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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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IMG_1422.JPGDIY Heatsink3724 viewsNote the shape and size of the inter-connecting metal between sheets... i don know if the shape was necessary but... it was an aesthetic choice.
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Audio-Innovations-700-Integrated-Tube-Amp.jpgAudio Innovations 700 Integrated Tube Amp3719 viewsAudio Innovations 700 Integrated amp. It is only 25W and really not impressive at all. Uses EL34 valves.
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Hiraga-MC-Phono-Preamplifier.jpgHiraga MC Phono Preamplifier3714 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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TSpecialUnderChassis.JPGUnderside view of the 6T9 baking pan tube amp3710 viewsThe OPTs and printed cct. brd. fit snugly in the thin baking pan chassis making a compact little amp. Drilling such a thin chassis has its challenges and getting all the drilled points to line up with cct. brd. mounting holes can be frustrating. This amp is a poor performer under the CRO but produces an astounding stereo image. It plays small classic quartets, jazz groups and most voice and piano based music well. You need at least 90dB efficient speakers that can go deep for good listening. See the 6T9 Tube Amplifier Project page for more info.
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12AU7-Tube-Cathode-Follower-Preamp.JPG12AU7 Cathode Follower Tube Preamplifier3704 viewsThis is a DIY 12AU7 vacuum tube preamp. Rectifier is a 6X5GT, and voltage regulator is an 0D3 tube.

Here are more details about this DIY 12AU7 Tube preamplifier.
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Seas-exotic-fullrange-loudspeaker.jpgNew Seas Fullrange Speaker3695 viewsThe new 8" Seas fullrange unit. Not much info available other than it will be release Jan 2008. The magnet does not look all that large, so I suspect it will be a high Q driver.
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KT88-Push-Pull-Tube-Amp-Front.jpgKT88 Push Pull Tube Amplifier (Top)3689 viewsTop view of the KT88 push-pull tube amplifier. The amplifier is based on Bruce's KT88 Push-Pull Tube Amp but uses new production KT88 Genalex Gold Lion tubes from Tube Depot. More information and photographs for this build are available in this KT88 Push-Pull Tube Amp message thread.
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Simple-SE-6L6GC-Tube-Amp.jpgSimple SE 6L6GC Tube Amp Kit3685 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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00118.jpgLM3886's and heatsink3663 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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Finished~0.JPGOPA2134 Opamp Preamp - Big Brass Knob3660 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 project3658 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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LM3875-amplifier.jpgLM3875 Gainclone Chipamp on Protoboard3634 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)3633 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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00126.jpgFinished, rear view (Ipod not included)3608 viewsCheck out the DIY heatsink.
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BillsSetUp.JPGBills beautiful gear3603 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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SV101939.JPGVintage Sony TAN-5550 and TAE-54503591 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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12inch-60L-DIY-Subwoofer.jpg12-inch 60L Subwoofer3590 viewsThese 60ltr sub-woofers were built to complement my 2-way speakers "VoXDeuX". The drivers are 12" polycones with a free air resonance of 25 Hz. In the box they go down to 31 Hz where they are very active. The drivers are very efficient and are being powered by a compact 50W Class-D amplifier. A stereo feed is taken from the preamp and passed through an electronic filter. The filter has a -3 dB point of 52 Hz and but employs only a -12 dB slope. The internals of the box comprise of six vertical braces. Bitumanised heavy Aluminum foil covers most surfaces. Pockets and chambers are formed at the rear by the bracing which carries additional dampening. These are then covered by a single layer of damping.

Mark Houston – retro-thermionic
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6V6_PP_1_S.jpg6V6 PP, 6SL7 LTP Driver - Phase Splitter3588 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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K281FrontS.jpgOatley Electronics sub-mini tube/chip amp hybrid K2813579 viewsAn image of the front panel of the Oatley Electronics of Australia tube and chip hybrid power amp. You can see the UV leds which indicate when the amp modules are powered. The amp comprises two K281 kits and is dual mono construction.

After extensive listening I am convinced this is a very good combination of tubes and chip in one integrated power amp. Sound stage in deep with each performer or instrument have their own space on that stage. Holographic.
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chipamp-gainclone-amplifier.jpgDIY Chipamp / Gainclone Amplifier3576 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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