[Amps] alpha 91b help

[Ron Spencer]

 I've a 91b that is blowing open (well, perhaps a bit strongly worded) the
R4 resistor on the mains board. Its one of the surge resistors in the step
start circuit. It is in series with a 2A fuse which does not open, only the
resistor which is a 10 ohm 15W resistor. I've replaced it with a new one
with same results. Wonder if anyone can point me in the right direction to
fix this problem. I've this same question to the folks at Alpha. 

Thanks!

Ron
N4XD