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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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IMG_1943-1~1.JPGNP-100v12: 12AU7 / IRF510 Single Tube Headphone Amp2376 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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OddWatt-225-6SL7-KT77-PP-Tube-Amp.jpgOddWatt 225 (driver 6SL7, output KT77 push-pull)2365 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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6T9-Tube-Amp-Rear.jpg6T9 Hi-Fi Vacuum Tube Amplifier2355 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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Jan6418JewelBoxRear.jpgJAN6418 Sub-mini preamp in a plush Jewelery box2353 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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Ayon-Triton-KT88-Tube-Amplifier.jpgAyon Triton KT88 Tube Amplifier2353 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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12AU7_Super_Simple_Single_Stage_284S29_Tube_Preamplifier.jpgSuper Simple Single Stage (4S) 12AU7 Tube Preamplifier2350 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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Jan6814HPAmpIIAirsAnd_CownSmall.jpgJAN6418 portable Triode Headphone Amp MkII2342 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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PhonoTubePreampMkIIFrontS.jpgOatley Electronics K282 - JAN 6418 tube phono preamp kit2340 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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RFTUBES.jpgRF tubes in audio use2332 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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6SN7-6V6-SE-Black-Lace.jpgBlack Lace - SE 6V6 Amplifier2329 views“Black Lace” - an all Australian tube amplifier with tubes from the 60’s. Miniwatt: 6V6 black glass, 6SN7 and 5U4. Old school build with PIO caps, solder from the 70’s with copper and carbon film resistors. See the forum thread Black Lace - 6V6 power amp, old school for more information.

Mark Houston – retro-thermionic
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BBAmpDriverS.jpgRemote driver stage for Be Bamp - rear view2316 viewsRear view of my Tea Box 6N1P remote driver stage for the Bread Board KT88 SE UL tube amp.

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DIY-Dynaco-ST70-Tube-Amp.jpgDIY Dynaco ST-70 Tube Amp Rebuild2311 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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6DJ8-6AS7-OTL-HP-Amp-Sanguine.jpgSanguine - 6AS7 OTL Headphone Amplifier2295 viewsThe power supply and amp section are on two die-cast Al bases. A Sophia Mesh Plate Princess 274B rec. tube does the rectification. The PS has its own power filter to reduce EMI\RFI and the mains cable is choked. The power transformer is Hammond and the 20H choke is Hammond also and these are both isolated from the chassis by rubber grommets to control vibration. The 6AS7 power tube is NOS Winged "C" Svetlana and a NOS Tesla E88CC gold pin for the driver and is directly coupled. XLRs connect the HT and AC filament current to the amp section. A single 6.5mm input upfront with dual headphone output. Attenuation is provided by an Alps Blue Velvet pot. Both enclosures are dampened with bituminous Al foil and the paint is Epoxy Enamel. The attenuator knob is 4 ounces of solid brass.

The Sophia Mesh Plate 274B rec. tube and a 4uf PIO Russian filter cap start the filtering network with seven stages of filtering and storage in all. There is no PCBs or shielded wire used in this amp to dull the sound. Wiring is all point-2-point and component-2-componet. Fine silver plated wire warp wire carries all the audio. The only caps in the amp are the output caps. WBT silver solder is used throughout.
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Silver_Dragon_300BSE.jpgretro-thermionic Silver Dragon 300BSE2291 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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Oatley-Electronics-K295-Tube-Buffer-Kit-Enclosed.jpgOatley Electronics K295 Tube Buffer Kit - Enclosed2242 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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Super_Simple_Single_Stage_Tube_Preamp.jpg4S “The Black” Tube Preamp2199 viewsThis the third Super Simple Single Stage (4S) Tube preamp I have built. Dubbed “The Black”. The schematic is quite different from the original. Thanks Matt. Best sounding so far and supporting a Golden Dragon 12AU7 tube. The preamp still runs from a 24VAC wall wart and same PS as the other two builds. Big bass and detailed mids.

See my post about The Black - 4S preamp MKIII for more information.



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two-stage-RIAA-phono-tube-preamp.jpgTwo stage tube phono preamp with RIAA equalization2189 viewsAfter building a number of diy jFet based phono preamps, on request from a friend, I built this two stage tube phono RIAA preamp. The circuit design is from the TubeCAD Journal and is one of the simpler designs on the site. The circuit construction is contained on veroboard (perfboard) and housed in extruded aluminum enclosures from Hammond. The external PS run from a 24VAC wall wart. A step-up tranni converts this to 260V and a two stage C-R filtering ensures clean power. The heater voltage is DC. Tubes are Golden Dragon 12AX7s. Russian PIO caps are used in the inter-stage coupling/output and Sprague orange drops for the RIAA stage. With my Grado Reference MM wood body cartridge this preamp sounds divine.

Mark - retro-thermionic
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6CA7_Tubes_in_Philips_EL6431_Amplifier.jpg6CA7 Tubes in a rebuilt Philips EL6431 Amp2175 viewsThe four 6CA7 (EL34) output tubes of the Philips EL6431 amplifier. See the other photos in the gallery and there is also more information and photographs in the 120 watt Philips EL6431 (EL34/6CA7) Tube Amplifier thread on the forum.

Alan (Canada)
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Class-D-SureElectronics-Amp-Inside.jpgClass-D Sure-Electronics Amplifier (Inside)2161 viewsThis is my first DIY Class-D amplifier. The amp is based on a $30 Sure-electronics module. The amplifier modules requires only a 30VDC high current power supply because into 4 ohm it can produce 100Wpc. The enclosure is an off the shelf 2U 19” rack mount type. The power supply has an 18-0-18V, 9A toroidal transformer. A 10A rec bridge, some snubbing caps and 30,000 uF of stage caps make up the power supply. Two selectable inputs provide direct connection to the amp module or connection via an Alp pot and 4 Oz brass knob. Very crisp sounding with good detail... See the forum thread Class D 100W power amp for more information.

Mark Houston – retro-thermionic
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Decware-inspired-EL84-amp.jpgDecware inspired EL84 amp with attenuation2142 viewsThis is a Decware inspired EL84 power amp with attenuation. My twist was to make a it a EL84 SE UL (not triode). Also I upgraded the PS a little. One PS tweak was to use a Russian PIO 4uf cap as the first cap in the PS. Also the larger electros are all snubbed.

The inter-stage caps are Audio Note Tin foil, mylar and oil. The amp I called "Tamarisk" - just like how it sounds. The finished amp looks good and not too heavy. Sound is a big step up from my already great sounding 6V6 - Ozzie tube SE UL amp. On live classical every part of the music has a layer. There every instrument is heard in its own layer and decay, reveb etc also have their own layers.

Mark Houston – retro-thermionic

Forum Thread: http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=5385
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