Most likely the tube in the socket with the blown resistor has developed an
internal short. Call Ameritron and ask for replacement tubes if they are
under warranty. I have repaired two 811s where one or two of the 811 tubes
have internally shorted, causing the 51 ohm resistors to repeadly fail until
the tubes were replaced. There is a high failure rate with the 811 tubes
MFJ/Ameritron is supplying with new amplifiers. They appear to be of the
cheapest Chinese variety. One owner gave up after two replacement sets from
MFJ, and went with a set from RF Parts, and has not had the cover off of the
amp since!
Eric
KE2D
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