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DIY-Record-Player.jpgDIY Record Player using Dual 701 Motor6507 viewsNandor built a stacked plywood plinth and a magnetically stabilized tonearm to go with his direct drive motor assembly from a vintage Dual 701 record player.
See the DIY Record Player project page for full details.
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LM3875-Gainclone-Breadboard.jpgLM3875 Gainclone on Breadboard6485 viewsLM3875 Gainclone. The circuit is the same as Mark's LM3875 Gainclone. Most of the parts are from Dick Smith which can also be found at Radio Shack.
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DIY-HiVi-Swans-M1-Speakers.jpgDIY Swans M1 Speakers - HiVi Research6481 viewsDIY build of the Swans M1 Speakers from HiVi Research.
See DIY HiVi Research Swans M1 Speakers
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NCDIYMeet042010a.jpgNorthern California DIY Audio meet Roseville, CA 04/24/20106462 viewsNice meeting with Sigfried Linkwitz guest speaker
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Diaphony7.jpg"Diaphony's" An open baffle design6447 viewsConstruction
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AMPTILT.jpgS5 Electronics K-12M Tube Amp Kit - Side View6422 viewsSide view of the K-12M Tube Amp Kit showing the circuit board underneath and transformers and tubes above.
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DSCF0800-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier6402 viewsFor those that are less willing to create their own cases. Here is a completed DIY-GENE Mark Levinson Clone 60Watt / Ch Dual Mono Amplifier. It is hernia inducing weighing in at nearly 50Kg. The kit comes with most of the amplifier electronics built and tested and with all the casing components. All you need to do is to build the PSUs and put it all together. This example has 2 x 65-0-65V at 10A each. It runs very HOT as you would expect a high output Class A amplifier to run. Great care must be taken to mount the 12 x Output Transistors correctly, a small mistake cost me over £60.00 in burnt components. Note the Capacitor connections and the extremely BEEFY PSU.
Built by Andy Freestone
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Pass_Aleph_4_DIY_Amp_Project.jpgVariant of the Aleph 4, a true 100W Class-A amplifier6385 viewsBuilt on a budget of less than £200 (mostly E-Bay). It generates some 400W of heat so the heatsinking is massive as are the power supplies. It uses 24 x IRFP244 MOS-FETs which are closely matched into groups of 6. This is the most exhaustive part of the build. Other than that the design is incredibly simple. PCBs are available from www.kk-pcb.com, although my article at diyAudio.com details the process and patterns that I used for my own build.
In the guise that you see in the photo, this amplifier runs at an internal temperature of 45 degrees C on a warm British Summer day, which is well below the 70-80 degrees that Nelson himself allows for his commercial products. The sound quality is simply STUNNING. I’m running an Arcam CD36 / Pumpkin-Shuntky Pre-amp / Passive Attenuator / B&W DM633 with Chord Chorus Silver Interconnects. The bass slam is accurate and endless, the sound stage perfect and the midrange just sweet as a nut. This replaced my A700, itself a clone of a Mark Levinson design, and absolutely knocks the ML into the ground.
The full project build can be seen at http://www.diyaudio.com/forums/pass-labs/172276-aleph-4-strickly-diy-project-build.html
Andy Freestone
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DSCF0797-C.JPGDIY-GENE Mark Levinson Clone 60Watt Class A Amplifier6384 viewsFor those that are less willing to create their own cases. Here is a completed DIY-GENE Mark Levinson Clone 60Watt / Ch Dual Mono Amplifier. It is hernia inducing weighing in at nearly 50Kg. The kit comes with most of the amplifier electronics built and tested and with all the casing components. All you need to do is to build the PSUs and put it all together. This example has 2 x 65-0-65V at 10A each. It runs very HOT as you would expect a high output Class A amplifier to run. Great care must be taken to mount the 12 x Output Transistors correctly, a small mistake cost me over £60.00 in burnt components. Note the Capacitor connections and the extremely BEEFY PSU.
Built by Andy Freestone
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Stereo_and_Seas_FA22RCZ_in_Open_Speaker_Enclosure.jpgSeas FA22RCZ Fullrange Speakers6368 viewsShown in the photo is my hi-fi stereo setup with and new pair of open cabinet speaker which I built. The diy speakers use a single Seas FA22RCZ driver per cabinet. The Seas FA22RCZ is a 200 mm (8") diameter fullrange driver with a sensitivity of about 94dB. The cabinet has an open bottom, see the Seas FA22RCZ Fullrange in Open Speaker Cabinet photo for more details.
The sound is very clean, open and free of compression artifacts, similar to open baffle speakers. Nevertheless, it has a satisfying bass depth.
See my blog for more information. It is written in German but you can use the Google translate tool on the right side of the page to translate.
Kind regards,
Carsten Bussler from Germany
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2-channel-Hi-Fi-Setup.jpgGio's Two Channel Hi-Fi Setup6362 viewsThis is my current 2-channel setup. NAD C521 CD player, NAD C162 preamp, DIY 50EH5 Tube Amp which drives Radio Shack 40-1310 Super Tweeters) and LM3886 Chip Amplifier (Gainclone) which drives a pair of BD-Pipes with Radio Shack 40-1197 drivers. The small box on the bottom right is a Slim Devices Squeezebox.
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dual_channel_2sk1058_2sj162_Mosfet_Power_Amplifier.jpgDual Channel 2sk1058 2sj162 Mosfet Power Amp6337 viewsThis is a dual channel 2sk1058 / 2sj162 mosfet power amplifier, built to be used a main L+R amplifier for my system. I had the amplifier tested after construction to ensure it was within rated specs - each channel is 200W (8 ohm) / 320w (4 ohm) @ 0.003% THD. I have designed a remote turn-on circuit to integrate with my receiver. Each channel has its own power supply with soft start on the line side of toroidal transformers. Cooling is achieved by tunnel heatsink assembly and a PWM fan controller. At start-up fan speed is 30%. Small thermistors are attached to the inside of the heatsinks to monitor temperature. Inputs are electronically balanced.
Ashley Webber
Brisbane , Australia
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Hiraga-Super-Class-A-Amplifier.jpgJean Hiraga's Super Class-A Amplifier6329 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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LM3875-Chipamp-Enclosure.jpgLM3875 Chipamp Enclosure6319 viewsThis is my LM3875 DIY Chipamp / Gainclone . Please see the other pictures for more details.
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P37aFinishedS.jpgElliott Sound Discrete transistor preamp P37A6316 viewsI made this for a very loyal customer with nothing but a schematic and vero-board. Worked first time. Low current draw (~3mA @ +/- 16V). The sound is very clean and flat. This preamp will definitely please the purist solid state amp lovers.
See the project page for the schematic: Minimalist Discrete Hi-Fi Preamp - Project 37, Revision A
More information about this build is available from the Elliott Sound Products Discrete SS Minimalist Hi-Fi Preamp thread.
Mark Houston
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K12G-Tube-Amplifier-Kit-Zach.jpgZach's K12G Tube Amplifier Kit6294 viewsFront and rear views of the K12G Tube Amplifier Kit put together by Zach.
For more information about these inexpensive tube amp kits, see the S-5 Electronics DIY Tube Amplifier Kits page.
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AMPWOOD.jpgWood Frame for Tube Amp Kit6287 viewsBubinga and Walnut wooden frame finished with Tung Oil.
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DSCN0746.JPGK-16LS Customized Tube Amplifier Kit6278 viewsAdded silicone dampers to the tubes and upgraded the lamp-switch power cord to an IEC jack.
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K-16LS-Tube-Amplifier-Kit.jpgK-16LS Tube Amplifier Kit from S-5 Electroncis6265 viewsThis is a stock build of a K-16LS Tube Amplifier Kit available from S-5 Electronics. The tube amp kit comes with a pine board so you will need to find a suitable enclosure you can fit the amp in or you can build you own enclosure.
See the DIY Tube Amplifier Kits page for more information about the various S-5 Electronics kits.
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DIY-HiVi-Tower-Loudspeakers.jpgDIY HiVi Tower Loudspeaker 6263 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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