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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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EL84_PP_6E6P_driver_1.jpg
EL84_PP_6E6P_driver_1.jpgThe Simple EL84 PP version 2 (on steroids) 3775 viewsThis is the second version of my first DIY audio project. I changed the Driver tube to 6E6P strapped as triode with CCS load (IXYS 10m45s - 15mA).
Current sinks LM317 at EL84 cathodes it not grounded but connected to a -24V negative power supply. That gives more gain, less distortion and gives also much more headroom for the output stage.
The coupling caps are 0.22μF PIO JENSEN. I' ll try the russian teflons in the next few days.
This tube amplifier simply rocks.
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Audio-Innovations-700-Integrated-Tube-Amp.jpgAudio Innovations 700 Integrated Tube Amp3767 viewsAudio Innovations 700 Integrated amp. It is only 25W and really not impressive at all. Uses EL34 valves.
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IMG_1422.JPGDIY Heatsink3758 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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TSpecialUnderChassis.JPGUnderside view of the 6T9 baking pan tube amp3751 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 Preamplifier3742 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.
KT88-Push-Pull-Tube-Amp-Front.jpg
KT88-Push-Pull-Tube-Amp-Front.jpgKT88 Push Pull Tube Amplifier (Top)3724 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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Seas-exotic-fullrange-loudspeaker.jpgNew Seas Fullrange Speaker3723 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.
Simple-SE-6L6GC-Tube-Amp.jpg
Simple-SE-6L6GC-Tube-Amp.jpgSimple SE 6L6GC Tube Amp Kit3723 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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12inch-60L-DIY-Subwoofer.jpg12-inch 60L Subwoofer3700 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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00118.jpgLM3886's and heatsink3695 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 Knob3695 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.
PP_EL84_driver_EL84.jpg
PP_EL84_driver_EL84.jpgSimple EL84 PP, my first tube audio DIY project3694 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.
LM3875-amplifier.jpg
LM3875-amplifier.jpgLM3875 Gainclone Chipamp on Protoboard3672 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.
KT88-Push-Pull-Tube-Amp-Bottom.jpg
KT88-Push-Pull-Tube-Amp-Bottom.jpgKT88 Push Pull Tube Amplifier (Bottom)3670 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.
DIY-SE-Class-A-Mosfet-Amp.jpg
DIY-SE-Class-A-Mosfet-Amp.jpgClass-A 2SK1058 Renesas Mosfet Single-Ended Amp in Heatsink Enclosure3667 viewsThis is a build of Mark Houston's DIY Class-A 2SK1058 MOSFET Amplifier which was built without circuit board in order to have the shortest connections as possible and to meet the tradition of valve amps. The heatsinks of the fanless enclosure are heating up to little more than 40° C

Stefan - Germany
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SV101939.JPGVintage Sony TAN-5550 and TAE-54503647 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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00126.jpgFinished, rear view (Ipod not included)3635 viewsCheck out the DIY heatsink.
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BillsSetUp.JPGBills beautiful gear3632 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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E88CC-SV83-SET-Amplifiers.jpgDual SV83 SET Amplifiers3631 viewsA mirrored pair of SET amplifiers, presently being used in bridged mode. All P2P construction using silver solder. I included a "Hazen grid" capacitor and input tube bias change switch. The single mA meter displays individual output tube bias current with a Left/Right switch. Edcor XPRW178 power transformer and GXSE10-6-8K output transformers. Upgraded caps to Jantzen Audio 1200V Z-Superior. Upgraded resistors to PRP PR9372 Audio for metal film and TAKMAN REX for carbon film. ALPS Blue 100K attenuator. The power supply uses a RCA 5U4GB rectifier and Hammond 156R choke. Matched pairs of Svetlana SV83 for power and JJ E88CC for the input tube.

Billy Whiten - Georgia, USA
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K281FrontS.jpgOatley Electronics sub-mini tube/chip amp hybrid K2813630 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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