viewsEven KT77s reach temps of around 225F Good bright heaters too. From rparsh.
Schematics are on the KT77 Push-Pull Tube Amplifier project page.
Sep 01, 2009
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Digital_Pictures_1_002~0.jpgBottom View - OddWatt KT77 Push-Pull Valve Amplifier2412 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.
Sep 01, 2009
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rectifier_tube_150_amp_6_phase.jpgMassive Rectifier Vacuum Tube (Valve)2659 viewsWhat a tube! This is a vacuum tube rectifier. 150 Amps with 6 channels.Aug 31, 2009
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Digital_Pictures_1_033.jpgKT77 OddBlock close-up2348 viewsOddblock KT77 close-up view. Instructions for this tube amp project can be found on Bruce's KT77 Push-Pull Tube Amp page. Aug 31, 2009
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Digital_Pictures_1_032.jpgKT77 Tube Amp with Guitar Speakers2088 viewsHere the KT77 OddBlocks are powering guitar speakers. (by rparsh)Aug 31, 2009
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Digital_Pictures_1_031.jpgKT77 OddWatt (Push-Pull with CCS)2284 viewsFinished KT77 OddBlocks by rparsh
This build follows the KT77 Push-Pull Tube Amp instructions by Bruce but as mono-blocks.
Aug 31, 2009
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Copy_of_Turntable_092.jpgDIY Turntable7657 viewsThis is the Finished Turntable with Dynavector DV10X5 MC on one tonearm and a Shure M97XE on the other. Both tonearms were extended and DIY Headshells were used. The Sealed Lead Acid Battery does a great job powering the TT and with only an hour or two listening per day, lasts all week (Maybe longer??)Aug 25, 2009
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2~0.jpg2SK1058 Single-Ended Class-A Amplifier. Retro style design.4413 viewsRetro style design Class-A power amplifier with zero negative feedback. It was built based on the schematic of DIY Class-A 2SK1058 MOSFET Amplifier project by Mark Houston.
For more pictures and details, please visit http://alexkap.com.
Aug 22, 2009
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