[Amps] QRO 2500DX MARK lll 4CX800

[Bob Gibson via Amps <amps@contesting.com>]

After sending all three tubes down to be checked at D&C Electronics all three 
tubes came back bad..the test showed..that once the tube comes up to operating 
temperature there is a resistive cathode to grid short present possibly 
indicating a warped grid or screen.. My question is why would all three come 
back the same..I knew one tube was bad but to have all tubes test the same was 
a little odd..Anyone have any ideas..Bob W5RG















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