>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?
? Bee - - RF Parts is OK.
>Are Eimac tubes still available?
? No. Triton bought out Eimac's glass tube division.
>Do I want the ZG with the graphite anode?
? Graphite anodes do not have the weak spotweld problem that late
production Eimac and early production Triton tubes with metal
anode-radiators have been plagued with. Maybe Triton solved the problem
by increasing spotweld-I?
>Will the G require any changes in the amp?
? No but the ZSAC should be adjusted to 75 to 85 mA per tube fot SSB.
> Do I need a matched pair?
? Probably not.
>What about non-USA made tubes?
>
? Are graphite-anode 3-500Zs manufactured in the U.S.?
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