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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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Ayon-Triton-KT88-Tube-Amplifier.jpg
Ayon-Triton-KT88-Tube-Amplifier.jpgAyon Triton KT88 Tube Amplifier2001 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.
12AU7_Super_Simple_Single_Stage_284S29_Tube_Preamplifier.jpg
12AU7_Super_Simple_Single_Stage_284S29_Tube_Preamplifier.jpgSuper Simple Single Stage (4S) 12AU7 Tube Preamplifier1993 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/
Push-Pull-6V6GT-6SN7GT.jpg
Push-Pull-6V6GT-6SN7GT.jpg6V6GT Push-Pull (PP) Amplifier1987 viewsThe 6V6 PP Amp is my very 1st attempt at valves and built it about 18 months ago...

Keith (Christchurch, New Zealand)
OddWatt-225-6SL7-KT77-PP-Tube-Amp.jpg
OddWatt-225-6SL7-KT77-PP-Tube-Amp.jpgOddWatt 225 (driver 6SL7, output KT77 push-pull)1977 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)
Silver_Dragon_300BSE.jpg
Silver_Dragon_300BSE.jpgretro-thermionic Silver Dragon 300BSE1946 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/
6EM7-SE-Amp.jpg
6EM7-SE-Amp.jpgSE 6EM7 Power Amplifier1938 viewsYet another 6EM7 power amplifier. This time some parts were down graded and a different internal layout technique was used. The power transformer and choke are isolated top and bottom by rubber grommets. This ensures no AC vibration reaches the tubes. The initial power supply filtering is preceded with a on-board power filter, a 20uF/450V electrolytic capacitor and a 20H/100mA Hammond choke. The HT is supplied by a Hammond power transformer and Sovtek 5Y3 rectifier tube. The second stage of filtering is 47uF and 100uF electrolytic with a large limiting resistor ensure the amp is totally free from of hum and noise. All power supply capacitors are snubbed.

This amp sounds better than the last and I think it may be the Sylvania NOS 6EM7 tubes. Sprague orange drops are used in the inter-stage coupling and once more large non-polarized capacitors for the bypass on the power tubes. For the first time I have used Chinese made H&K 15W audio output transformers, can't fault them. The look of the amp is almost under-stated "sexy" and the sound the same - sexy and natural.

Mark Houston – retro-thermionic

UPDATE - June 2015 - see the 6EM7 Single-Ended Triode (SET) Vertical Amplifier project page for the latest revision of this amplifier.
DIY-Dynaco-ST70-Tube-Amp.jpg
DIY-Dynaco-ST70-Tube-Amp.jpgDIY Dynaco ST-70 Tube Amp Rebuild1922 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
Oatley-Electronics-K295-Tube-Buffer-Kit-Enclosed.jpg
Oatley-Electronics-K295-Tube-Buffer-Kit-Enclosed.jpgOatley Electronics K295 Tube Buffer Kit - Enclosed1911 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
Juan-ZCA.jpg
Juan-ZCA.jpgZCA by Juan1893 viewsGood day

I would like to add some of my pictures about my ZCA build from your site and I must say that this amp sound very good.

Regards
Juan
6V6-Push-Pull-Amplifier.jpg
6V6-Push-Pull-Amplifier.jpgPush-Pull (PP) 6V6GT Tube Amplifier1858 viewsThis 6V6 amp was built following the DIY Push-Pull (PP) 6V6 / 6V6GT Tube Amplifier Schematic. Power Supply transformer and Output transformers are handmade in Argentina by NavasBaccino. I'd like to thank Brad S. for the help. The sound is amazing and clear, free of distortion.

Gabriel Rofrano, ARGENTINA

Video link

Super_Simple_Single_Stage_Tube_Preamp.jpg
Super_Simple_Single_Stage_Tube_Preamp.jpg4S “The Black” Tube Preamp1854 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.



6CA7_Tubes_in_Philips_EL6431_Amplifier.jpg
6CA7_Tubes_in_Philips_EL6431_Amplifier.jpg6CA7 Tubes in a rebuilt Philips EL6431 Amp1836 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)
BBAmpDriverFrontS.jpg
BBAmpDriverFrontS.jpgRemote driver stage for Be Bamp in a tea box1822 viewsTo increase the volume level of the Bread Board amp (Be Bamp) a driver stage was built. This is the original cct. used in the Merlot amps with some components upgraded. The is no volume control or input cap and pure silver wire used in the signal path. Russian Military caps (paper and foil) were used for the inter-stage caps. Low ESR caps used where possible. The timber box is bitumanized Al foil lined. Tube is a Russian 6N1P.

The Be Bamp can now deliver full volume to the point of clipping. Well short of clipping a high volume level can be obtained with large 91db sensitive 3-way tower speakers. With the driver stage being remote other driver stages can be matched to the power stage and share the power supply. This provides another level of experimentation and flexibility with the over-all system.
two-stage-RIAA-phono-tube-preamp.jpg
two-stage-RIAA-phono-tube-preamp.jpgTwo stage tube phono preamp with RIAA equalization1821 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
Gobo-LM1875-Stereo-Amplifier-Kit.jpg
Gobo-LM1875-Stereo-Amplifier-Kit.jpgGobo LM1875 Stereo Amplifier Kit1803 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
12au7_4S_preamp.jpg
12au7_4S_preamp.jpg12au7 preamp1778 viewsIn this build I employed a single stage tube preamp to provide gain and volume control to my 3W 6AS7 SET amp. This preamp uses a 24VAC wall wart and by configuring a 24/240V step down tranni to work backwards I can gain 280VDC across the 12AU7. No hook-up wire is used in the amp cct. only component-2-component wiring. The preamp produces no hum or buzz. It extends to a deep rich bass and very natural mids and highs. The frequency response is flat from 10hz to 130KHz and square way performance is exceptional. There is more information in the Super simple single stage tube preamp thread on the forum.

http://www.retro-thermionic.blogspot.com/
Philips_EL6431_Amplifier_Guitar_Amp.jpg
Philips_EL6431_Amplifier_Guitar_Amp.jpgPhilips EL6431 Guitar Amplifier Rebuild1773 viewsThis vintage Philips amp uses 4 x EL34/6CA7 tubes to obtain an output power of around 120 watts into an 8 ohm speaker. The supply voltage on this amplifier is 825 volts! I managed to rebuild and convert the Philips EL6431 into an instrument amplifier that I can hook my bass up to as well as play music.

There is more information and photographs on my rebuild in the 120 watt Philips EL6431 Tube Amp thread on the forum.

Alan (Canada)
SE-6V6-Amplifier-after-Lacewood.jpg
SE-6V6-Amplifier-after-Lacewood.jpgCopy of Matt's SE 6V6 Lacewood amplifier1763 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.
Scott-299-Amplifier.jpg
Scott-299-Amplifier.jpgScott 299 Amplifier Rebuild1758 viewsThis is a picture of my 299 Scott Amplifier. I made the whole enclosure case using 1/2" (13 mm) aluminum. The knobs are made of one and 1-3/8" roll aluminum. The face plate is made from a piece of stainless steel with silk screened lettering. The Scott 299 amplifier was completely re- built from the ground up and it sounds great.

Thank you,
Ken Valeo (USA)
6DJ8-6AS7-OTL-HP-Amp-Sanguine.jpg
6DJ8-6AS7-OTL-HP-Amp-Sanguine.jpgSanguine - 6AS7 OTL Headphone Amplifier1748 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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