Quote:
Originally Posted by astral highway
It's possible that your valves are biassed rather above their recommended grid current as it is...
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This isn't as clear as I meant. Obviously, we normally talk about a grid bias
voltage. I just re-checked an the recommended bias voltage is between -116V and -160V, if that helps...
What I'm saying here is that as these are power devices, the manufacturer does also state a maximum grid current. It's 220mA absolute max for grid 2, from the Russian data sheet.