• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Why kind of Vacuun tube is the Tung-Sol TS 930 ??

I've owned many Kepco supplies and have not known them to use house numbers on tubes. But TS 930 sure looks like a house number. They also look like 7027A's which are just glorified 6L6GC's. Perhaps test one as such. Maybe also trace the internal connections to the base to see if pin-out is the same.
 
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A pair on Ebay. $$$
Looks like pin 1 is grid3, pin 2 is grid 2, pin 3 is plate from the rightmost pic. Which does not match 7027 or 6L6GC. If these got used in Kepco's 550V pwr supply model too, they may have requested a pin-out change for socket reliabilty.

Maybe Twinky101 can verify the full pin-out for these type of tubes?
 

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