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Type 83 is Mercury and 83-V is vacuum. They are not interchangeable. The 83 has a constant voltage drop due to the mercury vapor and is why it was chosen to be used in this application.
Regarding the SS replacement - without the filament load of the 83 tube, the line adjust may not be able to be adjusted low enough to compensate for today's higher line voltages. One method to correct this is to run the tester from a variac to reduce the voltage to it.
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Tim
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