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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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OwenSpecialFront.JPG
OwenSpecialFront.JPGThe Owen Gainclone Special4468 viewsI was commissioned to build my ex-boss a chip amp based on my Synergy LM3875 Gainclone Chip Amplifier. This has two LM3875 modules inside with Alps pot, 4oz solid brass volume knob, two 8000uF caps (red) and 1000uF low ESR line caps. Remote PS (left) has fast switch diodes (snubbed),160VA toroidal transformer. Both amp and PS are housed in die-cast cases and stand on solid brass cones. All point-to-point wiring.
K-12G-Tube-Ampleifier-Kit-UK.jpg
K-12G-Tube-Ampleifier-Kit-UK.jpgK-12G Tube Amp Kit build from UK4463 viewsHi this is my new build of an S-5 Electronics K-12G tube amplifier. I'm really proud of it and hope it can inspire others.

Transformer covers, knobs, feet, phono plugs and other parts sourced from http://www.mafaudio.com/.
The main transformer case was scratched and they will send another free with my next order. I've found them very easy to deal with. The case is made of pine bought at the local merchants with a plywood top. I used only simple tools.

There are more photos available in my photo library.

Luke Collings
Wiltshire, UK
12AU7-IRF510-LM317-Headphone-Amp.jpg
12AU7-IRF510-LM317-Headphone-Amp.jpg12AU7 Tube / IRF510 MOSFET Headphone Amp4430 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
LidOff.JPG
LidOff.JPG"not another chip amp"4422 viewsAfter the Synergy Gainclone amp I promised myself I would not make another chip amp. The point-to-point gainclone amp modules were made twelve months ago but never got used. They comprise of the LM3875 and 10,000uF caps. The PS is rated 160VA with a scavenged microwave mains filter and a snubbed rec. bridge. The amp is compact and very loud with a full and very extended bass with small bookshelf speakers. You feel this amp could power a whole night club. Well it fills this house with clear clean music! And that is how it sounds -> clear and clean!
OTL-Tube-Headphone-Amplifier.jpg
OTL-Tube-Headphone-Amplifier.jpgOTL Tube Headphone Amplifier4417 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 Watts4402 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.
DIY-Vacuum-Tube-Prototype-Bread-Board.jpg
DIY-Vacuum-Tube-Prototype-Bread-Board.jpgDIY Vacuum Tube (Valve) Prototyping Bread Board4369 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.
6C33C-6S33S-Single-Ended-Tube-Amplifier.jpg
6C33C-6S33S-Single-Ended-Tube-Amplifier.jpg6C33C (6S33S) Single-Ended Tube Amplifier4368 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-6AS7-Tube-Headphone-Amplifier.jpg
DIY-6AS7-Tube-Headphone-Amplifier.jpgDIY 6AS7 Tube Headphone Amplifier4339 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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0006sa0w.jpegOTL 6082 amplifier4252 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)
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00003.jpgCustom PCB4245 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 capacitors4218 viewsWired with the resistors, smaller caps and a cooper cable extension to make easier the soldering and assembly.
B2BO_ICEPower_1000ASP_modules_.jpg
B2BO_ICEPower_1000ASP_modules_.jpgICEPower 1000ASP modules in Par-Metal Enclosure4192 viewsThis is a high power audio amplifier project that I recently completed. The amplifier used two B&O ICEPower 1000ASP modules. Each amplifier module is rated at 1000 Watts. The two amplifier modules are housed in a Par-Metal aluminum case. The amplifier sounds amazing with my Epos ELS303 speakers.

See the other photographs.

Ed
Detroit, MI
USA
50EH5-DIY-Tube-Amp-Rear.jpg
50EH5-DIY-Tube-Amp-Rear.jpgDIY 50EH5 SE Tube Amp - Rear View4186 viewsThis tube amp is based on Giovanni's DIY 50EH5 SE Tube Amplifier. The enclosure is a black painted metal cookie tin.
DIY-KT88-Single-Ended-Tube-Amp~2.jpg
DIY-KT88-Single-Ended-Tube-Amp~2.jpgDIY KT88 Single Ended Tube Amplifier4160 viewsSingle Ended Tube Amplifier after Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.
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DSCF0795-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier4159 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
Oatley_Electronics_K303_JFET_RIAA_Preamp_Kit.jpg
Oatley_Electronics_K303_JFET_RIAA_Preamp_Kit.jpgOatley K303 JFET RIAA Preamplifier Kit4159 viewsThis is the second of the Oatley Electronics K303 two stage JFET phono preamps. I have built. The first build was in a "tinny" instrument case. The preamp sounded so good that I decided to construct another but this time in a heavy cast aluminum enclosure.

The K303 RIAA preamp kit comes complete with all required parts and a selectable 120/240V power supply. The RIAA section is all passive. The PS incorporates both a voltage doubler and a capacitor multiplier. The two different JFETs have been carefully chosen for their low noise and gain characteristics.

I have chosen a flame red epoxy enamel paint and separated the preamplifier section from the PS. The preamp is dead quiet and so far is the best sounding phono preamp I have built. At AU$30 for the kit, it’s a steal.

retro-thermionic
DSCF0794-C.JPG
DSCF0794-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier4152 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
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00095.jpgMaking the chassis, rear view4141 viewsPutting together the plastic and the metal, rear view.
6P3S-286L629-Push-Pull-with-E80CC-drivers.jpg
6P3S-286L629-Push-Pull-with-E80CC-drivers.jpgE80СС + 6P3S (6L6) Push-Pull4139 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.
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