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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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DIY-6V6-Push-Pull-Tube-Amplifier.jpg
DIY-6V6-Push-Pull-Tube-Amplifier.jpgDIY 6V6 Push-Pull Tube Amplifier3532 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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00118.jpgLM3886's and heatsink3527 viewsThe thin cables are for the grounds that (i suppose) don't carry high current. The chips have silicone grease for better thermal conduction.
Nelson-Pass-B1-Buffer-Preamp-rear.jpg
Nelson-Pass-B1-Buffer-Preamp-rear.jpgNelson Pass B1 Buffer Preamp - rear3523 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.
Simple-SE-6L6GC-Tube-Amp.jpg
Simple-SE-6L6GC-Tube-Amp.jpgSimple SE 6L6GC Tube Amp Kit3520 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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Finished~0.JPGOPA2134 Opamp Preamp - Big Brass Knob3502 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 project3487 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.
BoZSE_-_Bride_of_Zen.jpg
BoZSE_-_Bride_of_Zen.jpgBoZoaC - Bride of Zen on a Cap3485 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
LM3875-amplifier.jpg
LM3875-amplifier.jpgLM3875 Gainclone Chipamp on Protoboard3480 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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KT88-Push-Pull-Tube-Amp-Bottom.jpgKT88 Push Pull Tube Amplifier (Bottom)3478 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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BillsSetUp.JPGBills beautiful gear3475 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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00126.jpgFinished, rear view (Ipod not included)3474 viewsCheck out the DIY heatsink.
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MC-Step-up-Tranformer.jpgDIY MC Step-up Transformer3466 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)
DIY-6AS7-Tube-Headphone-Amplifier.jpg
DIY-6AS7-Tube-Headphone-Amplifier.jpgDIY 6AS7 Tube Headphone Amplifier3459 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.
Hiraga-MC-Phono-Preamplifier.jpg
Hiraga-MC-Phono-Preamplifier.jpgHiraga MC Phono Preamplifier3451 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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6V6_PP_1_S.jpg6V6 PP, 6SL7 LTP Driver - Phase Splitter3425 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.
5687-Tube-CD-Linestage.jpg
5687-Tube-CD-Linestage.jpg5687 Tube Linestage3422 viewsHere I am using a diy 5687 tube preamp as a line stage for a Sony CD player.
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chipamp-gainclone-amplifier.jpgDIY Chipamp / Gainclone Amplifier3421 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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Claravox-Dogma.jpgClaraVox Dogma Loudspeakers3408 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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SV101939.JPGVintage Sony TAN-5550 and TAE-54503405 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.JPGDissipator3401 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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