Can Bad PWR Tube damage amp or preamp tubes??

[nemp]

My 6V6s are wistleling but can't afford new tubes. How long can I go like this before damage to amp happens?

[Blue Strat]

It's unusual for power tubes to whistle, are you sure it's not a microphonic preamp tube? Check out this FAQ
http://www.kcanostubes.com/FAQ/FAQ.htm

If one of your power tubes shorts out, it could take some other components with it. This could include your output transformer which would lead to a costly repair.

I would suggest having the amp looked at by an amp tech.

Mike K
KCA NOS Tubes
http://www.kcanostubes.com

[BlackBart]

I had power tubes whistling in a Mesa 2:90. Sounded more like wind than a whistle. Other than the whistling, the tubes were working fine. I got fed up with listening to it, so I replaced them.