In Reply to: MA-1 blew 7A fuse posted by ChasLieb on July 20, 2014 at 18:42:17:
Did you in fact short the outputs???
Yes, could be a bad new tube, but could also be a failure of the bias supply; if there is no grid bias on any of the 6AS7s, then the affected tube or tubes will "run away" and draw large amounts of current before glowing cherry red and ultimate destruction. Did any of your tubes go south during this event? Check the pins of the output tube sockets. Are there any loose solder joints on wires going to the pins or from the driver tube(s) to the output tubes?
But in the end, call Ralph.
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Follow Ups
- What plugmein said - Lew 08:09:49 07/21/14 (0)