5.1 channel 807 SE amplifier - diyAudio
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Old 23rd February 2011, 11:38 PM   #1
ryuji is offline ryuji  United States
diyAudio Member
Join Date: Feb 2011
Location: massachusetts
Default 5.1 channel 807 SE amplifier

I just finished my project after a few months of planning/assembly but mostly waiting for parts to arrive in mail. Decided to share.

The amplifier has five 807 pentodes running in single-ended fixed bias with Edcor GXSE10-8-5k output transformers. the pentodes are driven by 12AT7's. in addition, i have made use of 12AU7's as pre-amplifiers for all 5 channels, plus a sub-woofer pre-amp for a external solid state amplifier. I am making use of an 5C8S rectifier tube for the 320ma of current required for powering so many channels. The power transformer is a Antek AN-4T400 which is rated for 400VA. The VR-105 tubes are wired in series and used to provide regulated power for grid 2 on the pentodes. Filaments are powered by a modified random pc power supply i tweaked to provide 12.6v

I have pictures i have taken as i built it. Can take more pictures/better pictures of certain parts if people are interested. more pictures can be found at:
ryuji's pictures

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I used multiple schematics to build the amplifier:
Power tube design:
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Pre amp:
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Bias supply:
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Additional information about anything available by request
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Old 26th February 2011, 06:07 PM   #2
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Join Date: Jun 2010
Location: SinCity
Wow nice work!
All my battles have been won, But the war has just begun.
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