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Crusher, do you have the cutoff resistor wired directly to the cathodes of the tubes? I ask this to insure a current path from ground in the event the fuse opens under load. That will keep the cathode voltage at a safe level so the tube doesn't arc inside. Then to key it you just use the relay to add the bias path through the diodes, never allowing the cathode voltage to float with an open connection.

[QUOTE="Shockwave, post: 444598, member: 10882"] Crusher, do you have the cutoff resistor wired directly to the cathodes of the tubes? I ask this to insure a current path from ground in the event the fuse opens under load. That will keep the cathode voltage at a safe level so the tube doesn't arc inside. Then to key it you just use the relay to add the bias path through the diodes, never allowing the cathode voltage to float with an open connection. [/QUOTE]

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