Posted by bill epstein [ 65.189.211.118 ] on December 04, 2006 at 07:38:30:
In Reply to: Boy, is this a dull forum... posted by SteveBrown on November 14, 2006 at 18:32:13:
Fried a resistor on the driver stage of the 45 amp the other day.
Bad driver tube took it out. Or bad CCS mosfet took out the tube, or...
Have had a problem with the turn-on surge of the B+. Even damaged the other channels mosfet.
In looking over the problem and replacing the bad parts at the WSOTT meeting Saturday, Steve suggested implementing a switch on the B+. With a .01uF 2kV cap across the terminals.
Last night I installed it. On the center tap connection to ground.
Just a SPST 250 VAC, 10 amp rated toggle.
Powered up and let the filaments warm up for a few minutes, then closed the switch. No flashes or crackles, which I had previously.
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