The 3-500Z tubes in my AMP INT 3-500ZC amplifier are shorted between
filament and grid. There may be more wrong but this is a start.
Question. What is my best source for obtaining the 3-500Z tubes? Are
Eimac tubes still available? Do I want the ZG with the graphite anode?
Will the G require any changes in the amp? Do I need a matched pair?
What about non-USA made tubes?
Thanks again,
Bee, K4JLD
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