[Amps] 3-500Z parasitic wows

[Pete Smith]

At 03:57 PM 8/22/02 -0400, WA2BPE wrote:
>...Had this happen to me with an old SB220 destroying one tube; luckily (??),
>they were about to be replaced anyways.  Later investigation showed that the
>resistors in the parasitic chokes had increased between 5 & 10x their original
>value.  I was "fortunate" - only the tube arced with no other damage.

Which "this" is that?  A parasitic, or a random grid/filament short, or 
arcing due to a mismatched load, or a Rocky Point arc?  There are lots of 
things that can happen with a manually tuned amp, and I'd be more inclined 
to look at other things to blame besides a workhorse tube that is probably 
in more amateur amps than any other...


73, Pete N4ZR
Sometimes a tower is just a tower