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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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6V6-Push-Pull-Amplifier.jpg
6V6-Push-Pull-Amplifier.jpgPush-Pull (PP) 6V6GT Tube Amplifier2989 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

PhonoFront.JPG
PhonoFront.JPGPhono Preamp Kit with RIAA Equalization2986 viewsAfter resurrecting the Rega TT and RB300 tone arm with a Grado Sonata wood body cartridge I went on the hunt for a phono preamp. The Pro-Ject PhonoBox SE preamp was a value for money purchase, a neat and good sounding unit. This phono premp kit cost under $AU100 to build (including AC adapter) and challenges the Pro-Ject on a the sonic level. I can find no fault musically with the kit which has no hiss or hum and a natural sound quality. It is available from Jaycar Australia. Better than the Pro-Ject by provide the facility to have three different selectable compensations including RIAA and early DECCA (ffrr) and a host of others to select from. And to go one step better again there is a gain control to balance between CD and phono input levels. The case is ABS plastic and tar and foil lined. Gold RCAs used (see other photos). A +/- 12V regulated PS is include on the one peace cct. brd. The PS is shielded. Distortion is rated at .014% and RIAA accuracy is better than 1db. Signal to noise is -84dB.
OddWatt-KT88-Push-Pull-Tube-Amp-Kit.jpg
OddWatt-KT88-Push-Pull-Tube-Amp-Kit.jpgOddWatt / OddBlock KT88 Push-Pull Tube Amp Kit2983 viewsA finished OddWatt / OddBlock KT88 Push-Pull Tube Amp Kit. This KT88 tube amplifier kit can be purchased from OddWattAudio.com. The tube amp kit comes with a NOS JAN Philips Branded 5751 (US made) preamp tube. The output tubes are and new production Genalex Gold Lion branded KT88 tubes (Russian made). As you can see, the power and audio output transformers are from Edcor.

Complete DIY instructions to build the similar OddBlocks 12SL7 SRPP / KT88 SIPP (Push-Pull) Tube Amplifier are also available.
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PreProduction-Odd-Block-Tube-Amps.jpgOddWatt / OddBlock KT88 Push-Pull Tube Amp Kit2980 viewsThis is a pre-production photo of the OddWatt / OddBlock KT88 Push-Pull Tube Amplifier kits that are available from OddWattAudio.com.

Full details of the tube amplifier topology along with complete DIY instructions are available on the 12SL7 SRPP / KT88 SIPP (Push-Pull) DIY Tube Amplifier project page.
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PhonoRear.JPGDIY Phono Preamplifier Kit2974 viewsThe finished kit (see other photos) can be assembled in an afternoon. I used insulated gold plated RCAs but on an ABS plastic case like this insulated RCAs are not required. Keeping all connections on the rear makes for a simple front panel with gain control and recessed red led. I used thick silicon stick-on feet to ensure vibration into the unit is kept to a minimum. Stick down computer stand-off hold the cct. brd. to the bottom of the case and also help with vibration control. The case is lined with heavy sticky tar and foil. Base, sides and lid and are lined but not earth. This helps with shielding the low voltage levels and case dampening also. Shielded wiring is used internally and silver solder used throughout.
KitAmpTopSmall.jpg
KitAmpTopSmall.jpgKT88 SE UL Tube Power Amplifier2972 viewsI had put the partially finished amp in the gallery some weeks back. Now finished not a lot of difference on the outside except for the many silver colored screws on the top plate and some feet. See the other image for the underside shot. After a number of hours of careful listening and listening to it though others CD players, pre-amps and speakers I can say that most liked the sound. SE tube amps produce absolute and exquisite mid-range and silky highs and deep sound stage but this amp has a slightly narrow sound stage presentation. Bass improved and hum vanished with additional PS filter caps. With a brushed Al top plate and Mirabue timber thick timber base, Edcor XSE OPTs and component-2-component wiring on all circuit boards (including rectifier broard) this amp represents a clean and easy build with in-expensive parts. Though low powered (6W+) for a few hundred dollars you can experience the benefits of a tube SE UL design. So easy, so nice!

Here is a link to the KT88 Single-Ended (SE) Schematic I followed.
Nagra-300i-300B-Integrated-Amplifier.jpg
Nagra-300i-300B-Integrated-Amplifier.jpgNagra 300i Integrated Tube Amplifier (300B)2967 viewsThe new Nagra 300i Integrated 300B Tube Amplifier on display at the 2011 Salon Son & Image show.

The integrated amplifier uses four JJ 300B directly heated triodes in a push-pull configuration in class-A operation. Output power is 20Wpc.
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photo-4.jpgBob's Dynaco ST-35 with VU Meter2955 viewsTube amp using Dynaco ST-35, Edcor iron and a plasma VU meter using IN-13 nixie tubes.
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IMG_2678.JPG50EH5 / 25EH5 Tube Ampr with 12AU7 Mini Tube Preamp2949 viewsYet another picture of the 50EH5 Tube amp in action along side with the Mini 12AU7 tube preamp.
12AX7-Tube-Preamp-Kti-Bottom.jpg
12AX7-Tube-Preamp-Kti-Bottom.jpg12AX7 Tube Preamplifier Kit - Bottom2945 viewsAn underside view of the 12AX7 Tube Preamplifier Kit . The chassis was made from scrap cherry wood finished with stain and varnish. The top plate is 2mm thick aluminum, from a metal fab shop.
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mag02.jpgMagnavox 93 Series Tube Amp Rebuild2940 viewsThe cloaked and stunning 93 Magnavox 93 Series Tube Amp ready for service! For more information, see the Magnavox Stereo tube amplifier model 9304-20 rebuild thread on the forum.
Oatley-Electronics-K295-Tube-Buffer-Kit.jpg
Oatley-Electronics-K295-Tube-Buffer-Kit.jpgOatley Electronics K295 Tube Buffer Kit2927 viewsThe production version of the K295 has been cased in a bitumanised Al lined plastic plastic case. Guitar jack input and outputs are on the rear and large numbered knobs on the front. The blue led indicates "0" position of the attenuators. The preamp can be plugged directly into the mains. Good sounding and simple to build.

There is more information in the K295 stereo JAN6418 tube buffer / preamp kit thread.

Mark Houston (Australia) - Mongrel Dog Audio
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SE-EL34-Signature.jpgEL34 Signature - SE - Mark2924 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
EL84-CCS-Push-Pull-Tube-Amp.jpg
EL84-CCS-Push-Pull-Tube-Amp.jpgEL84 / 6BQ5 Push Pull Tube Amplifier2898 viewsThe "OddWatt", a EL84 / 6BQ5 Push Pull (PP) Tube Amp project. SRPP input stage and ultra linear output stage with LM317 Regulators CCS. Tube heaters are 12VDC.
Tube-Amp.jpg
Tube-Amp.jpgSV811-10 single-ended tube amp.2887 viewsRussian Svetlana SV811-10 Single Ended Monoblock tube amp.
Circuit by Eric Barbour.
See it on YouTube. @closin99
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Pre5Y3.JPG5Y3 rectifier tube and Twinings Tea Box valve preamp2883 viewsI posted an image of the finished Twinings Tea Box preamp with valve rectification then suddenly remembered why I had gone down the the valve rec. path. It is because I have a well used 5Y3G in my garrison of tubes which I wanted to employ in a project. In the original version I used a 5AR4, squat cathoded, Chinese and smart. But now the full realization of the project has come to light. This is how it was always meant to be (see earlier images for the original finish).

Some audiophiles roll their rectifier tubes to fine tune their amps. With this tube in place (and based on a short listen) I feel there is greater bass weight and slightly extended depth of sound stage. But who cares, it just looks slick, the way it was always intended.
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TDA7294-chipamp-6N3-tube-input.jpgTDA7294 Chip Amplifer with 6N3 Tube input2882 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
SynergyII-Cu-LM3875-Gainclone.jpg
SynergyII-Cu-LM3875-Gainclone.jpgSynergyII\Cu - LM3875 Gainclone2881 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
TeaBoxTopII.JPG
TeaBoxTopII.JPGTwinings Tea Box 12AX7 Valve Preamp II2879 viewsThis the second Tea Box preamp I have built. The previous 12AX7 Tea Box preamp has an external PS. This one has the PS inside the attractive timber box. Jupiter hand made beeswax caps are featured in this build. The box is lined with bituminized Aluminum foil, all silver wire and gold RCAs used throughout. WBT silver solder and an Alps blue velvet attenuator add to a quality build. The standard 12AX7s were upgraded to gold pin Golden Dragons and valve rings added. The front knob is a 4oz solid brass job the brass cones are heavy weight. The Twinings decal adds to the whole aesthetics. See the project page for more information about the 12AX7 Tube Preamp Kit.
Single-Ended-300B-Tube-Amp-MockupIIs.jpg
Single-Ended-300B-Tube-Amp-MockupIIs.jpgSingle-Ended 300B Tube Amplifier - Mockup IIs2878 viewsThis is my first 300B tube amplifier. The power supply will be separate from the amp. The tubes are $1200 rrp TJ Full Music 300B/SE carbon plates. The 6SN7 is a 50 year Treasure. The audio output transformers are 30W Hammonds. The base is Mirbeau and the top and bottom plates are 2mm thick aluminum. Signal wiring is 0.7mm pure silver wire and super heavy gold plated speaker binding posts.

For the design information see the 300B SET Design Project thread on the forum.

Mark Houston (Australia) - retro-thermionic
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