•Why? Because it is wrong. Tubes and surround sound do not mix.

•Vacuum tube home theater sound system

•Built in my garage and basement

•23 tubes total

•5 class AB vacuum tube audio power amplifiers

•One mono-block amplifier: Mono-Block Tube Amplifier

•One quad amplifier: Quad Tube Amplifier

•EL34 output tubes

•Each amplifier is over 400 watts peak output power

•0.45% THD

•20 Hz to 25 KHz -3 dB bandwidth

•6 channel vacuum tube pre-amp/multiplexer

•The following information is provided:

•Summary

•Photos

•Engineering notes and schematics



Summary



This is a good example of a project that has become completely out of control. At some point in the past I decided to build an all-tube home theater system (except for the DSP stuff that decodes the various Dolby 5.1, and etc signals). The result of this effort is affectionately known as "Frankenstein." It consists of 5 class AB tube power amplifiers, tube pre-amps, and a Dolby 5.1/DTS digital signal processor, for a total of 27 vacuum tubes. Each power amplifier is capable of over 400 watts peak output. All of the equipment is mounted in a 7' tall WW2 vintage equipment rack.







Publications



G. L. Charvat, “Vacuum tube home theater system (part 2), vacuum tube power amps for home theater,” Audio Express Magazine, June 2012.







G. L. Charvat, “Vacuum tube home theater system architecture, a “monster” system uses 23 vacuum tubes,” Audio Express Magazine, May 2012.















Press



B. Benchoff, ‘Frankenstein, an all-tube home theater amplifier,’ January 2, 2012.



http://hackaday.com/2013/01/02/frankenstein-an-all-tube-home-theater-amplifier/







Engineering Notes and Schematics







Caution! High voltage. Do not attempt to build anything shown here unless you have taken proper high voltage training. The high voltages present in these tube designs are deadly.







Power distribution notes







Surround pre-amplifier and switch matrix notes