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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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VTR-ST60-Tube-Amplifier.JPG
VTR-ST60-Tube-Amplifier.JPG VTR ST60 Tube Amplifier2926 viewsVTR ST60 tube amp. Just bought this one. Sounds great and has a very good bottom end, unlike the others. Uses SED 6550 (I’ll be replacing them with gold lions KT88 soon).
12AX7-Tube-Preamp-5AR4-Power-Supply.jpg
12AX7-Tube-Preamp-5AR4-Power-Supply.jpg12AX7 Tube Preamp with 5AR4 Tube Power Supply2920 viewsTwinings Tea Box preamp with external valve rec. PS

Another Tea Box valve preamp but this time with a valve rec. remote PS. The rectifier valve is a 5AR4. The iron consists of a Hammond power transformer and 10H choke. Golden Dragon tubes are used in the 12AX7 Tube Preamp . The preamp uses silver hook-up wire, Alps Blue Velvet attenuator, brass cones and 4oz brass knob. Jupiter hand made beeswax caps are used in the amp modules and silver solder throughout. The sound stage has gained greater dimension and detail has improved over my SS preamp.
BillsAmps.JPG
BillsAmps.JPGBills Cymer valve monoblocks2912 viewsThese valve monoblocks deliver as well as they look. The sound from the complete system was natural and authoritative. Expensive but nice.....
DIY-SE-Class-A-Mosfet-Amp.jpg
DIY-SE-Class-A-Mosfet-Amp.jpgClass-A 2SK1058 Renesas Mosfet Single-Ended Amp in Heatsink Enclosure2912 viewsThis is a build of Mark Houston's DIY Class-A 2SK1058 MOSFET Amplifier which was built without circuit board in order to have the shortest connections as possible and to meet the tradition of valve amps. The heatsinks of the fanless enclosure are heating up to little more than 40° C

Stefan - Germany
DIY-6AS7-Tube-Headphone-Amplifier.jpg
DIY-6AS7-Tube-Headphone-Amplifier.jpgDIY 6AS7 Tube Headphone Amplifier2908 viewsMy name is Laurie. I have been building and DIYing for 45 years now and happily will never stop. This tube headphone amp is from a thread in the Form.

The power connecting cable comes from a European Travel Iron I bought for $1.00 at junk shop. (220v/6A) They will be shortened when I find a perch for the amp and me. The sound is better than my ears have ever heard so I will be keeping this one for my retirement entertainment should such a time ever come. Wink It has worked from day one and continues to please me every time it is turned on. The tubes are JJ ECC88 / 6AS7 with a 5V4 rectifier tube. To spite it's small size the parts are quite easily accessed. I over built most components so it will outlast me I fear. The only change I anticipate may be the 6AS7 to a bottle neck glass to match the rectifier tube. I do have and use a 6080 tube, but i can tell no difference in sound. It will take more then a few hours of listening to get my ears better tuned.
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DSCN0061_M1~2.jpgMy Black Velvet OTL headphones amplifier 2892 views6AS7G RCA & Rare RV200/600 Tungsram-Germany & PCC88 Siemens /golden pins/
OTL for headphones 200 and more ohms. Loftin-white, only 1 cap ELNA between output stage and headphones.
KT77-CCS-Push-Pull-Tube-Amp.jpg
KT77-CCS-Push-Pull-Tube-Amp.jpg6SL7 / KT77 Push Pull (PP) Tube Amplifier2887 viewsFront view with cage of the Oddwatt 225, a 6SL7 SRPP / KT77 SIPP (Push-Pull) DIY Tube Amplifier. 6SL7 SRPP driver stage with KT77 PP output stage. Cathode constant current sources are made using LM317 Regulators.
6C33C-SE-Amp-Don.jpg
6C33C-SE-Amp-Don.jpgSingle-Ended 6C33CC Tube Amp with 6SL7 driver2885 viewsTake a look at Don’s new single-ended 6C33C amp. The top plate is ABS plastic, the wood base is Australian Spotted Gum. There is a power transformer for the HT supply and a toroid for the 6C33C heaters. Two chokes are used to split the HT into two seperate PS channels. This is a three stage amp with 6SL7 driver tubes. The two 6SL7 triodes are linked with a cap but the second triode drives the power tube direct. Each power tube will run up to 220mA but even at 150mA the power tranni gets real hot. Don’s work is ultra neat but I had to correct all the wiring around the 6SL7 for him to get the amp to go. It sounds absolutely fabulous. Has to be Don’s best tube amp build to date.

Mark Houston – retro-thermionic
12inch-60L-DIY-Subwoofer.jpg
12inch-60L-DIY-Subwoofer.jpg12-inch 60L Subwoofer2878 viewsThese 60ltr sub-woofers were built to complement my 2-way speakers "VoXDeuX". The drivers are 12" polycones with a free air resonance of 25 Hz. In the box they go down to 31 Hz where they are very active. The drivers are very efficient and are being powered by a compact 50W Class-D amplifier. A stereo feed is taken from the preamp and passed through an electronic filter. The filter has a -3 dB point of 52 Hz and but employs only a -12 dB slope. The internals of the box comprise of six vertical braces. Bitumanised heavy Aluminum foil covers most surfaces. Pockets and chambers are formed at the rear by the bracing which carries additional dampening. These are then covered by a single layer of damping.

Mark Houston – retro-thermionic
a1little1.jpg
a1little1.jpg6V6 12AX7 Stereo Amp2874 viewsLittle stereo vacuum tube amplifier built for a friend who wanted a tube stereo at minimal cost. It used mainly parts on hand, including a vintage radio power transformer, vintage tube sockets, and NOS 5 watt Zenith audio output transformers made for 6V6 single-ended output stages. The driver tube is 12AX7 and the tube rectifier is 5Y3G. Output tubes are old Zenith 6V6G tubes, the tall ones that look prettier than the GT style. The tube amp delivers great sound with an MP3 player as the audio source.
DIY-Two-Way-Speaker-VoXDeuX.jpg
DIY-Two-Way-Speaker-VoXDeuX.jpg2872 viewsUsing inexpensive components from the local electronics shop I constructed these small bookshelf two-way speakers. They comprise a 5” paper cone mid-woofer and dampened silk done tweeter. On the sides and back is wide internal vertical bracing and bitumanised heavy aluminum foil. This forms bass chambers within the box to control rear reflection. The passive crossover sits external to the speakers and is a Linkwitz-Riley 2nd order with a crossover point set at 3 kHz. The boxes and crossovers are bi-wired using Cat5 cable from the amp to driver. They sound excellent for an AU$350 build.

For more info, see the Simple and Cheap Two Way Speakers thread in the forum.

Mark Houston – retro-thermionic
Blue_Velvet_Pre_Night_shot.jpg
Blue_Velvet_Pre_Night_shot.jpgBlue Velvet Tube Preamp - Night Shot2869 viewsThis is my second audio DIY project. A Blue Velvet Preamplifier. Picture taken in the dark.
12AX7-ECC83-Tube-Preamp.jpg
12AX7-ECC83-Tube-Preamp.jpg12AX7 / ECC83 Tube Preamp2860 viewsHi, I have built preamp with double triode 12AX7 from your web site.

The sound of this preamp is very very nice, detailed and realistic.

Pipa (from Czech Republic )
Dynaco-MKIII-Copper-Steam-Deux.jpg
Dynaco-MKIII-Copper-Steam-Deux.jpgDynaco MKIII - DEUX2859 viewsHere is a photo of my latest build. I call it the DEUX.

These are Dynaco MKIII's with the VTA octal Driver upgrade. I hardwired the driver circuit to avoid using the PC boards under the hood. The bases are made from walnut, and the top plate is 1/8" copper. The bolts are 3/4" brass.

More photos and construction shots here: http://blog.coppersteam.com/steampunk-art/deux-final/

Mike Cochran
Key West, Florida. USA
KitAmpUnderSmall.jpg
KitAmpUnderSmall.jpgKT88 SE UL tube power amp - underside2858 viewsThe underside of a KT88 SE UL power amp consists of, Edcor XSE series OPT, Hammond 10H choke, rectifier unit with SF diodes and 200uF of filtering. Turret boards were used for the KT88 sockets (ceramic), cathode resistors and bypass caps. All other components are wired, point-to-point, on a smaller circuit board X2 caps are used for the coupling caps. All component are inexpensive and readily available. The amp suffered from hum until the filter caps were increased. 100uF before and after the choke are required. The PS delivers a very quiet 410V. 30V is dropped across the cathode resistors which provide the biasing to the power tubes. At idle 63mA is drawn per tube. The sound is extended and detailed with a 6W delivery. Excellent sound stage depth. Frequency range is from 35Hz to 46kHz (-3dB points).

The amplifier follows the Single-Ended (SE) KT88 Tube Amplifier Schematic by Mikael Abdellah.
4SUTea_I_retro.jpg
4SUTea_I_retro.jpg4SUTea - Super Simple Single Stage (4S) Tube preamp2847 views4SUTea is another Super Simple Single Stage (4S) Tube preamp that I have built. This one features single board construction with PS and amplifier together and no PCB. All housed in a Twinings timber Tea Box: Bitumanised aluminum foil controls enclosure resonance and Russian paper in oil caps link the modulated HT to the real world. Silver solder is used throughout. Heavy duty high grade gold plated RCAs grace the back and all is powered by a 24V 1A plug pack. There are two switchable inputs, Alps blue velvet pot and black chromed solid brass knob.

See the project page 4S Universal Preamp for 12A?7 Valves.

Mark Houston (Australia)
retro-thermionic
mwhouston: retro-thermionic
Amp1.jpg
Amp1.jpgPush-Pull 6P3S-E & 6N2P (OddWatt)2827 viewsUL, cl.A /Ia=51 mA for each 6P3S-E tube. Schematic follows the idea of the KT88 push-pull Oddwatt design. /thanks Bruce/. Audio Output transformers are Hammond 1650, with triode and UL modes and output for 8 and 4 ohms, rated "HiFi" bandwith 20-20000Hz +/ - 0 dB!!
KT88-Monoblock-Tube-Amplifiers.jpg
KT88-Monoblock-Tube-Amplifiers.jpgDIY Monoblock KT88 Push-Pull Tube Amplifier Kits2824 viewsShown in the photograph are a pair of DIY Monoblock KT88 Push-Pull Tube Amplifier Kits. See the review for additional details of this great sounding tube amp kit. Also shown in the photo is a NAD C521i CDP used a transport and a Behringer SRC2496 which is being used as an up-converting DAC. The little black box is a DIY Lightspeed (optocoupler) Attenuator.
6N7-Tube-Preamp-Heavy-Metal.jpg
6N7-Tube-Preamp-Heavy-Metal.jpg6N7 tube preamp (Heavy Metal)2822 viewsConstruction is in a timber box. There are three switchable RCA inputs and power is supplied by an external 18V 2.2A AC power pack. Internally 255V is developed with a linear PS and regulated 12VDC for the heaters which are wired in series.

An Alps blue velvet potentiometer is fitted at the output for attenuation control with a fine solid brass knob to compliment the gold right-angle RCA jacks, name plate and ventilation holes. Wire wrap wire is used in the signal path. The power supply and amplifier are on separate circuit boards. Bitumanised heavy aluminum foil is used to line sections of the timber box for resonance control.

For more info, see the 6N7 metal tube preamp thread on the discussion forum.

Mark Houston – retro-thermionic
C3m-Tube-Preamp-Menatzchim.jpg
C3m-Tube-Preamp-Menatzchim.jpg"Menatzchim" - C3m Tube Preamplifier2821 viewsThis C3m tube preamplifier uses the same power supply I have used in my last dozen preamp builds. An external 24VAC 1A wall wart is stepped up to 250VAC by using a step down transformer backwards. Double filtration and a DC filament supply ensure a dead quiet preamp. Wire wrap wire is used for signal hookup wire and heavy duty gold plated RCAs are employed. No shielded wire or PCB is used. An Alps blue velvet pot is on the output for attenuation. Jensen Copper, paper and oil caps with silver leads are used on the output. Three sets of input RCAs are selected by two small power switches.

The sound stage is extremely deep and voice and instruments have a uncanny natural sound and feel about them. With symphonic pieces you get the unnerving feeling you are in row twelve and right in the center. I would highly recommend the construction of this preamp.

For more info, see the C3m preamp thread on the discussion forum.

Mark Houston – retro-thermionic
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