[AMPS] Tube question

[Phil Levin]

Needless to say, while working on this SB-200 to six conversion. I was
originally using  the new set of matched Svetlana 572B's  (from D&C
Elec., BTW, gud deal..only $102.00 matched) one of the tubes went into
parasitic oscillation and before I could kill the main power switch it
finally killed the circuit breakers.  Now this one tube has a burn spot
on both sides of the anode and the tube glass adjacent to it is
mirrored.  Does this necessarily mean the tube is  weakened/not matched
to the other tube??  I don't have a hi-pot to test them.

I am presently using an old weak set of Cetron's for the testing!

Tu for reading,

Phil W2GE


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