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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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MongrelChamp.jpg
MongrelChamp.jpgFender Champ 5F1 valve guitar amp.3029 viewsMy build of the Fender Champ 5F1. It is a SE three stage tube amp based on the 6V6 power valve and 12AX7 triode. The amps were first made in the late 40's up to early 80's. And re-issued in 2006. The original schematic had valve rectification. I added a 10H open choke. There are only two inter-stage caps and one by-pass cap on the 6V6 cathode resistor (not counting PS caps). I went for a Classic Champ sound by using cotton covered, single core, tinned copper wire as the hook-up wire, bees wax (Jupiter originals) inter-stage caps, an original Ozzie made 12AX7, Ozzie 5Y3 and 6V6 Black Glass (original). PS caps were increased from 8uf to 47uf and an effects loop added (between stage one and stage two). I didn't install the NFB loop from the OPT secondary to stage two. Instead I made the output stage UL (Edcor tranny). The amp is stable even when over-driven heavily. When hooked-up to a Pioneer PA 12" driver (4" Al/vented dust cover) it sounds excellent. Very clean highs and gutsy lows.
12inch-60L-DIY-Subwoofer.jpg
12inch-60L-DIY-Subwoofer.jpg12-inch 60L Subwoofer3024 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
KT88-Push-Pull-Tube-Amplifier.jpg
KT88-Push-Pull-Tube-Amplifier.jpgMonoblock KT88 Push-Pull Tube Amplifier3021 viewsPhoto of a KT88 Odd Block without the protective cage. This tube amp design will work with a number of octal tubes (KT77, 6CA7, EL34, 6L6GC, KT88, KT90 and 6550). SRPP driver stage using a 12SL7 tube. Output stage is a Class A Ultra-Linear SIPP with Gold Lion KT88 vacuum tubes. LM317 Regulators are used to provide the cathode CCS.

For more information, see the 12SL7 SRPP / KT88 Push-Pull DIY Tube Amp project page.
DIY-Two-Way-Speaker-VoXDeuX.jpg
DIY-Two-Way-Speaker-VoXDeuX.jpg3013 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
6C33C-SE-Amp-Don.jpg
6C33C-SE-Amp-Don.jpgSingle-Ended 6C33CC Tube Amp with 6SL7 driver2994 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
12AX7-Tube-Preamp-5AR4-Power-Supply.jpg
12AX7-Tube-Preamp-5AR4-Power-Supply.jpg12AX7 Tube Preamp with 5AR4 Tube Power Supply2990 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.
Dynaco-MKIII-Copper-Steam-Deux.jpg
Dynaco-MKIII-Copper-Steam-Deux.jpgDynaco MKIII - DEUX2984 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
VTR-ST60-Tube-Amplifier.JPG
VTR-ST60-Tube-Amplifier.JPG VTR ST60 Tube Amplifier2972 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).
DSCN0061_M1~2.jpg
DSCN0061_M1~2.jpgMy Black Velvet OTL headphones amplifier 2970 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 Amplifier2963 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.
BillsAmps.JPG
BillsAmps.JPGBills Cymer valve monoblocks2957 viewsThese valve monoblocks deliver as well as they look. The sound from the complete system was natural and authoritative. Expensive but nice.....
Blue_Velvet_Pre_Night_shot.jpg
Blue_Velvet_Pre_Night_shot.jpgBlue Velvet Tube Preamp - Night Shot2947 viewsThis is my second audio DIY project. A Blue Velvet Preamplifier. Picture taken in the dark.
a1little1.jpg
a1little1.jpg6V6 12AX7 Stereo Amp2945 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.
4SUTea_I_retro.jpg
4SUTea_I_retro.jpg4SUTea - Super Simple Single Stage (4S) Tube preamp2944 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
6N7-Tube-Preamp-Heavy-Metal.jpg
6N7-Tube-Preamp-Heavy-Metal.jpg6N7 tube preamp (Heavy Metal)2942 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
KitAmpUnderSmall.jpg
KitAmpUnderSmall.jpgKT88 SE UL tube power amp - underside2940 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.
12AX7-ECC83-Tube-Preamp.jpg
12AX7-ECC83-Tube-Preamp.jpg12AX7 / ECC83 Tube Preamp2928 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 )
C3m-Tube-Preamp-Menatzchim.jpg
C3m-Tube-Preamp-Menatzchim.jpg"Menatzchim" - C3m Tube Preamplifier2924 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
KT88-Monoblock-Tube-Amplifiers.jpg
KT88-Monoblock-Tube-Amplifiers.jpgDIY Monoblock KT88 Push-Pull Tube Amplifier Kits2908 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.
Amp1.jpg
Amp1.jpgPush-Pull 6P3S-E & 6N2P (OddWatt)2903 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!!
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