by Ty_Bower » Fri Oct 05, 2012 2:25 pm
I'd start with the basics by first verifying the AC voltages. Make sure that ALL the tubes are out of the amp.
Measure the AC voltage of the first heater winding. You can check this with your meter probes across J3, terminal 1 and terminal 2. You should have a value within ten percent of 6.3 volts AC. You can double check the voltage of the first heater winding by placing your meter probes across pins 2 and 7 at V2. It should be 6.3 volts AC.
Measure the AC voltage of the second heater winding. Put your meter probes across J4, terminal 1 and 2. Again, it should be approximately 6.3 volts AC. You can double check the voltage of the second heater winding by placing your meter probes across pins 7 and 8 at V1. It should be 6.3 volts AC.
Finally, you should verify the AC voltage of the power transformer's secondary winding. Your meter should be rated Category II, and safe for at least 750 VAC. It will say this somewhere on the front of the meter. Put the meter across J6, terminal 1 and terminal 4. The voltage measured should be within ten percent of 660 volts AC. You should double check this last reading by placing the meter probes across pins 3 and 5 at socket V2. The voltage measured should be the same.
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