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OddWatt-225-6SL7-KT77-PP-Tube-Amp.jpgOddWatt 225 (driver 6SL7, output KT77 push-pull)2785 viewsThis is my version of the OddWatt 225 (push-pull) tube amplifier project that I built following the instruction on this website. The output power is 15W in pure class-A operation. The amplifier can be used with KT77 and 6L6GC output tubes.
I'm using the push-pull KT77 tube amplifier with my DIY Turntable (record player) which is a featured project on the website.
Nandor Szabo (Hungary)
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SE-JJ-300B-Hammond-125.jpg2783 viewsThis is my newest project. A SET using JJ 300B and a 6E5P driver. The audio output transformers are Hammond 125FSE (90 mA). Two electr. chock channel supply. Fixed bias - 60v. Currents - 70 mA.
Nikola (Azazello)
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6v6amp.jpg6V6 SE Tube Amplifier2782 viewsA small 2 tube amplifier with a 6V6 tube used for the output and a 6N7 general-purpose double triode used as pre amp tube. For full details see http://diy-rbt2.tripod.com
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6p45s_push-pull_class-A_amplifier.jpg6p45s tube push-pull class-A amplifier2780 viewsHello, my name is Vitaly Gorbachevsky from Russia. In this photograph is a push-pull class-A tube amplifier that I built. The maximum output power is about 34W per channel. The vacuum tubes used are 6p45s tubes in the output stage and a and longtail 6n23p driver tube. The name for this tube amplifier project is the SILVER GLOW.
Here is a link to an article that shows how the amplifier was constructed. http://people.overclockers.ru/primrose/record2/. Note that the the text is in Russian however that are several pictures in it that will be interesting.
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Ayon-Triton-KT88-Tube-Amplifier.jpgAyon Triton KT88 Tube Amplifier2777 viewsAn Ayon Triton KT88 Tube Amplifier on display at the 2011 Salon Son & Image show.
8 x KT88 and 6 x 12AU7. The amp is switchable between Class-A Operation Triode (80W) or Pentode (125W) mode.
For more coverage from the hi-fi audio show see the Salon Son & Image 2011 show coverage thread on the forum.
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DIY-Dynaco-ST70-Tube-Amp.jpgDIY Dynaco ST-70 Tube Amp Rebuild2744 viewsThis ain't your father's Dynaco ST-70 amplifier. Mahogany case with toroidal power tranny.OPTs are original Dynaco 470s purchased via auction. Trannies "capped" with same wood. Features the tubes4hifi 12AU7 version of their driver board (and I woud never go back to the 12AT7 version now).
Re-issue GoldLion KT88s, Mullard 12AU7s. Fused with an IEC and on-off switch up front. Bias adjusting performed via Red Test Jacks perpendicular to holes cut for trimmers Ground/Common is Black test jack behind center driver tube. Tubes colored with LEDs.
Charlie Mooradian
USA
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12AU7_Super_Simple_Single_Stage_284S29_Tube_Preamplifier.jpgSuper Simple Single Stage (4S) 12AU7 Tube Preamplifier2730 viewsHere is my second attempt at the Super Simple Single Stage (4S) 12AU7 Tube Preamplifier. The internal layout is a lot neater and some values have been changed which better work with the 12AU7 tube. The sound is good but not as good as the first build. But that depends on the tube in place. The 12AU7 Golden Dragon (GD) is bright and detailed the 12AU7 CONN organ tube mellow and harmonically rich. The finish on the case is Epoxy Enamel Beaten Copper. Alps pot and black heavy weight solid brass knob. Again powered by a 24VAC wall wart. The third this has been built and a Universal 4th is too come.
I have built a number of these now and full information is available in the Super Simple Single Stage (4S) tube preamplifier thread on the forum.
Mark Houston (Australia)
http://www.retro-thermionic.blogspot.com/
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BBAmpRears.jpgBBAmp (BeBamp) bread board tube amp with no driver stage2722 viewsThis is this the rear of the bread board power amp showing the OPT case with speaker binding posts and RCAs. The On/Off switch and fuse cane be seen from here. Because the OPTs were of open construction I placed them in a metal case which doubled as a terminal block for speakers and input RCAs. The tubes are JJ Blue Glass KT88.
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IMG_1943-1~1.JPGNP-100v12: 12AU7 / IRF510 Single Tube Headphone Amp2712 viewsHere's my version of the NP-100v12: 12AU7 / IRF510 Single Tube Headphone Amp, with it's companion regulator, running from an orphaned laptop power pack.
I added a simple headphone output delay during tube warmup, essentially a clone of the e12 delay from Millet Max: http://www.diyforums.org/MAX/MAXe12.php
The regulator side-kick is simply 3 50V, 1000uf capacitors before an LM317M regulator, also cobbled from the Millet Max (but without the need for the bridge diodes): http://www.diyforums.org/MAX/MAXps.php. Works swell and no noise. Audio is incredible.
Mike Y in Dallas
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Digital_Pictures_1_032.jpgKT77 Tube Amp with Guitar Speakers2683 viewsHere the KT77 OddBlocks are powering guitar speakers. (by rparsh)
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6T9-Tube-Amp-Rear.jpg6T9 Hi-Fi Vacuum Tube Amplifier2669 viewsRear view of the DIY 6T9 Tube Amplifier. The amplifier uses circuit boards purchased from Spare Time Gizmo. The power / filament transformer and audio output transformers are from Edcor. Mark's 6T9 ultra-liner tube amp modifications were also used.
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PhonoTubePreampMkIIFrontS.jpgOatley Electronics K282 - JAN 6418 tube phono preamp kit2666 viewsFront view of my second Oatley JAN6418 tube phono preamp kit build. I call this one the Special Edition version. It uses an external solid state power supply instead of the two SMPS that come with the phono preamp kit.
See my review of the 6418 Tube (Valve) RIAA Phono Preamplifier Kit for full details.
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Silver_Dragon_300BSE.jpgretro-thermionic Silver Dragon 300BSE2662 viewsThis amp has taken nine months to build. It was design by
Suncalc on the forum from the ground up based on three criteria I stipulated: 1-two stage 0NF, 2-6SN7 and 300B tubes with tube rectification and 3-Single ended.
Most of the main components were selected by the customer I built it for: TJ Full Music 300BSE(RRP $1200), 50 year Treasure 6SN7, Audio Note Silver foil caps, Mundorf M-Tube poly filter caps, silver wire in the audio path. Other components were my selection.
The bass is extended, full rich mids and treble bright and extended. Very expensive to build and a long time in the making but really worth it. http://www.retro-thermionic.blogspot.com/
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Jan6814HPAmpIIAirsAnd_CownSmall.jpgJAN6418 portable Triode Headphone Amp MkII2661 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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Oatley-K272C-Headamp-Kit.jpgOatley K272C JAN6418 tube based headphone amp kit2655 viewsIn this build I used bituminized aluminum foil to line the ABS plastic compact enclosures and switched 6.5 mm stereo phone jacks. Only with both source and headphone plugs inserted and the press button switched “on†at the rear will power flow. Wire-wrap wire has been used in the signal path and the battery health LEDs have been brought out to the front of the enclosure. The sound appears to have better bass than previous models but the tubes will ring if struck.
For more info, see the
K272C Oatleys JAN6418 tube based headphone amp\preamp
thread in the forum.
Mark Houston – retro-thermionic
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Jan6418JewelBoxRear.jpgJAN6418 Sub-mini preamp in a plush Jewelery box2653 viewsThe rear of the Jewelery box has a brushed Aluminum plate to hold the input / output RCA connections and on off switch. The wood was too thick to mount the RCAs directly. See other photos of this build for more info about the JAN6418 Sub-mini preamp.
Complete details about this low cost and low voltage tube amp kit are available on the 6418 Tube Preamplifier Kit page.
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RFTUBES.jpgRF tubes in audio use2648 viewsThe use of RF tubes in audio amplifiers may be a good option and saves some money. Here you have the descriptions of some experiments done in this field. For details see http://diy-rbt5.tripod.com/
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BBAmpDriverS.jpgRemote driver stage for Be Bamp - rear view2628 viewsRear view of my Tea Box 6N1P remote driver stage for the Bread Board KT88 SE UL tube amp.
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6CY7-Stereo-Amplifier.jpg6CY7 Stereo Amplifier2613 views"This is a nice little low power stereo amp (1.3W/channel) based on the 6CY7 tube. The amp uses a Hammond power transformer and chokes and a pair of Edcor XSE10-8-5K output transformers. I have to say that it sounds really nice. There is just something about triode SE amps that nothing can beat. The peak clean power output is 1.3 watts RMS per channel (as determined from watching an oscilloscope). The 3dB frequency response is ≈48 Hz to 30 KHz."
Matt Renaud
Pacific Northwest, USA
Project Thread: http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=5222
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Oatley-Electronics-K295-Tube-Buffer-Kit-Enclosed.jpgOatley Electronics K295 Tube Buffer Kit - Enclosed2600 viewsThe finished K295 tube buffer kit which will be used for an instrument preamp.
There is more information in the K295 stereo JAN6418 tube buffer / preamp kit thread.
See the inside photo of the Oatley Electronics K295 Tube Buffer Kit.
Mark Houston (Australia) - Mongrel Dog Audio
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