Rivera Clubster 45 ?

[gtrplayr1976]

So a friend sends me a message . He was trying to troubleshoot a noise in his Rivera, so he put two old EL34s in it ,but one has the guide broken off (says he didn't notice) When he powered the amp he heard a pop ,and nothing after. Put the old tubes back in ,and nothing. I don't see internal fuses at the power tubes. I can't tell without seeing it. Does anyone have an idea of possible damages ?

Thanks a heap.

[Enzo]

There probably is a blow fuse. it doesn;t need to be hear the powr tubes to be blown by them.

Look at the tube, the heater is a very low resistance between pin 2 and 7 inside the tube. Just think of it as a wire, which if you think about it, is what the heater really is anyway.

Takes just a few seconds to make up a chart. There are 8 ways a tube can be put into that socket, just one is correct. SO go down the list and see what pins 2 and 7 short out. One step around and pins 2 and 7 are now shorting pins 3 and 8. That would short B+ to ground. Bye bye B+ fuse. One more step and pin 1 and 4 are shorted - screen B+ to ground. Next stop 5 to 2, and so on.

Your heater wires either have a center tap grounded or a pair of resistors to ground. A short between B+ and either heater pin will likely burn out one of those.

And so on.

[gtrplayr1976]

There probably is a blow fuse. it doesn;t need to be hear the powr tubes to be blown by them.

Look at the tube, the heater is a very low resistance between pin 2 and 7 inside the tube. Just think of it as a wire, which if you think about it, is what the heater really is anyway.

Takes just a few seconds to make up a chart. There are 8 ways a tube can be put into that socket, just one is correct. SO go down the list and see what pins 2 and 7 short out. One step around and pins 2 and 7 are now shorting pins 3 and 8. That would short B+ to ground. Bye bye B+ fuse. One more step and pin 1 and 4 are shorted - screen B+ to ground. Next stop 5 to 2, and so on.

Your heater wires either have a center tap grounded or a pair of resistors to ground. A short between B+ and either heater pin will likely burn out one of those.

And so on.

Thanks Enzo. Since the amp is 4 hrs away I won't have it until the 25th, so I will have a better idea then ,and I can use the info you provided for me.

Thanks again.