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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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Nelson-Pass-Bride-of-Zen-BoZ-Preamplifier.jpg
Nelson-Pass-Bride-of-Zen-BoZ-Preamplifier.jpgNelson Pass Bride of Zen (BoZ) Preamplifier4480 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.
B2BO_ICEPower_1000ASP_modules_Par-Metal_Case.jpg
B2BO_ICEPower_1000ASP_modules_Par-Metal_Case.jpgB&O ICEPower 1000ASP modules4480 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
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IMG_1874.JPGriverrat373's K-502 Tube Amp Kit - Front4476 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 - Side4470 viewsSide view of the K-502 Tube Amp Kit.
DIY-Acrylic-Platter-Turntable.jpg
DIY-Acrylic-Platter-Turntable.jpg4461 viewsFor this DIY turntable I used 1-inch thick acrylic for the platter and plinth, a Pro-Ject tonearm, 2.5-inch machined aluminum legs and built opening glass top and base. The motor is suspended in aluminum case and is vibration free. I also built in a remote on-off so there are no wires showing anywhere.

Also see the video on YouTube - DIY Turntable Scott 299 amp

Ken V. - New York, USA ( this on YouTube @ DYI Turntable Scott 299 amp)
9pin-to-octal-adapter.jpg
9pin-to-octal-adapter.jpg9 pin to octal tube adapter4448 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.4392 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.
LM3875-Gainclone-Chip-Amp-I.JPG
LM3875-Gainclone-Chip-Amp-I.JPGLM3875 Gainclone Raosting Pan / Chip Amplifier4334 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.
EL84-Push-Pull-Inside.jpg
EL84-Push-Pull-Inside.jpgDIY EL84 Push-Pull (PP) Tube Amplifier4332 viewsEL84 Push-Pull Tube Amplifier constructed following Bruce's DIY EL84 Push-Pull Tube Amplifier Project documentation.
LM3875-Gainclone-Chip-Amp-TF.JPG
LM3875-Gainclone-Chip-Amp-TF.JPGLM3875 DIY Gainclone / ChipAmp4331 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.
Audio-Research-VS55-Tube-Amp.jpg
Audio-Research-VS55-Tube-Amp.jpgAudio Research VS55 Tube Amplifier4312 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.
LM3875-Gainclone-Chip-Amp-TR.JPG
LM3875-Gainclone-Chip-Amp-TR.JPGLM3875 Gainclone / Chip Amp with Baking Pan Enclosure4312 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.
STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit-Chassis.jpg
STA1-12AU7-ECC82-DIY-Tube-Preamp-Kit-Chassis.jpgSTA1 DIY Tube Preamp Kit (12AU7/ECC82)4297 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.
5-channel-LM3875-chipamp.jpg
5-channel-LM3875-chipamp.jpg5 Channel LM3875 ChipAmp / Gainclone Amplifier4297 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.
K-12G-Tube-Amp-Rear.jpg
K-12G-Tube-Amp-Rear.jpgK-12G Tube Amplifier Kit (rear view)4296 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.
KT88-Single-Ended-Tube-Amp.jpg
KT88-Single-Ended-Tube-Amp.jpgKT88 Single Ended Tube Amp - Inside View4272 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.
Sansui-SR-1050C-Fully-Manual-Turntable.jpg
Sansui-SR-1050C-Fully-Manual-Turntable.jpgSansui SR-1050C Turntable4253 viewsA Sansui SR-1050C, fully manual phono turntable.

I did the following mods to it:

1- Installed a new Shure m350ed cartridge
2- Replaced the belt
3- Added a belt strength regulator screw (the original design didnt have it)
4- Replaced the RCAs with gols plated ones
5- Replaced the Saprk Killer cap with X2 cap.
6- Installed ferrite chokes on audio and power cable.
7- Installed an EMI-RFI filter

It sounds and works great now.

Bernardo
KJ1-Class-D-Amp-KJ2-Passive-Linestage.JPG
KJ1-Class-D-Amp-KJ2-Passive-Linestage.JPGAMP6 Amplifier + Passive Linestage4250 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
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Underneath.JPGJupiter Bees Wax and Paper Capacitors - OPA2134 Opamp Preamplifier4248 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.
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SV101481.JPGSubwoofer Analogue Processor4246 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.
614 files on 31 page(s) 15


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