The only way for a step start resistor to burn up is to have the step start
relay NOT engage or the contacts are bad. Now that you report this, it
sounds like a bad tube. You said in the beginning that the amp was OK
without tubes inserted, then when you inserted the tubes the step start
resistor
burned. You had 2 problems, the step start circuit and a bad tube. Now
you have a bad tube that caused the power supply to go. It did not go
before because the step start resistor limited the current on the primary of
the
transformer and it burned up before the power supply blew. Looks like you
need a tube or two?
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