[Amps] Re: Ameritron 811

[Eric Dobrowansky]

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