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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 Amplifiers6664 viewsChip amp monoblock amplifiers based on a retro look and the LM3875 chip.
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Mill_1.JPGFront View of the DIY OTL Tube monoblocks6653 viewsWeighing in at 18.5kg's each , these chassis are milled out of Aluminum plate and form part of the main heat sink for the tube sockets that are a precision fit . 6mm thick plate was used through out . The feet are solid with machined slots using cap screws to capture from the inside ( so no holes can be seen )
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PreAmp.JPGOPA2134 based preamp with balance control.6627 viewsWith the case work complete it will not be long before this OP based preamp is singing along. The case is small about 115 X 85 and cast aluminum. Gain is 3 dB and a balance control has been included. Full details for this project are available at: DIY OPA2134 Preamplifier Project.
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DIY-2SK1058-Mosfet-Amp-Night.JPGDIY 2SK1058 Class A Mosfet Amp in the dark6626 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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DIY-Three-Way-Tower-HiVi-Loudspeakers.JPGDIY Three Way Tower HiVi Loudspeakers6613 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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dscf1832.jpgFostex FE127E FS Fonkens6603 viewsDriver is the Fostex FE127E. Veneer is Beeswing Saples. A royal PITA to work with.
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dscf1833.jpgFostex FE127E FS Fonkens6594 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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mURI_temp_f1d472f0.jpgDIY Speaker Cable6582 viewsThe cable in the beginning of the project.
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AMPVIEW.jpgFinished K-12M Tube Amp Kit6571 viewsThe finished S-5 Electronics K-12 Tube Amplifier Kit.
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DIY-HiVi-SP10-Subwoofers.jpgDIY HiVi SP10 Subwoofers6560 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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K-8LS-Tube-Amplifier-Kit.jpgS-5 Electronics K-8LS Tube Amplifier Kit6556 viewsS-5 Electronics K-8LS Tube Amplifier Kit on the work bench for testing.
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K_16LS_Tube_Amp_Kit_with_PL_Preamp_Kit.jpgK-16LS Tube Amp Kit with PL Tube Preamp6544 viewsAfter months of looking I finally decided on the S-5 Electronics K-16LS stereo tube amplifier kit together with its sister PL tube preamplifier kit. The Stereo Integrated Tube Amplifier produces up to 16W and utilizes 5670 triode and 6005 pentode tubes. The PL tube preamp kit uses a 5670 triode tube.

I ditched the supplied wood board for a larger board to accommodate the preamp. Using my IPod and a set of Celestion floorstanders (90dB) I sat back to listen. WOW - seriously loud. Bass is fantastic, treble is sharp. Mid range seems to be missing a bit but after trying different tracks I am putting this down to poor quality source MP3 via the IPod. There is a reasonable amount of hum when you take the volume up but nothing annoying.

Next step is to attempt the mods for the K-12 kits.

David - UK
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sm-Mains_final_Crossover.jpg3-Way Crossover6532 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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2SK1058-SE-Mosfet-Amp.jpg2SK1058 Single-Ended (SE) Amplifier6523 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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bass_table.jpgSubwoofer Coffee Table6515 viewsA subwoofer which has been transformed into a coffee table.
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ClubPreampComp.jpgMelbourne Audio Club preamp comparison night equipment6451 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 Speaker6432 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 Amp6416 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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Copper_Steampunk_K-12GTube_Amplifier_Kit_2.jpgCopper Steampunk K-12G Tube Amp Kit - Rear6396 viewsThis is a K-12G tube amplifier kit that I built into a steampunk-ish enclosure. Had a blast with this one, and I'm amazed at the amount of wonderful sound that this little tube amp kit puts out!

I'll be posting construction photos on my blog site if you're interested in taking a look: www.coppersteam.com

Mike Cochran
Key West, USA
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Diaphony4.jpg"Diaphony's" An open baffle design6387 viewsConstruction
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