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6550 Tube Blew - A Few Questions

Hi. While listening to my system the other night, I noticed one of the power tubes for the right channel glowed extra bright, and static came through the speaker. I immediately shut down the amp, and haven't turned it back on.

Is it possible to check for damage to the other channel or other parts of the amp without installing a new tube to replace the blown one? I don't want to buy a matched pair and then discover that the amp has other damage.

Is it safe to test each channel with the other channel's tubes removed? Thanks!

Terry
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marakanetz's avatar
marakanetz
5,473 posts
 
Blown bias resistor would prevent tube or pair of tubes(for push-pull amp) to turn on.
rwinner's avatar
rwinner OP
37 posts
 
Just checked the bias resistors. They were easy to spot - 5 watt 10 Ohm jobs. They tested for 10 ohms, all 4. I tested them out of the circuit. What else might I check?
rwinner's avatar
rwinner OP
37 posts
 
It's the front switch. :0
marakanetz's avatar
marakanetz
5,473 posts
 
Mazeltof
rwinner's avatar
rwinner OP
37 posts
 
Yea, I was hoping it was something simple like that. It fooled me, happening right after the tube blew. I guess I learned a little about my amp, though. Thanks a lot!
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