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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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Digital_Pictures_1_033.jpgKT77 OddBlock close-up2360 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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BoydOutSideSmall.jpgJAN6418 sub-mini tube preamp kit MKII2360 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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5751-SRPP-Push-Pull-EL84-Tube-Amp.jpg5751 SRPP / Push-Pull EL84 Tube Amplifier2358 viewsThree months ago, I finished the PoddWatt 5751 SRPP / Push-Pull EL84 tube amp. This is a great amplifier with great sound. Now it is connected in UL mode without any NFB. I would like to try the amp in a Triode connection mode, but I do, there is too much power loss so I am investigating a the possibility of a parallel push-pull output stage.

This enclosure is made using the material Corian which is a product by DuPont often used for counter-tops.

Dean

For full details of this tube amplifier circuit, see the PoddWatt 5751 SRPP / EL84 (6BQ5) Push-Pull Tube Amp Project page.
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DSCN0084s.jpgSE RCA 2A3 Triode Tube Amp2350 viewsMy favorite class-A single-ended (SE) tube amplifier an RCA 2A3 triode driven by a Phillips E180F pentode. The audio output transformers are Hammond 125 FSE.

The power is external in the black box on the right side. 2x4 w and consists of Black Gate and Rubycon capacitors. Resistors carbon
film and Mills. Autobias. Interstage transformers
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TeaBoxInsideSmall.jpgTwinings Tea Box 12AX7 Tube Preamp with External 5Y3 Power Supply2347 viewsIn this build I used the Jensen copper, paper and oil caps for the input, output and inter-stage coupling and Solen Teflon for the feedback capacitor. The preamp is a two stage triode (12AX7s AWA-Australian) with global feedback and is the original Silicon Chip design with some modifications. They are bigger caps all round and no printed cct. brd. Construction of brds. was component-2-component wiring which means there is NO additional wire used on the brd. construction. At the brd. level this is better than point-2-point wiring. This cuts down on soldered connections/junctions and cct. length. All 99.999% pure silver wire with heat shrink insulation is used in the signal path to connect brds. to RCAs and Alps blue velvet pot etc. Medium gauge OFC hook-up wire brings power to the brds. Heavy bituminised Al foil lines the light timber case to provide a ground plain and RFI/EMI shielding. The remote PS employs a 5Y3 rec. tube (Australian made in this case) Hammond 370X power tranni 193B 12H choke.
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Push-Pull_6L6_Tube_Amplifier.jpgPush-Pull 6L6 Tube Amplifier2340 viewsMy DIY 6L6 tube amplifier. The output tubes are 6L6 which are driven by a pair or 12AX7. The indicator tube is an EM80. See the other photos.

Panagiotis Gavriil (Greece)

See the DIY Audio Schematics page for more 6L6 circuits.
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parallel-6C33C-tube-power-amplifier.jpgDon's parallel 6C33C tube power amplifier2335 viewsDon the amp builder (who’s 300B amp is posted in the gallery) has put together this parallel 6C33C power amp. Though not complete it’s not hard to see this is going to be a great looking amp. With the twin power tubes the primary impedance of the OPTs can be lowered to produce greater output power. The toroidal transformer is for the heaters which draw a huge amount of current. The top plate is ABS and Don made the base and is now making bases for me. All other trannies are Dyne who a local winders (Victoria Australia). Can’t wait to hear this one. Don also has a 2A3 almost finished.

Mark Houston
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SE-6AS5-Pentode-Amp_.jpg6AS5 Micro-Power 1W/channel UL Amp2331 viewsA nice class-A stereo amp based on the 6AS5 pentode. The amp uses a 6CG7 driver tube to drive the output stages in UL mode. The chassis is black walnut with a strip of lacewood inlay for contrast. Power level is only 1 watt per channel calling for high sensitivity loudspeakers. The input sensitivity for full output is a little over 1v peak so this amp can be driven by just about any MP3 or CD player or even a simple line level input.

Matt Renaud
Pacific Northwest, USA

Project Thread: Micro-power UL - The Amp that Never Ends
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KT88-Push-Pull-Vacuum-Tube-Hi-Fi-Amp.jpgKT88 Push-Pull Tube Amplifier with 12SL7 Driver2329 viewsKT88 Push-Pull Tube Amplifier with a 12SL7 Driver stage and a 6NO30 thermal delay relay tube. The amplifier is build following Bruce's 12SL7 SRPP / KT88 Push-Pull DIY Tube Amp build. The power tubes are new production KT88 Gold Lions made by Genalex.
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Audio-Note-Jinro-Integrated-211-Tube-Amplifier.jpgAudio Note Jinro Integrated Tube Amp (SE 211)2312 viewsAudio Note Jinro Integrated Tube Amplifier on display at the 2011 Salon Son & Image show in Montreal.

Tubes: 2 x 5R4WGB, 2 x 211, 1 x ECC82 (or 5814a), 1 x 7044 (or 5687).

Power: 18Wpc into 8ohm @ 5% THD.
Weight: 85lbs
Cost: $26,500
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E88CC-SV83-SET-Amplifiers.jpgDual SV83 SET Amplifiers2308 viewsA mirrored pair of SET amplifiers, presently being used in bridged mode. All P2P construction using silver solder. I included a "Hazen grid" capacitor and input tube bias change switch. The single mA meter displays individual output tube bias current with a Left/Right switch. Edcor XPRW178 power transformer and GXSE10-6-8K output transformers. Upgraded caps to Jantzen Audio 1200V Z-Superior. Upgraded resistors to PRP PR9372 Audio for metal film and TAKMAN REX for carbon film. ALPS Blue 100K attenuator. The power supply uses a RCA 5U4GB rectifier and Hammond 156R choke. Matched pairs of Svetlana SV83 for power and JJ E88CC for the input tube.

Billy Whiten - Georgia, USA
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SAR-Labs-STA80-KT88-PP-Tube-Amp.jpgSAR Labs STA80 KT88 Tube Amp2305 viewsShot of a Scientific Audio Research Labs (SAR Labs) STA80 tube amplifier over at Fred's place (April 2010). The tube compliment was 12AT7, 12BH7 (I think) and JJ KT88 Blue Glass tubes. About 55-65W and very nice sound.
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OatleyPhonoPreFinisS.jpgMongrel Dog Audio JAN6418 tube phono preamp2302 viewsThis is a new tube phono preamp kit from Oatley Electronics based around the JAN 6418 sub-miniature pentode tubes. The phono preamp kit has been housed in a cast aluminum enclosure with a Hammered Copper finish. Inside the enclosure bitumanised aluminum foil lines the lid and top. Gold RCAs grace the back. The sound reproduction is full bodied with deep bass, bright mids and highs. This phono preamp may out perform my OPAMP unit.

There are more details about my experience with this inexpensive little phono preamp amp kit on the 6418 Tube RIAA Stereo Phono Preamplifier Kit project page.

Mark Houston
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tube_amplifier.jpg5692 / 8417 SE Tube Amplifier2302 viewsThis amplifier was built to reproduce music playback with high fidelity. The sound is light and natural. One doesn't get tired of listening to it for many hours. The voice sounds softly and naturally without tension. The amplifier has great microdynamics. The preamp is built based on tube 5692. The power amplifier uses tubes 8417. The tubes can be replaced with different ones: 6L6, 6L6GC, KT88, 6V6 and alike. In this case, the current of the output tubes can be tuned. The output transformers are Hashimoto HC-507U 5K. For more pictures, please visit http://alexkap.com
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SE-EL34-Signature.jpgEL34 Signature - SE - Mark2298 viewsThis amp is my new EL34 the "retro-34UL", Signature EL34 amp. Valve compliment is NOS Svetlana EL34 and Svetlana 6N1P. Edcor GXSE 6 ohm ultra-linear audio output transformers, the 10H choke and power transformer are Hammond. Inter-stage capacitors are Jensen copper, paper and oil with pure silver leads. Biploar capacitors are used as bypass caps on the EL34 with ceramic sockets to hold the audio tubes. The rectifier valve is a Golden Dragon 5U4. The audio output transformers are rubber mounted. The top plate of the amplifier chassis is ABS plastic and base is Australian Spotted Gum (oiled). Feet are filled with lead sinkers and rubber glue, silver solder and silver plated wire used throughout the build. The circuit topology is Single-Ended with Ultra-Linear operation.

Mark Houston – retro-thermionic
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TDA7294-chipamp-6N3-tube-input.jpgTDA7294 Chip Amplifer with 6N3 Tube input2294 viewsFrom a $48 printed circuit board and a bag of parts (eBay) I fashioned this very functional looking 80W amplifier. The parts include a 6N3 valve (preamp stage), two TDA7294 high performance power chips and all the parts required to populate the circuit board. You have to source the chassis, heatsinks and connectors yourself and that's where the expense starts.

The amplifier has been constructed in attractive charcoal black 2U 19" rack enclosure. Three sets of switchable RCAs on the back and 4 oz volume knob and Alps pot to control loudness. Speaker protection is included on the PCB and there is a delay (anti-thump) complete with flashing LED before the amp is ready for use. Very clean sound, holographic presentation.

For more details and impressions see the Chips and Tube - 6N3 and TDA7294 integrated amp thread.

Mark Houston – retro-thermionic
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Digital_Pictures_1_031.jpgKT77 OddWatt (Push-Pull with CCS)2293 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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PhonoTubePreampMkIIInsideS.jpgOatley Electronics K282 JAN 6418 valve phono preamp2290 viewsMy second build of the Oatley Electronics JAN 6418 valve phono preamp kit. This time no switch mode power supply and metal film resistors and better polypropylene capacitors replace the basic kit components.

For details about the upgrades I made to the basic kit, see my review of the 6418 Tube (Valve) RIAA Phono Preamplifier Kit.
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DSCN0450S.jpg6S4S & 6J9P SE tube amplifier project2289 viewsMy new single-ended class-A amplifier using 6S4S and 6J9P tubes.
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TeaBoxPreampSmall~0.jpgTwinings Tea Box 12AX7 Tube Preamp with Remote 5Y3 PS2279 viewsThis is my second build of the Twinings Tea Box 12AX7 tube preamps with separate 5Y3 valve rectification. Others I have built used an internal or remote SMPS. This build used the massive and expensive Jensen copper, paper and oil caps. Silver wire, WBT silver solder, Solen Teflon caps (feedback) component-2-component wiring make this an exceptional build. There is no cct. brd. A remote PS with valve rec. (Ozzie 5Y3) and Hammond power transformer and 12H choke provide very clean robust power to the preamp Tea Box.

The sound is very 3D with sound stage deep and wide. The full passion of the music comes through with staggering detail making most instruments (acoustic anyway) sound very different. This build has been commissioned by a very astute audiophile in Denver, Colorado. I know he will be pleased. It goes with well used AWA (Amalgamated Wireless Australasia) 12AX7 valves, rare but sweet sounding.
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