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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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12AX7-Tube-Preamp-5AR4-Power-Supply.jpg
12AX7-Tube-Preamp-5AR4-Power-Supply.jpg12AX7 Tube Preamp with 5AR4 Tube Power Supply2878 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.
KT77-CCS-Push-Pull-Tube-Amp.jpg
KT77-CCS-Push-Pull-Tube-Amp.jpg6SL7 / KT77 Push Pull (PP) Tube Amplifier2852 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.
DSCN0061_M1~2.jpg
DSCN0061_M1~2.jpgMy Black Velvet OTL headphones amplifier 2846 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.
a1little1.jpg
a1little1.jpg6V6 12AX7 Stereo Amp2833 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.
Blue_Velvet_Pre_Night_shot.jpg
Blue_Velvet_Pre_Night_shot.jpgBlue Velvet Tube Preamp - Night Shot2827 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 Preamp2823 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 )
DIY-SE-Class-A-Mosfet-Amp.jpg
DIY-SE-Class-A-Mosfet-Amp.jpgClass-A 2SK1058 Renesas Mosfet Single-Ended Amp in Heatsink Enclosure2820 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
KitAmpUnderSmall.jpg
KitAmpUnderSmall.jpgKT88 SE UL tube power amp - underside2816 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.
6C33C-SE-Amp-Don.jpg
6C33C-SE-Amp-Don.jpgSingle-Ended 6C33CC Tube Amp with 6SL7 driver2805 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
Dynaco-MKIII-Copper-Steam-Deux.jpg
Dynaco-MKIII-Copper-Steam-Deux.jpgDynaco MKIII - DEUX2793 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
4SUTea_I_retro.jpg
4SUTea_I_retro.jpg4SUTea - Super Simple Single Stage (4S) Tube preamp2791 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
DIY-Two-Way-Speaker-VoXDeuX.jpg
DIY-Two-Way-Speaker-VoXDeuX.jpg2785 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
12inch-60L-DIY-Subwoofer.jpg
12inch-60L-DIY-Subwoofer.jpg12-inch 60L Subwoofer2785 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
PDC400s.JPG
PDC400s.JPG$50 Teac PDC400, as good as a $700 NAD C5422779 viewsOf course in its day this five CD player with four times oversampling and dual DACs would have cost a lot more than $50. But from a secondhand store, in a sleepy fishing village in southern Australia, this was a real steal! It has removable cover and hinges. No remote. And it works 100% flawlessly and is in excellent condition. Seen here with my headphone driver and ATH-AD700 headphones. I obtained two identical CDs and identical cables and put both the NAD and Teac through an A/B switch.Queued both CDs perfectly and switched from NAD to Teac repeatedly to try to resolve which played better. There was absolutely nothing between the two. The Teac performed as well as the NAD in every area. I have been told that if Teac went to the trouble of installing dual DACs it would definitely be a good player. I have about thirty hours of play on it in a very short time and it delivers clear and detailed music and works very well with my 2N3055 based headphone driver. Yes, a real steal!
Beyma-12XA30Nd-Speaker.jpg
Beyma-12XA30Nd-Speaker.jpgBeyma 12XA30Nd Speaker2776 viewsThese are the most expensive speakers I have made. Drivers are Beyma 12” with a titanium\polyester concentric 2” dome – 12XA30Nd. Efficiency is 98db\1W\1M for the woofer section and 105db for the tweeter. The drivers can handle 700W! Box is 33ltr and heavily braced with 4” rear port. Finish is heavily stippled and applied with a roller. Xover is at 2KHz. Bass is not super low and requires a subwoofer for better bass. Speakers work extremely well with my 0.5W 1920s tubed amp. See the forum thread Beyma, a Spanish coaxial driver for more information.

Mark Houston – retro-thermionic
Amp1.jpg
Amp1.jpgPush-Pull 6P3S-E & 6N2P (OddWatt)2774 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-OddWatt-and-ForeWatt-Preamp.jpg
KT88-OddWatt-and-ForeWatt-Preamp.jpgKT88 OddWatt Tube Amp and 5751 ForeWatt Tube Preamp2771 viewsWooden enclosures for a pair of Bruce's KT88 OddWatt Tube MonoBloc Amplifiers. Between the two mono amps is a new project - a 5751 (SRPP) ForeWatt tube preamplifier. The KT88 tubes are JJ / Tesla KT88 Blue Glass.
C3m-Tube-Preamp-Menatzchim.jpg
C3m-Tube-Preamp-Menatzchim.jpg"Menatzchim" - C3m Tube Preamplifier2767 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
IMG_1960.JPG
IMG_1960.JPGMini 12AU7 Tube Preamp2766 viewsAnother picture of the 12AU7 tube preamp close up showing the input/output plugs on the side. The preamp got its name from being nearly impossible to wire the internal parts because of the small case.
KT88-Monoblock-Tube-Amplifiers.jpg
KT88-Monoblock-Tube-Amplifiers.jpgDIY Monoblock KT88 Push-Pull Tube Amplifier Kits2764 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.
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