• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

B/A 20-4 tube mono block??


2007-08-02 12:05 am
I bought a tube amp mono block,and I can't find any info on it on the web.I would like to get my hands on a copy of the schematic to work on it,Its a B/A HI/FI model BA-20-4,tubes are 2-12AX7,2-6BQ5,1-Z80.Controls are Contour,Loudness,Bass,Treble"on/off",5 way input selector.I know its not worth much,but I always wanted to restore a 6BQ5 push/pull,I am tired of playing with 6V6's.