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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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tube_amplifier.jpg5692 / 8417 SE Tube Amplifier2647 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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TeaBoxInsideSmall.jpgTwinings Tea Box 12AX7 Tube Preamp with External 5Y3 Power Supply2643 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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PhonoTubePreampMkIIInsideS.jpgOatley Electronics K282 JAN 6418 valve phono preamp2642 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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Club191207.jpgLast Audio Club Meet for 2007 - Melbourne, Australia2635 viewsTaken with a camera phone the Melbourne Audio Club last meet of the 2007 year is DIY night. You can tell by the array of equipment there was plenty of participants. A Great night.
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Digital_Pictures_1_031.jpgKT77 OddWatt (Push-Pull with CCS)2635 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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KT88-Push-Pull-Vacuum-Tube-Hi-Fi-Amp.jpgKT88 Push-Pull Tube Amplifier with 12SL7 Driver2634 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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OatleyPhonoPreFinisS.jpgMongrel Dog Audio JAN6418 tube phono preamp2624 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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Push-Pull-6F6S-286F629-Tube-Amp-with-ECC82-driver.jpgPush-pull 6F6S (6F6) Tube Amplifier with EСС82 input2613 viewsPush-pull 6F6S (6F6) amplifier. The input stage is an EСС82 with a large anode. The amplifier has been built into an old HP 5.25" floppy drive (fantastic steel!!!).

The input stage is made by Williamson, after the phase shifter with a split load and paper-in-oil capacitors. Displacement of the output stage is automatic, inclusion of a pure pentode. The amplifier operates in pure class-A. The output stage can be used with 6P6S and 6V6 tubes without any changes. There is no feedback used in this amp. The cathode resistor of preamp halves EСС82 are NOT capacitor shunted. The input connectors are Amphenol BNC and the output contacts are from an old laboratory equipment HP.

With best regards,
Rakhmanov Ilya (Рахманов Илья), Moscow, Russia.
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Digital_Pictures_1_006.jpgKT77 Push-Pull Tube Amp (OddWatt)2607 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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Voxativ-Ampeggio-Back-Loaded-Horn-Speaker.jpgVoxativ Ampeggio Back Loaded Horn Speaker2606 viewsThe Voxativ Ampeggio Back Loaded Horn Speaker on display at the 2011 Salon Son & Image show.

The Ampeggio uses the Voxativ AC-3X and the sensitivity is 101 dB / 1w / 1m.

For more information see the Voxativ Ampeggio Horn Speakers - SSI 2011 show report.
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OddWatt-KT77-Push-Pull-Tube-Amp-Kit.jpgOddWatt / OddBlocks KT77 Push-Pull Tube Amp Kit2605 viewsA photograph of a finished OddWatt / OddBlock KT77 Push-Pull Tube Amplifier Kit. The KT77 tube amp kit is available from OddWattAudio.com. The kit comes with a NOS JAN Philips Branded 5751 (US made) and new production JJ branded KT77 tubes (Russian made).

Complete instructions to build a similar DIY version of the amp are available on the Oddwatt 225 - 6SL7 SRPP / KT77 SIPP (Push-Pull) Tube Amplifier project page.
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BeBampDriver6SN7s.jpgBe Bamp 6SN7 remote driver stage2591 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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TeaBoxPreampSmall~0.jpgTwinings Tea Box 12AX7 Tube Preamp with Remote 5Y3 PS2587 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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6T9-Tube-Amp-Front.jpg6T9 Hi-Fi Tube Amplifier Project2575 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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PinotAssembleIISS.jpg6AS7 SET amplifier with JAN 5R4 rectifier tube2573 viewsThis compact amp is based on an 6AS7 (dual triode), JAN 5R4 (both coke bottle) and 12AX7 driver tube. The top plated is sprayed to match the Edcor OPTs (1.7k/8ohm). The base is solid Mirbeu. Power transformer is Hammond and so is the choke. Component-2-component wiring with no PCB. Silver wire connects gold RCAs to the driver tube. Jensen (0.22uf 630V) copper paper and oil caps join the driver and power stages. The 6AS7 are pushed to 13W dissipation. Bass is heavy and extended, mids and treble highly detailed and sound stage very deep and defined. An extremely good looking and great sounding amp.

Additional information is available in the 6AS7 tube amp from layout to listening forum thread.
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la2a.JPGteletronics la2a DYI clone2570 viewsThis a studio compressor / limiter using a opto-coupler clone. Parts are original NOS UTC transformers and opto with NOS tubes and Sovtek with Hammond power transformer.
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Jan6418JewelBox.jpgRaytheon JAN6418 sub-mini valve preamp in a Jewelery box2567 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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Listening-Room-Nikola-Azazello.jpgNikola's (Azazello) Tube Listening Room2566 viewsPhotograph of my tube amplifier in my listening room.

From left to right on the shelf:
SE 6Ф3П
SE 2A3 RCA
OTL 6AS7
EL11 Telefunken
PP 6П3С (variant of Leibowitz circuit)

From left to right on the floor:
PP 6005 - variant Leibowitz
SE 300B JJ
SE 6С4С
SE EL11 Tungsram
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6EM7_Single_Ended_Triode_Amplifier.jpg“Paris” – 6EM7 Dual Mono Integrated Amplifier2564 viewsWhat started as a forum thread discussion (6EM7 power amp) ended in the construction of a 6EM7 (Sylvania tube) integrated triode amplifier. I used dual mono construction with two power transformers, two 5Y3 rectifier tubes and two separate power filter stages but with a shared single stage preamp. There is a single EMI/RFI power filter feeding both power supplies. Two chokes and two 15W Edcor audio output transformers are in the base of the enclosure. An Alps blue velvet pot after the preamp stage (4S Universal) controls volume to the power amp section. The colour is Sungold and the base Mirbue. The amp has a very detailed mid-range and produces about 2W.

Mark - retro-thermionic
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KiSharnS.jpgretro-thermionic Pinot "KiSharn" SET 6AS72552 viewsThough only a small difference between this photo and the last the Pinot "KiSharn" continues to impress and compete well against commercial amplifiers costing AU$5K. I am now running it with SED Wing “C” tubes which look and sound very close to the United Electronics tubes it started with. An audibly impressive amp which belies its functional simplicity.
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