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:
http://ryujiwarui.com/photos/main.php?cmd=album&var1=tube/
Schematics:
I used multiple schematics to build the amplifier:
Power tube design:
Pre amp:
Bias supply:
Additional information about anything available by request, just post a question
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:
http://ryujiwarui.com/photos/main.php?cmd=album&var1=tube/
Schematics:
I used multiple schematics to build the amplifier:
Power tube design:
Pre amp:
Bias supply:
Additional information about anything available by request, just post a question