• 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.

Bewitch 300b no sound

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kevinkr

kevinkr

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Joined 2004
kta-hifi.net
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Some additional details would be really helpful, things like what it is connected to, some history such as whether it is new to you or previously worked and has now quit, whether or not you have checked the source (sources), speaker wiring and presence of AC power. (apparently it powers up) What has changed since the last time you used it?

Do the filaments glow, does in hum or buzz or do anything else?

Are the speakers (still) connected to it.
 
A

audiowize

Member
Joined 2005
Measure DC voltages between ground and each pin of the 300B. Repeat with the driver tubes if you see more than 300V on pin 2 and more than 50V at pins 1 and 4 of each 300B socket. (If you see 300+V at pin 2 but less than 50V at pins 1 and 4, measure pin 2 and look for negative voltage)
 
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