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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-Chipamp-Enclosure.jpg
LM3875-Chipamp-Enclosure.jpgLM3875 Chipamp Enclosure5582 viewsThis is my LM3875 DIY Chipamp / Gainclone . Please see the other pictures for more details.
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S5-Electronics-K12-Tube-Amp-Kit.JPGS-5 Electronics K-12 Tube Amplifier Kit5573 viewsThis is a S-5 Electronics K-12 Tube Amplifier Kit. I run a Cambridge Audio Azure 540C CD player into it and it feeds a pair of 70L 12" 3-ways - the classic '70's speakers - a kit from Macs Hifi ( no longer there) in Adelaide. They are very efficient as you would expect - and have been upgraded several times with new drivers and crossovers.
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mURI_temp_630f4f06.jpgDIY Speaker Cable5547 viewsThis is DIY Speaker Cable that I made for a friend.
This is the regular twisted pair design with the double shielding. I've used the regular heat shrink tube for the primary shield and nylon braided sleeve for the secondary shield.

The ends are terminated via plastic banana pins.

Also, here is a pair of DIY Braided Speaker Cables that I made.
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IMG_1869.JPGriverrat373's K-502 Tube Amplifier Kit - Front5514 viewsK-502 Tube Amp Kit without transformer cover and tubes.



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DSC_0168.jpgS-5 Electronics K-12M at Northern Californial DIY Event5505 viewsHere the S-5 Electronics K-12 Tube Amp is on display at a Northern Californial DIY Event.
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S-5-Electronics-K-12-Tube-Amp-Kit.jpgS-5 Electronics K-12 Tube Amplifier Kit5498 viewsRear view of my build of a S-5 Electronics Tube Amp Kit. The enclosure is made from MDF and painted with a high temperature resistant black paint. The back holes are just an air intake for the fan.
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SV100841.JPGInside the Step-up tranni box for MM cartridge5476 viewsThe inside of the box is lined with sticky bituminised-aluminum foil and speaker dampening vinyl. Pure silver wire, gold connectors and silver solder are used throughout. Velcro pads hold the transformers in place. The step-up transformers are wired for 6 dB gain. For more information, see my project write-up on the DIY Lundahl Moving Magnet Phono Step-Up Transformers.
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Tang-Band-D4-1-DIY-Back-Horn-Speaker-Kit.jpgTang Band D4-1 DIY Back Horn Speaker Kit5469 viewsThe fun and simple Tang Band D4-1 DIY Back Horn Speaker Kit. This little speaker kit comes complete with all the parts and tools required (minus a soldering iron). There is no cutting or finishing required (no saw dust or fumes!). The kit is very simple to build as it goes together just like ready-to-assemble furniture.

For a full review of this speaker kit, see: Tang Band D4-1 DIY Back Horn Speaker Kit.
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Diaphony8~0.jpg"Diaphony's" An open baffle design5467 views"Diaphonys". A Dipole with a 10" separation between cabinets (21”w *18”h*6”upper cab) to direct reflected waves to the listener. Low distortion driver choices with a SB Acoustics 29RDC-0004 for highs, Usher Audio 8945A for mids, and an Eminence Alpha15A for lows (lower cab same as the upper but extened to 12” depth). These drivers work together nicely together with a 2nd order LR with the low end of the Usher rolling off naturally. Upper cab with a 8" cardboard tube to direct waves from the Usher from the back of the 6" wide speaker box depth to the reflected surface with minimal re-reflection to the back of the driver. I used a 6" diameter plywood rounded baffle ends to reduce diffraction losses and to improve off axis response. Claity SA Caps where important, Solen Fast Caps else where. Goertz inductors with Madisound Sledgehammer for the Alpha 15A. Balic Birch construction with Walnut veneer. The sound? I knew immediately when the SB and Usher were on just a 22" wide by 60" tall board I had made good choices. The cleanest mid I have ever heard. I'm sure there are better ones, but not by much. Voices that were unintelligible on other systems of recordings I know well became understandable - embarrassingly so. A wood block sounds like a real live wood block. I primarily used various tracks off Tania Libertad’s album “Costa Negra and Pacifika’s “Asuncion” for listening tests and crossover tweaking – two extremely well tracked and mastered albums to say nothing of the voices and talent. While listening to track 12 of Libertad’s album “Yo Venco A Ofrecer Mi Corazon”, in my listening area, it becomes to difficult point to speaker placement without visual cues. The Diaphony’s are large, they do need to be about 4 feet away from a back and side wall seem to be the only distracters. Many compliments at the recent Northern California DIY Audio meet outside of Sacrameno, CA.
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DIY-HiVi-Tower-Loudspeakers.jpgDIY HiVi Tower Loudspeaker 5449 viewsSee the HiVi 3-way tower loudspeaker project page for full details of this speaker. Uses the HiVi F8 woofers, HiVi F5 mid-woofers and HiVi SD1.1A tweeters. Crossover is 2nd order at 500 Hz and 4000 Hz.
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DIY-HiVi-Center-Channel.jpgDIY HiVi Center Channel Speaker5430 viewsDIY HiVi Center Channel Speaker using the HiVi F5 midbass driver and the HiVi SD1.1A tweeter. The crossover is 2nd order and at 4kHz.
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Diapony_sandOrion.jpgDiaphony' and Orion5427 views04/2010 Northern California DIY Audio meet
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K-12-Tube-Amp-Kit-with-Enclosure.jpgK-12G Tube Amplifier Kit with "G" Series Case5400 viewsFinished build of a S5 Electronics K-12G Tube Amplifier kit by Rudi Slejkovec in Slovenia. The enclosure is a "G" series case which is also available from the manufacturer.
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DIY-HiVi-Home-Theatre-Speakers.jpgHiVi Home Theater Speakers5372 viewsDIY HiVi home theater speakers. See the project pages for full details.

- DIY 3-Way HiVi Tower Loudspeakers
- DIY HiVi Center Channel Speaker
- DIY HiVi SP10 Subwoofer Project
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The_SetUp.JPGLow noise mic preamp5354 viewsAfter preforming an on street recording of a classical busker with my Cowon mp3 in Florence I decided I wanted to do more recording. The Sony ECM-MS957 stereo mic (not made any more) had too low output to drive my mp3 player line-in or laptop digitizer so I made this low noise, two stage transistor (BC549) preamp (red lid). Because I used large 10uf polypropylene capacitors to ensure high quality sound recordings the preamp, though portable with internal batteries (12V), is quite large. Now I can use my mp3 player (128kps) to make quality recordings anywhere. There is no hiss or processing noise at all. The preamp is dead quiet. The preamp from the ESP site and is extremely easy to build. I use silver wire and silver solder throughout and gold connectors where possible. You can use 10uF electrolytic capacitors where I used polies but for the very best sound use the polyester capacitors. The designer suggests this in his text.

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Hiraga-Super-Class-A-Amplifier.jpgJean Hiraga's Super Class-A Amplifier5348 viewsRear view of a 58W version of the Jean Hiraga "Super Class-A 30W" Amplifier. The amplifier uses a higher rail voltage along with Toshiba 2SA1943 and 2SC5200 transistors. For full details about this project, see the Jean Hiraga's Super Class-A Amplifier page.
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TDA2003-Chip-Amplifier-Visaton-FRS-8-M-Sphere-Speakers.jpgTDA2003 Chip Amplifier with Visaton FRS 8 M Sphere Speakers5319 viewsDIY TDA2003 Chip Amplifier build in a wooden enclosure matched with a pair of Visaton FRS 8 M Speakers in a Sphere enclosure. This set of amp and speakers is used for a PC audio setup.

For more information, see the tda2003 chip amplifier and Visaton FRS 8 M sphere speakers thread on the forum.
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AMPTILT.jpgS5 Electronics K-12M Tube Amp Kit - Side View5298 viewsSide view of the K-12M Tube Amp Kit showing the circuit board underneath and transformers and tubes above.
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IMG_3234.JPGK-12G tube amplifier kit - finished5288 viewsBuilt the S-5 Electronics K-12G tube amplifier kit into an old Kenwood amplifier case. Finished product.
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Underside.JPGPartial Wiring Close up5275 viewsPoint to point wiring is a must in my opinion to achieve what you owe yourself , when it comes to turning the piece of art on . I just wish I could of shown my grandfathers what I have built. This shot shows some of the input stage power supply , Hexfreds , Precision resistors from PRP , and a snippet of the output power supply cap banks for the + / - DC rails that make up the 140 VDC supply.
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