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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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OTL-Tube-Headphone-Amplifier.jpg
OTL-Tube-Headphone-Amplifier.jpgOTL Tube Headphone Amplifier4237 viewsThis is a picture of a tube headphone amp that I was building but gave up as I could not get it to work properly.
DIY-6s45p-300B-GU-48-Tube-Amplifier.jpg
DIY-6s45p-300B-GU-48-Tube-Amplifier.jpgDIY 6s45p / 300B / GU-48 Tube Amplifier - 125 Watts4188 viewsMy 125W tube amplifier. The input tube is 6s45p which drives a 300B and is followed by a GU-48 (replacement for the 833 tube). The 6s45p input tube is DC coupled to a 300B. There are no resistors or capacitors in the signal path. The 300B is coupled to a GU-48 tube through a step-down interstage transformer. Driver and output tubes are fixed biased for more natural and dynamic result. Output tube is working at 1000V-250mA. Amplifier gives me 125W single ended sound in class A2 mode. It has very powerful deep bass, mids are very loud and lovely. Highs are very clear. I am feeling like in concert hall. The case is made from 20mm thick African Wenge wood. Chassis is 2 mm thick electrostatic painted steel. The total weight is 50 kg.
Point_to_Point_Bride_of_Zen_Preamplifier.jpg
Point_to_Point_Bride_of_Zen_Preamplifier.jpgBoZoaC - Bride of Zen on a Cap4173 viewsAfter building a number of Bride of Zen (BoZ) preamplifiers I realised the whole circuit could be built on larger parts of itself. Here the whole BoZ circuit is constructed on the large output capacitors. The output caps are 10uF 100V polypropylene types. These were taped together along with two 1000uF of low ESR storage caps. Parts have been reduced to minimum size to keep signal path short and super glued to the rest on the cct. Silver solder and wirewrap wire is used throughout construction. There are two switchable inputs and the preamp can be powered by internal batteries (3 X 9V lithium) or an external supply. A bitumen and Al lined, non-magnetic low resonance ABS plastic case was used. Mongrel Dog Audio
12AU7-IRF510-LM317-Headphone-Amp.jpg
12AU7-IRF510-LM317-Headphone-Amp.jpg12AU7 Tube / IRF510 MOSFET Headphone Amp4164 viewsSimple headphone amplifier with a 12AU7 (ECC82) tube voltage gain stage and a IRF510 MOSFET follower stage. A 12V SLA battery is used for the power supply. A LM317 regulator is used as a CCS to bias the MOSFET into class-A operation.

See the project page: 12AU7 (ECC82) Tube / IRF510 MOSFET Headphone Amplifier
6C33C-6S33S-Single-Ended-Tube-Amplifier.jpg
6C33C-6S33S-Single-Ended-Tube-Amplifier.jpg6C33C (6S33S) Single-Ended Tube Amplifier4129 viewsMy new project, a 6C33C (6S33S) Single-Ended Tube Amplifier with 6E5P driver tubes. The power supply is contained in an external enclosure. Additional details are available in the 6C33C Tube Amplifier thread.
DIY-Vacuum-Tube-Prototype-Bread-Board.jpg
DIY-Vacuum-Tube-Prototype-Bread-Board.jpgDIY Vacuum Tube (Valve) Prototyping Bread Board4110 viewsA simple DIY Vacuum Tube (Valve) Prototyping Test Board used to test single stage tube circuits.

See the DIY Vacuum Tube Prototyping Board post for additional details.
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00003.jpgCustom PCB4090 viewsI know... its not a printed circuit board... because its not printed... but i made it with love.
You can see the rear of the LM3886 and the power cables.
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00094.jpgRectifier capacitors4077 viewsWired with the resistors, smaller caps and a cooper cable extension to make easier the soldering and assembly.
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0006sa0w.jpegOTL 6082 amplifier4046 viewsThis is my latest (work in progress) amplifier. It is a transformerless design using 6082's in the output stage. 6082's are 26.5 volt 6AS7GA's which were originally designed for series pass regulator service. More information can be found at the bottom this webpage.
http://userpages.bright.net/~geary/misc/radiohandbook.html

Steve Geary (z-strat)
50EH5-DIY-Tube-Amp-Rear.jpg
50EH5-DIY-Tube-Amp-Rear.jpgDIY 50EH5 SE Tube Amp - Rear View4027 viewsThis tube amp is based on Giovanni's DIY 50EH5 SE Tube Amplifier. The enclosure is a black painted metal cookie tin.
Don-SE-807-Tube-Amplifier.jpg
Don-SE-807-Tube-Amplifier.jpgSingle-Ended 807 Tube Amplifier4014 viewsI have stated in the past that my mate Don makes an amp a month. This month Don has completed an 807 amp based on a schematic designed by Matt from the USA and the same as I built a short time back. I took a short listen and thought it OK but a much longer review is required. Don’s iron is wound by Dyne which is near us (Melbourne, Australia) and Don’s superb enclosure bases are made by him from, once more, Australian Spotted Gum. Top plate is once more ABS and OPTs are James. This not only a smart looking amp but with some high quality passives under the bonnet and again a very neat wiring layout. In this build JJ filters caps were used. Don has another amp in the pipeline so stayed tuned. About one month from now (lol).

Mark Houston – retro-thermionic
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00095.jpgMaking the chassis, rear view4005 viewsPutting together the plastic and the metal, rear view.
DIY-KT88-Single-Ended-Tube-Amp~2.jpg
DIY-KT88-Single-Ended-Tube-Amp~2.jpgDIY KT88 Single Ended Tube Amplifier3972 viewsSingle Ended Tube Amplifier after Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.
6P3S-286L629-Push-Pull-with-E80CC-drivers.jpg
6P3S-286L629-Push-Pull-with-E80CC-drivers.jpgE80СС + 6P3S (6L6) Push-Pull3946 viewsIn the second photo E80СС + 6P3S (6L6) push-pull Class-A. This selection of tubes also works with the is in the same HP floppy drive enclosure amplifier.

Rakhmanov Ilya (Рахманов Илья)
Moscow, Russia.
STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit.jpg
STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit.jpgSTA1 DIY Tube Preamp Kit (12AU7/ECC82) - inside3927 viewsInside view of a STA1 tube preamp kit from Lighthouse Electric. This a three stage design using 12AU7 tubes.
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DSCF0795-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier3926 viewsFor those that are less willing to create their own cases. Here is a completed DIY-GENE Mark Levinson Clone 60Watt / Ch Dual Mono Amplifier. It is hernia inducing weighing in at nearly 50Kg. The kit comes with most of the amplifier electronics built and tested and with all the casing components. All you need to do is to build the PSUs and put it all together. This example has 2 x 65-0-65V at 10A each. It runs very HOT as you would expect a high output Class A amplifier to run. Great care must be taken to mount the 12 x Output Transistors correctly, a small mistake cost me over £60.00 in burnt components. Note the Capacitor connections and the extremely BEEFY PSU.

Built by Andy Freestone
DSCF0794-C.JPG
DSCF0794-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier3916 viewsFor those that are less willing to create their own cases. Here is a completed DIY-GENE Mark Levinson Clone 60Watt / Ch Dual Mono Amplifier. It is hernia inducing weighing in at nearly 50Kg. The kit comes with most of the amplifier electronics built and tested and with all the casing components. All you need to do is to build the PSUs and put it all together. This example has 2 x 65-0-65V at 10A each. It runs very HOT as you would expect a high output Class A amplifier to run. Great care must be taken to mount the 12 x Output Transistors correctly, a small mistake cost me over £60.00 in burnt components. Note the Capacitor connections and the extremely BEEFY PSU.

Built by Andy Freestone
12AX7-Tube-Phono-Preamplifier.jpg
12AX7-Tube-Phono-Preamplifier.jpg12AX7 Vacuum Tube Phono Preamplifier3913 viewsOk, so after buying a Sansui SR-1050C Turntable, I needed a phono preamp, so I built one.

This one uses no premium parts, but sounds great. It does have a small amount of 60Hz hum, and I plan on installing some tube shields as I know its been induced by the power transformer as the PS is completely clean. The preamp uses a pair of 12AX7 vacuum tubes.

The power supply uses a MOSFET for regulation and the preamp uses a passive RIAA equalization network.


Bernardo
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TSpecial.JPG6T9 4.7W DIY Tube Amplifier in a Baking Pan3912 viewsA Tube amp kit based on Spare Time Gizmo's printed circuit boards which are plated through, solder masked and screen printed. I sourced common components from the local electronics shop but used a pair of NOS GEC 6T9, Alps potentiometer, solid brass knob and a Hammond power transformer. The chassis is a Teflon coated backing pan ($7). The OPTs are custom wound toroidals. The amp is a little bass shy. Doubling the 100uF power caps helped increase bass. See the 6T9 Tube Amplifier Project for more details.
CSS-FR125SR-Fullrange-Speaker-Drivers.jpg
CSS-FR125SR-Fullrange-Speaker-Drivers.jpgCSS FR125SR Fullrange Speaker Drivers3904 viewsA pair of CSS FR125SR drivers by Creative Sound Solutions. These are nice looking drivers that unfortunately have a few problems. See the CSS FR125SR fullrange driver page for more information and Thiele / Small parameter measurements.
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