Same thing happened with a Russian GU84B tetrode in the Emtron DX-2SP,
at my local radio club. The resistive cathode to grid connection only
becomes evident as the valve heats up. Strange.
73, Alek. VK6APK
On 30/03/2019 4:37 AM, Bob Gibson via Amps wrote:
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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