DIY Audio Projects Photo Gallery
 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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DSCN0084s.jpg
DSCN0084s.jpgSE RCA 2A3 Triode Tube Amp2288 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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KT88-Push-Pull-Vacuum-Tube-Hi-Fi-Amp.jpgKT88 Push-Pull Tube Amplifier with 12SL7 Driver2277 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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Push-Pull_6L6_Tube_Amplifier.jpgPush-Pull 6L6 Tube Amplifier2271 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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SynergyII-Cu-LM3875-Gainclone.jpgSynergyII\Cu - LM3875 Gainclone2264 viewsSynergyII\Cu started with 3.6kg of 100% very thick copper plate. The enclosure was selected, a 1U, 19" rack mount. The challenge was to build a pure Gainclone with its three resistors and simple 1500uF storage capacitors in a compact 1U enclosure. Everything had to fit in this tiny space including two 48VAC toroidal transformers for the dual mono supply, The LM3875 amplifier weighs 9.6 kg. The sound is clear, clean and solid with bass extended and very controlled.

See the original Synergy LM3875 Gainclone Amplifier (Chip Amp) project page.

Mark Houston – retro-thermionic
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parallel-6C33C-tube-power-amplifier.jpgDon's parallel 6C33C tube power amplifier2257 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 Amp2248 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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OatleyPhonoPreFinisS.jpgMongrel Dog Audio JAN6418 tube phono preamp2247 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 Amplifier2240 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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Digital_Pictures_1_031.jpgKT77 OddWatt (Push-Pull with CCS)2239 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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6EM7-Tube-Power-Amp-Arabella.jpgArabell - 6EM7 Tube Power Amp2236 viewsInspired by a beautiful Acacia, heavy, chopping board I fashioned this excellent sounding single-ended 6EM7 tube power amp (Arabella). To hide wiring a shallow aluminum skirt is tucked up underneath. Smaller components also reside here. Larger power supply caps are housed in a “trunk” at the back where the RCAs and gold plated speaker binding posts are also located. Tubes are Dutch made AWA NOS and Sovtek 5Y3. A large Hammond power transformer (370EX) and Hammond 20H 100mA choke (193C) grace the gorgeous wooden top plate. Edcor GXSE (GXSE10-6-5K) audio output transformers stand proud and blue to give this build a striking look and super clean pure sound. I love the amp for its looks and sound, all 2.5W of it.

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.
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TeaBoxPreampSmall~0.jpgTwinings Tea Box 12AX7 Tube Preamp with Remote 5Y3 PS2232 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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PhonoTubePreampMkIIInsideS.jpgOatley Electronics K282 JAN 6418 valve phono preamp2230 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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Audio-Note-Jinro-Integrated-211-Tube-Amplifier.jpgAudio Note Jinro Integrated Tube Amp (SE 211)2229 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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SAR-Labs-STA80-KT88-PP-Tube-Amp.jpgSAR Labs STA80 KT88 Tube Amp2227 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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Jan6418JewelBox.jpgRaytheon JAN6418 sub-mini valve preamp in a Jewelery box2220 viewsNot much to see here except to note this is an extremely "pretty" jewelery box of the timber variety. The box was reduced from $60 to $30 and this purchase prompted me to build the preamp. I like my pretty and cute enclosures. See other images for more detail. The preamp modules are part of a kit from Oatley Electronics Australia but many parts have been upgraded. The back holds a brushed Aluminum bar with the input/output RCAs and power switch. Should battery voltage fall below 6.8V (two lithium 9V batteries power the unit) a led on the cct. brd. will light. Lifting the gold catch and taking a look will disclose this.

The box is heavy and the wood thick and the Makassar timber pattern on the lid makes this a stunning enclosure, especially if you are bored with putting your creations into plain tin boxes. The preamp plays well but the tubes take a few hours to burn in so be warned.

Full details and variations to this tube preamp kit are available on the JAN6418 Valve (Tube) Preamplifier Kit page.
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DSCN0450S.jpg6S4S & 6J9P SE tube amplifier project2214 viewsMy new single-ended class-A amplifier using 6S4S and 6J9P tubes.
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BeBampDriver6SN7s.jpgBe Bamp 6SN7 remote driver stage2211 viewsThis is the second of the remote driver stages for the Be Bamp . It uses one 6SN7 on a cast aluminum chassis with a epoxy enamel paint. The finish is Hammered Copper. Again the Russian military caps of foil, paper and oil will be used as the inter-stage caps.

Wire will be cotton coated tinned copper and all silver solder. Socket is ceramic and the tube will be running on 350V HT+.
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Digital_Pictures_1_006.jpgKT77 Push-Pull Tube Amp (OddWatt)2209 viewsEven KT77s reach temps of around 225F Good bright heaters too. From rparsh.
Schematics are on the KT77 Push-Pull Tube Amplifier project page.
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Philips_EL6431_Amplifier.jpgPhilips EL6431 Amplifier2208 viewsClose up photo a vintage Philips vacuum tube amplifier which I rebuilt. The Philips EL6431 uses four EL34/6CA7 tubes to obtain an output power of around 120 watts into an 8 ohm speaker.

For more information and photographs about my Philips EL6431 amplifier rebuild see the 120 watt Philips EL6431 Tube Amp forum thread.

Alan (Canada)
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6T9-Tube-Amp-Front.jpg6T9 Hi-Fi Tube Amplifier Project2207 viewsDIY build of a single-ended 6T9 Tube Amplifier using the PCBs from Spare Time Gizmo. The power and audio output transformers are from Edcor. Mark's 6T9 ultra-liner tube amp modifications were used.
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