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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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B2BO_ICEPower_1000ASP_modules_Par-Metal_Case.jpg
B2BO_ICEPower_1000ASP_modules_Par-Metal_Case.jpgB&O ICEPower 1000ASP modules4575 viewsThis is a high power audio amplifier project that I recently completed. The amplifier used two B&O ICEPower 1000ASP modules. Each amplifier module is rated at 1000 Watts. The two amplifier modules are housed in a Par-Metal aluminum case. The amplifier sounds amazing with my Epos ELS303 speakers.

See the other photographs.

Ed
Detroit, MI
USA
Nelson-Pass-Bride-of-Zen-BoZ-Preamplifier.jpg
Nelson-Pass-Bride-of-Zen-BoZ-Preamplifier.jpgNelson Pass Bride of Zen (BoZ) Preamplifier4572 viewsThis is my slant on Mr Pass’s Bride of Zen (BoZ). Big Ruskie 0.1uF 40y-9 PIO military caps handle front-end de-coupling while 10uF polypropylene caps sit at the back. The 40y-9 caps are foil, paper in oil, glass encapsulated then metal encapsulated and sound divine. An Alps blue velvet potentiometer attenuates the input controlled by a 4 oz solid brass knob. Metal film resistors and silver plated wire wrap wire add quality to the custom build. This preamp is built on a strip board. The JFETs are 2SK170 BL. The RCA plugs are gold plated, 5% WBT silver solder is used throughout. Two 10,000uF caps (snubbed) ensure a dead quiet supply and loads of bottom-end. The enclosure is a Hammond anodized Aluminum case.
Nice Mongrel Dog.
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DSCN0744.JPGCustomized K-16LS Tube Amplifier Kit4566 viewsAmong the many modifications, most notably I removed the pot and replaced it with resistors and an power indicator LED.
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IMG_1874.JPGriverrat373's K-502 Tube Amp Kit - Front4551 viewsFront view of the K-502 Tube Amplifier Kit with transformer cover.
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IMG_1875.JPGriverrat373's K-502 Tube Amplifier Kit - Side4544 viewsSide view of the K-502 Tube Amp Kit.
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9pin-to-octal-adapter.jpg9 pin to octal tube adapter4498 viewsI wanted to verify that a 12AT7 was equal to a 6SL7 in the OD2.5. So this is an adapter made from an old octal tube base and a 9 pin socket. It worked and yes the tubes are interchangeable. I will check the frequency response and distortion and see if there is any difference, but sound wise they seem the same.
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2~0.jpg2SK1058 Single-Ended Class-A Amplifier. Retro style design.4445 viewsRetro style design Class-A power amplifier with zero negative feedback. It was built based on the schematic of DIY Class-A 2SK1058 MOSFET Amplifier project by Mark Houston.
For more pictures and details, please visit http://alexkap.com.
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LM3875-Gainclone-Chip-Amp-I.JPGLM3875 Gainclone Raosting Pan / Chip Amplifier4417 viewsThis is my first LM3875 Gainclone / Chip Amp. It was constructed following some of the notes from this LM3875 Gainclone / Chip Amp in a Roasting Pan. The volume control (potentiometer) is an ALPS Black Beauty. All soldering was done using silver solder. The bridge rectifier and capacitors are all snubbed with small, but good quality capacitors.
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LM3875-Gainclone-Chip-Amp-TF.JPGLM3875 DIY Gainclone / ChipAmp4410 viewsThe front view of my LM3875 Gainclone project. The layout and idea is from the LM3875 Gainclone in a Roasting Pan. The power transformer on top is from an old Yamaha subwoofer that quit working. Power supply capacitors are four 6800 uF and two 4700 uF which are snubbed. Power switch, LED and volume control are at the front.
5-channel-LM3875-chipamp.jpg
5-channel-LM3875-chipamp.jpg5 Channel LM3875 ChipAmp / Gainclone Amplifier4393 viewsI was looking for a simple way to integrate 5.1 surround sound into a projector / PC based home theater a while back and then the idea hit me, I had just finished a 2 channel gainclone for my PC desktop with phenomenal sound. So here is my incarnation of a 5 channel gainclone. The case is custom, cherry front and back sections and plate Aluminum for sides, bottom and top. The heatsink was a leftover from an Advanced Energy RF amp. It is driven from an SB Live sound card. See the other photos.

See the gainclone amplifier pages for more chipamp ideas.
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LM3875-Gainclone-Chip-Amp-TR.JPGLM3875 Gainclone / Chip Amp with Baking Pan Enclosure4392 viewsThis LM3875 Gainclone was built following the basic idea around the LM3875 Gainclone in a Roasting Pan. The power transformer is from an old Yamaha subwoofer that stopped working. The power supply consists of four 6800 uF and two 4700 uF capacitors.
K-12G-Tube-Amp-Rear.jpg
K-12G-Tube-Amp-Rear.jpgK-12G Tube Amplifier Kit (rear view)4386 viewsRear view shot of Lofton's build of the S-5 Electronics K-12G Tube Amplifier Kit. More information and details about this build are available in the K-12G Tube Amp Kit Build Thoughts thread on the forum.
EL84-Push-Pull-Inside.jpg
EL84-Push-Pull-Inside.jpgDIY EL84 Push-Pull (PP) Tube Amplifier4385 viewsEL84 Push-Pull Tube Amplifier constructed following Bruce's DIY EL84 Push-Pull Tube Amplifier Project documentation.
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KJ1-Class-D-Amp-KJ2-Passive-Linestage.JPGAMP6 Amplifier + Passive Linestage4366 viewsTripath T-Amp using a 41Hz Amp6 T-Amp module and a toroidal power transformer. The linestage uses a top quality rotary switch and Gold Point attenuator. More info and FPD files are available on my project page.
Cheers, Keith
OatleyK281.jpg
OatleyK281.jpgOatley Electronics sub-mini tube/chip amp hybrid K2814354 viewsThere has been a number of hybrids over the years but none more unusual than Oatley Electronics, of Sydney Australia’s, Jan6418/LM1875 kit amp. Not crazy enough for you? How about we throw in a 24VDC International regulated switch mode power supply and build the finished amp as a dual mono construction? Crazy? You expected less from Australian Justic Branko owner of Oatley? Still not crazy enough? How about the amp only puts out 5W. Yes the chip is capable of 20W easy! Think what you can do with this kit.
This is my dead stock, out of the box build. And it sounds bloody great! Good sonic depth with chip amp holographic sound stage and tight, exceptionally controlled bass. And all for AU$29 plus shipping. Nuts!!! Not crazy enough. I added twin UV LEDs on the front panel to indicate when both modules are powered. That’s Crazy.
Audio-Research-VS55-Tube-Amp.jpg
Audio-Research-VS55-Tube-Amp.jpgAudio Research VS55 Tube Amplifier4350 viewsAudio Research VS55 tube amp. I didn’t buy this amp, but had it in my house for some listening tests. Quite impressive, but has a lot of background noise. Uses EH 6550 valves.
KT88-Single-Ended-Tube-Amp.jpg
KT88-Single-Ended-Tube-Amp.jpgKT88 Single Ended Tube Amp - Inside View4350 viewsInside view of my KT88 Single Ended Tube Amplifier projct. The circuit is just like Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier.

For the power supply I used some UF5408 diodes for the B+ and 6A10 for the heaters (they are on a heat sink as they dissipate a lot of power). Bypass capacitors for the driver stage are Rubycon ZL and for the power stage Nichicon. The B+ is lower to improve tube life.

More information and pictures are available on my build log: SE KT88 Tube Amp.
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SV101481.JPGSubwoofer Analogue Processor4341 viewsThis OP amp based subwoofer processor is a kit available from the local Jaycar electronics shop. There is a lot of soldering and construction so it is not hard to miss a few solder joints. I did. On the first few listens I can see there is a lot of tuning and balancing to be had. I am using a monoblock chip amp / gainclone to provide the final power.
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Underneath.JPGJupiter Bees Wax and Paper Capacitors - OPA2134 Opamp Preamplifier4340 viewsWhen you get bored with high voltage valve amplifiers you start to look to other things to get your audio gear junky fix. I have always like the weird combos of materials in coupling/audio caps. I started with Jupiter Bees Wax and Paper caps and built a preamplifier around them. They are the dynamite sticks you can see. These are hand made and have silver connecting wire. Pure silver wire was used throughout and silver solder. Alps blue velvet attenuator and gold plated RCA add to a rich mix of components. The active bit is the Burr-Brown OPA2134 in milled sockets. Two sets of inputs are switchable and each channel has its own virtual power. This unit runs from a 26V 3.5A computer power pack. A timber suspended, tar and heavy Al foil dampened floor provides the base for the cct. brds. which sit on standoffs and are rubber grommet dampened. The lid and base of the thick die-cast aluminum case are also tar and foil lined.
STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit-Chassis.jpg
STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit-Chassis.jpgSTA1 DIY Tube Preamp Kit (12AU7/ECC82)4338 viewsThis is my finished STA1 tube preamp kit from Lighthouse Electric. This design uses three 12AU7 tubes. I prefer the 12AX7 tube preamp kit that I built over the STA1.
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