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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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Simple-SE-6L6GC-Tube-Amp.jpg
Simple-SE-6L6GC-Tube-Amp.jpgSimple SE 6L6GC Tube Amp Kit3360 viewsFront view of the Simple SE Tube Amplifier using a PCB from tubelab.com. Rectifier tube is 5AR4/GZ34, input tube is 12AT7/ECC81 and power/output tubes are 6L6GC. The audio output transformers are from Edcor.
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Par-Metal_Case_ICEPower_1000ASP_modules.jpgPar-Metal Case with B&O ICEPower 1000ASP modules3339 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
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00126.jpgFinished, rear view (Ipod not included)3322 viewsCheck out the DIY heatsink.
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PP_EL84_driver_EL84.jpgSimple EL84 PP, my first tube audio DIY project3320 viewsThe well known simple EL84 PP schematic as my first attempt at Tube Audio projects.
Here in the first version I also used the EL84 triode strapped as a driver. For me It was like hearing music from heaven.
That wooden case is from a liquor store having which contained Vodka and Brandy inside.
KT88-Push-Pull-Tube-Amp-Bottom.jpg
KT88-Push-Pull-Tube-Amp-Bottom.jpgKT88 Push Pull Tube Amplifier (Bottom)3317 viewsUnderside view of KT88 Tube Amplifier. The amplifier is based on Bruce's OD 225 but uses KT88 output tubes for more power. See this thread for more information and photographs.
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Finished~0.JPGOPA2134 Opamp Preamp - Big Brass Knob3298 viewsMy third Burr-Brown OPA2134 based preamp sees a sleek red die-cast aluminum case of two coats of epoxy paint and a sexy 4 oz brass knob. This build is based around the 1uf Jupiter Bees Wax and Paper caps. See other photos for more info. The first thing I notice when playing this preamp through my valve monoblocks was a dramatic increase in bass. The other obvious audio advantage is an increase in stereo focus. Not only is bass deeper (and louder) but there appears to be more layers to it. Voice sounds earthier and more immediate. A 26V 3.5A computer PS powers the unit but each channel has its own and separate virtual PS. Five 220uF low ESR caps store power directly on the cct. brds. A suspended wooden floor in the case provides a base to suspend the cct. brds on. Silver wire and silver solder is used throughout with an Alps blue velvet attenuator. Very impressive sound. The very best one I have made to date.
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Nelson-Pass-B1-Buffer-Preamp-rear.jpgNelson Pass B1 Buffer Preamp - rear3295 viewsDIY Nelson Pass B1 Buffer from the rear shows two selectable inputs and a single output. Compared to the Nelson Pass BoZ the mid range and treble I feel are more transparent but bass weight is less. The sound is completely un-coloured. This inexpensive simple preamp has a frequency extension from 5Hz to 780kHz and is very PS tolerant.
Mark Houston

For more information about this build see the Russian Pass B1 FET Preamp/Buffer thread on the forum.
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DIY-6V6-Push-Pull-Tube-Amplifier.jpgDIY 6V6 Push-Pull Tube Amplifier3293 views6V6 push-pull tube amp with Hammond 1608A audio output transformers. 6SL7 input and GZ34 rectifier. See the DIY Push-Pull (PP) 6V6 Tube Amplifier Schematic for full details.
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LM3875-amplifier.jpgLM3875 Gainclone Chipamp on Protoboard3290 viewsEach LM3875 amplifier module (board) has its own DC rectifier that is made from high speed switching diodes. The supply capacitors are on the board. See the Point to Point LM3875 Non-Inverting Gainclone Chipamp Instructions for ideas on how to construct an amplifier like this on a protoboard or veroboard.
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5687-Tube-CD-Linestage.jpg5687 Tube Linestage3278 viewsHere I am using a diy 5687 tube preamp as a line stage for a Sony CD player.
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6V6_PP_1_S.jpg6V6 PP, 6SL7 LTP Driver - Phase Splitter3256 viewsAnother try to small power PP AMPS. 6SL7 in frint in LTP configuration, using IXYS 10M45s as current sink at 1.2mA.
Output tubes are set with a fixed bias, using a separate and negative voltage power supply.
A nice sounding amplifier which provides about 10.5 Watts at 1.5 % THD. This amp uses Hammond OPT's and a PSU choke.
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SV101939.JPGVintage Sony TAN-5550 and TAE-54503250 viewsPat from the Melbourne Audio Club picked up these very nice Sony VFET preamp and power amp combo for a song. The power amp uses a JFET front end but derives its power from an array of VFETs to produce 65W into 8ohms. The preamp has more filters, dual tone controls, inputs and outputs than you can shake a power cord at.

This combo drove my moddified Tandy Minimus 77s with a replacement Al/Mg 4" HiVi woofer/mid at good volume with a very controlled solid bass sound I would only have expected from much bigger speakers. Mids were warm and treble mellow. The Sony represents a great collectors piece.
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IMG_1419.JPGDissipator3243 viewsThe dissipater is homemade.
Note the shape and size of the inter-connecting metal between sheets... i don know if the shape was necessary but... it was a aesthetic choice.
BoZSE_-_Bride_of_Zen.jpg
BoZSE_-_Bride_of_Zen.jpgBoZoaC - Bride of Zen on a Cap3243 viewsThis build and my capless BoZSE both sound superior to my earlier BoZ builds. But which is better is hard to pick. Here is the finished BoZoaC. Two selectable Inputs on the rear and output on the left side. Small banana sockets on the right allow checking of the internal batteries without lifting the lid. The preamp could be powered through these. BoZoaC appears to have kept the great bass weight and extension of BoZSE with even better mids. Highs are about the same. Frequency range: 6hz -> 200khz. 13Vpp maximum out into 22K with 24V PS. Current draw = 12.5mA.
Mongrel Dog Audio
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Claravox-Dogma.jpgClaraVox Dogma Loudspeakers3239 viewsVery modern looking setup. If you think it looks expensive, they are $59,000 a pair for the speakers only! I wonder how well they image with the tweeter so far away from the mid?

Website: http://www.dgfdesign.it
chipamp-gainclone-amplifier.jpg
chipamp-gainclone-amplifier.jpgDIY Chipamp / Gainclone Amplifier3238 viewsThis is the diy enclosure for my 5 channel gainclone project. The five channels are powered by an external transformer that was borrowed from an old Fisher receiver. The amplifier is It is driven directly from an external SoundBlaster Live audio card. The cost of the whole setup, was under $100.

See the gainclone page for more amplifier ideas.
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IMG_1420.JPGDIY Heat Sink3229 viewsAfter polishing... beautiful, no?
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00139.jpgFinished, front view3225 viewsNow you know why it is named Blackbox, right?
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Hiraga-MC-Phono-Preamplifier.jpgHiraga MC Phono Preamplifier3212 viewsFinding I liked Moving Coil cartridges I tried my hand at yet another MC preamp. This one is a Jean Hiraga design and uses matched low noise bipolar transistors pairs and a +/- 6V source. The transistors Hiraga specifies are no longer available. But better replacements are the Analog Devices SSM2220 chips at $11 each (you need two). Hiraga specifies very large storage caps so I juiced this compact build with 1F (1,000,000uF). Plus I added 220uF low ESR caps and 0.22uF snubbers for better mid-range performance. Since this image I mounted an external switch to select between 220, 100 and 45 ohms of loading. A 25 turn trim pot allows adjustment of "0" volts on the input and Russian PIO caps decouple the output.

Mark – Mongrel Dog Audio
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EF86-EL84-Parafeed-Tube-Amplifier.jpgEF86 / EL84 Parafeed Tube Amplifier3205 viewsEF86 driver and EL84 output Parafeed Tube Amplifier. Uses a 230V primary, 9V secondary Talema 30VA mains toroidal transformer as the audio output transformer (OPT). For more details and a schematic, see the EF86 / EL84 Parafeed amp thread.
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