5.1 channel 807 SE amplifier

[ryuji]

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

Design:
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

Pictures:
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








Schematics:
I used multiple schematics to build the amplifier:
Power tube design:

Pre amp:

Bias supply:


Additional information about anything available by request

[807tubenut]

Wow nice work!