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Originally Posted by rca2000
I think it is 50GY7. A number of them are available on ebay now !!
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Looks like you're right, 50 not 58.
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The diode would have a tendency to short and run the tubes at excessive voltage, until one burns out.
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With the tubes now adding up to 75V I'd have about 8V to burn off to get to 83V, so with the diode I'd use a deliberately maxed out in wattage resistor to drop that voltage. Idea being if the diode shorts out, the resistor would then burn out, like a fusable resister.