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Re: New silicon diode, no sound

24.205.20.241

Todd,

First, now don't get mad, but is there a STANDBY switch on your unit? BTW---what exactly, was suppose to measure 48 volts? This is WAY TOO LOW, if this is the power tube's anode plate voltage (usually B+). Usual plate voltages are ten times or more (around 500 volts) for the EL34, in push-pull, AB1 configuration.

Did you check all the B+, C+, D+ voltages after you replaced the bridge? These are the taps that energize the power tubes and the gain stage/phase inverters plates.

The bias supply is usually a separate tap off the power transformer. It has its own rectifier and filter circuit---so it it's possible that your main rectifier is putting out A+, but the other taps (B+, C+, and maybe D+) are NOT connected BUT your bias supply is working.

Result? Measurable A+ voltage. Measurable bias voltage. No sound.

Check the continuity between A+ and B+, if you get no voltage off of B+.

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