To get a rough estimate, make an adaptor to change the basing to conform to a 6L6. Pin 1 is empty, pin 7 and 8 of the 7591 is pin 2 and 7 on the 6l6 plug, pin 5 on the 7591 is goes to pin 8 on the 6l6 plug.
Pins 3 and 4 are the same for both.
Then test as a 6L6.
:Does anyone know settings to use for testing this tube ?
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:thanks -Jim
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