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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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00118.jpg
00118.jpgLM3886's and heatsink3460 viewsThe thin cables are for the grounds that (i suppose) don't carry high current. The chips have silicone grease for better thermal conduction.
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Simple-SE-6L6GC-Tube-Amp.jpgSimple SE 6L6GC Tube Amp Kit3454 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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BillsSetUp.JPGBills beautiful gear3421 viewsBill, an audio club member, held an afternoon of beautiful and varied music compliments of his valve based equipment. Valve Cymer monoblocks (bottom), passive preamp, Hydra power conditioner and separate DAC and transport. The speakers are local made but have been heavily modified with external Xovers. Truly magnificent sound.
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DIY-6V6-Push-Pull-Tube-Amplifier.jpgDIY 6V6 Push-Pull Tube Amplifier3419 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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Finished~0.JPGOPA2134 Opamp Preamp - Big Brass Knob3417 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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PP_EL84_driver_EL84.jpgSimple EL84 PP, my first tube audio DIY project3415 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.
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00126.jpgFinished, rear view (Ipod not included)3411 viewsCheck out the DIY heatsink.
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KT88-Push-Pull-Tube-Amp-Bottom.jpgKT88 Push Pull Tube Amplifier (Bottom)3411 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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Nelson-Pass-B1-Buffer-Preamp-rear.jpgNelson Pass B1 Buffer Preamp - rear3411 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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LM3875-amplifier.jpgLM3875 Gainclone Chipamp on Protoboard3401 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 Linestage3360 viewsHere I am using a diy 5687 tube preamp as a line stage for a Sony CD player.
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BoZSE_-_Bride_of_Zen.jpgBoZoaC - Bride of Zen on a Cap3355 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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6V6_PP_1_S.jpg6V6 PP, 6SL7 LTP Driver - Phase Splitter3350 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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chipamp-gainclone-amplifier.jpgDIY Chipamp / Gainclone Amplifier3344 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_1419.JPGDissipator3336 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.
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SV101939.JPGVintage Sony TAN-5550 and TAE-54503336 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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Hiraga-MC-Phono-Preamplifier.jpgHiraga MC Phono Preamplifier3336 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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Claravox-Dogma.jpgClaraVox Dogma Loudspeakers3330 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
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IMG_1420.JPGDIY Heat Sink3317 viewsAfter polishing... beautiful, no?
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MC-Step-up-Tranformer.jpgDIY MC Step-up Transformer3310 viewsI the everlasting quest to better audio, I entered the realm of the moving coil phono cartridge with a Denon DL-103. To rise the output voltage of the Denon DL-103, I've build this Step-up transformer with two mic transformer from Edcor , I've use cast iron pipe bend with end plugs to make an electromagnetic shield. RCA connectors are recessed in the back of the pipes which are mounted on a black walnut plinth.

Félix-Antoine (Canada)
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