[Amps] 3-500Zs inverted

[Pete Smith N4ZR <n4zr@contesting.com>]

I need to trouble-shoot my QSK system, which is built into my SB-220.  
Will it do any harm to apply filament and plate voltages, but no drive,  
to the 3-500Zs in the inverted position for a few minutes at a time?
--
73, Pete N4ZR
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