>...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
** 10x is a new record. The highest I've seen is 8x.
>> I have been around a lot of amps ..... Every amp that had a parasitic
>> blowup episode used a 3-500Z . I'm talking TL -922 , SB-220 , AL 80 , AL
>> 80a ,AL82, SB-1000 , Drakes, Viewstars & more ... If it has a 3-500z
>> ....it WILL someday hand grenade, I had two go off next to me , my friends
>> SB220 & AL80.... blowing parts everywhere & dreaded grid to filament
>> shorts.......I have no confidence in that tube. Every time I use an amp with
>> a 3-500z in it , I am waiting for the big bang .....
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- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,