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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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Fostex-FE206En-Double-Bass-Reflex-Speakers.jpg
Fostex-FE206En-Double-Bass-Reflex-Speakers.jpgFostex FE206En Double Bass-Reflex Speakers3919 viewsThe finish is satin black stipple and the grills are held in place with four rare earth button magnets. Easy to pop on and off. The stipple effect was produced with a roller going over the fresh paint a number of times as it dried. The drivers huge magnets have bitumanised aluminum foil dampening attached and the internal wiring is two stands of lightly twisted wire wrap wire to each binding post. The top chamber is lined (but not stuffed) with Dacron but the bottom chamber is empty. There is no crossover in these fullrange speakers. Efficiency is 96dB at 8ohms impedance so they work well with flea power tube amps. Sitting higher than the tweeter (wizzer cone) the sound is quite natural with just a touch of forwardness in the mid-range. The speakers not only look stunning they sound excellent for a $500 spend.

For full details see the Fostex FE206En Double Bass-Reflex Speaker project page.

Mark Houston – retro-thermionic
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00003.jpgCustom PCB3918 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 capacitors3908 viewsWired with the resistors, smaller caps and a cooper cable extension to make easier the soldering and assembly.
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12AU7-IRF510-LM317-Headphone-Amp.jpg12AU7 Tube / IRF510 MOSFET Headphone Amp3907 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
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S5-K16LS-Tube-Amp-Kit-Mahogany.jpgK-16LS Tube Amp Kit (16W)3874 viewsThe S-5 Electronics K-16LS tube amplifier kit built into a Mahogany case. The tube amp kit was built with all the mods outlined in the forums here at diyAudioProjects.com. The circuit board was built with components (except the tube sockets) on the bottom side so just the tubes would be exposed. The front driver tubes is lit red with LEDs.

Charlie Mooradian
USA
6C33C-6S33S-Single-Ended-Tube-Amplifier.jpg
6C33C-6S33S-Single-Ended-Tube-Amplifier.jpg6C33C (6S33S) Single-Ended Tube Amplifier3870 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.
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Point_to_Point_Bride_of_Zen_Preamplifier.jpgBoZoaC - Bride of Zen on a Cap3859 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
50EH5-DIY-Tube-Amp-Rear.jpg
50EH5-DIY-Tube-Amp-Rear.jpgDIY 50EH5 SE Tube Amp - Rear View3849 viewsThis tube amp is based on Giovanni's DIY 50EH5 SE Tube Amplifier. The enclosure is a black painted metal cookie tin.
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00095.jpgMaking the chassis, rear view3835 viewsPutting together the plastic and the metal, rear view.
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DIY-Vacuum-Tube-Prototype-Bread-Board.jpgDIY Vacuum Tube (Valve) Prototyping Bread Board3828 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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0006sa0w.jpegOTL 6082 amplifier3826 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)
STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit.jpg
STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit.jpgSTA1 DIY Tube Preamp Kit (12AU7/ECC82) - inside3749 viewsInside view of a STA1 tube preamp kit from Lighthouse Electric. This a three stage design using 12AU7 tubes.
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IMAGE_145.jpgOne valve (tube) 60W guitar amplifier3714 viewsThis guitar amp comprises of one $1000 radio transmitter valve which runs on 700Volts. The driver cct. is on the left and is a multi-stage transistor unit. The OPT on the right was wound by the owner using a primary/secondary interlace config. and then vacuum impregnated. A fan is required at the base of the valve to stop the ceramic socket over-heating. Very loud!
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TSpecial.JPG6T9 4.7W DIY Tube Amplifier in a Baking Pan3713 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.
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DIY-KT88-Single-Ended-Tube-Amp~2.jpgDIY KT88 Single Ended Tube Amplifier3711 viewsSingle Ended Tube Amplifier after Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.
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00119.jpgFinished, inside view3700 viewsEI transformer, rectifier, star ground (just above the left cap of the rectifier), LM3886...
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IMG_3492.jpgTesting of active crossover3696 viewsThe active crossover is using Rod Elliot's P09 design and is 24db/octave Linkwitz-Riley crossed at 3500Hz. Op amps are cheap TL072 and the sound is still great. Transients are not lost whatsoever.
50EH5-DIY-Tube-Amplifier.jpg
50EH5-DIY-Tube-Amplifier.jpgDIY 50EH5 Single Ended Tube Amplifier3691 viewsThis is my build of Giovanni's DIY 50EH5 Single Ended Tube Amplifier. The enclosure is a metal cookie box that has been painted black. The transformers were custom wound by a local guy.
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DSCF0794-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier3684 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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DSCF0795-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier3677 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
614 files on 31 page(s) 17


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