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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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LM3875-Monoblock-Amps.JPGLM3875 Chip Amp Monoblock Amplifiers6502 viewsChip amp monoblock amplifiers based on a retro look and the LM3875 chip.
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DIY-2SK1058-Mosfet-Amp-Night.JPGDIY 2SK1058 Class A Mosfet Amp in the dark6497 viewsSergiy Makharchuk from Russia has put together a version of Mark's DIY Class A 2SK1058 Mosfet Amplifier. Here you can see it lit up in the dark.
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K-16LS-Tube-Amplifier-Kit-Hammond-OPT.jpgK-16LS Tube Amp Kit with Hammond OPT6467 viewsAndy's son put also together a K-16LS Tube amplifier kit with the additional tone control preamp section. He used Hammond Output Transformers in place of the ones which came with the kit. See see his Andy's webpage for more photos and information.

Also, additional information about the S-5 kits is available at the Tube Amplifier Kit page.
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dscf1832.jpgFostex FE127E FS Fonkens6443 viewsDriver is the Fostex FE127E. Veneer is Beeswing Saples. A royal PITA to work with.
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dscf1833.jpgFostex FE127E FS Fonkens6429 viewsHere is the setup in the basement. The new Audio Nirvana Super 12s are what are sitting on the Fostex FE127E Fonkens. I am breaking them in and will be building bass reflex cabinets soon.
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TDA2003-DIY-HiFi-Amplifier.jpgTDA2030 DIY HiFi Amplifier6423 viewsAnother excellent looking build by vortchun. This DIY amplifier is built around the TDA2030 which will put out a maximum of 14W. The wooden enclosure matches the previously completed Voight Pipe Speakers Visaton BG 17 driver project.

For full details of this TDA2030 chip amplifier build, see the TDA2030 DIY Amplifier thread on the discussion forum.
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K-8LS-Tube-Amplifier-Kit.jpgS-5 Electronics K-8LS Tube Amplifier Kit6406 viewsS-5 Electronics K-8LS Tube Amplifier Kit on the work bench for testing.
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DIY-Three-Way-Tower-HiVi-Loudspeakers.JPGDIY Three Way Tower HiVi Loudspeakers6403 viewsThese are David's version of the DIY 3-Way HiVi Tower Loudspeakers by Adam. Each of the three-way tower loudspeakers uses one HiVi F8 woofer, two HiVi F5 mid-woofers and a HiVi RT1C-A Planar Isodynamic Tweeter. The tower loudspeakers follow the plans for Adam's build with the exception that a HiVi Research RT1C-A is used in place of the HiVi SD1.1A.
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AMPVIEW.jpgFinished K-12M Tube Amp Kit6399 viewsThe finished S-5 Electronics K-12 Tube Amplifier Kit.
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sm-Mains_final_Crossover.jpg3-Way Crossover6390 viewsCrossover for my main speakers with twin Lambda 12 TDs mid woofers, 4 passive radiators, 2 scan speak mids, and HIVI research RT2II tweeter
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DIY-HiVi-SP10-Subwoofers.jpgDIY HiVi SP10 Subwoofers6384 viewsDaniel's build following Adam's DIY HiVi SP10 Subwoofer Project. Daniel reports that the subwoofers produce low frequencies which are accurate and very well defined. There are many more pictures and information about Daniel's build at his webpage.
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mURI_temp_f1d472f0.jpgDIY Speaker Cable6381 viewsThe cable in the beginning of the project.
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bass_table.jpgSubwoofer Coffee Table6349 viewsA subwoofer which has been transformed into a coffee table.
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2SK1058-SE-Mosfet-Amp.jpg2SK1058 Single-Ended (SE) Amplifier6341 viewsThis Class-A power amplifier with zero negative feedback and 5W output audio power was built based on the schematic of the DIY Class-A 2SK1058 MOSFET Amplifier project by Mark Houston.

The amplifier uses a custom handmade choke coil.
The power supply uses 4 x 15000 µF Towa capacitors designed for Adcom.
Two large heatsinks and one 88mm fan provide enough cooling to keep the temperature below 60°C.
The amplifier is used with custom made sensitive acoustics.
The sound is very precise and detailed. It has deep sound staging and amazing microdynamics.

For more pictures please visit http://alexkap.com/.
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ClubPreampComp.jpgMelbourne Audio Club preamp comparison night equipment6310 viewsFor the preamp comparison my 12AX7 Tube Preamp and OP Amp Preamp were used. My Gainclone monoblocks were used for the power amps. The speakers in the other image were built by a club member also. An A/B switch was used to switch from one preamp to the other under a blind test situation. This allowed a quick comparison between the two very different preamps. Though the chip preamp was voted the better (60/40) many still expressed their preference for the valve preamp.
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Fostex-FE127E-DIY-Bass-Reflex-Speaker-1.jpgFostex FE127E DIY Bass Reflex Speaker6269 viewsClose up view of the finished bookshelf speakers. The speakers are based on the plans of Rabbitz Fostex FE127E DIY Bass Reflex Bookshelf Speakers.

The woodworking and painting of the cabinets were completed by a friend.
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6SN7-6L6-Tube-Amp-1.jpg6SN7 / 6L6 DIY Tube Amp6264 viewsThe valve lineup for each channel is a 6SN7 as first amplifier and phase splitter, followed by another 6SN7 driving a pair of 6L6s. Bias is set by active semiconductor current sinks. The 400V HT is generated by a double anode diode (5R4) driving a choke input filter. The audio output transformers are Hammond Manufacturing 1620s. With a conservative rating of 20W per channel, measured frequency response is 10Hz to 40KHz with minimal square wave overshoot. I'm very pleased with how this unit sounds and looks.

Schematic Drawing: Williamson 6SN7 - 6L6 (KT66) Tube Amplifier
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S-5-Electronics-K-12-Tube-Amp-Kit-2.jpgS-5 Electronics K-12 Tube Amp Kit6223 viewsFront view of K-12 Tube Amplifier Kit. The case is made of MDF and painted black with a high temperature resistant paint. Above the front On/Off switch is a blue LED. I also exchanged the volume knob with a black one from an old Yamaha subwoofer.
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S-5-Electronics-K-12-Tube-Amp-Kit-Board.jpgS-5 Electronics K-12 Tube Amp Kit - Circuit Board6215 viewsBottom view of my K-12 Tube Amp Kit. The fan is used to cool the power transformer which runs a little hot.
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mURI_temp_83a855a8.jpgDIY Folded Horn Tower Speaker6201 viewsHere is a front close-up of the tower speakers !
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