[Amps] 3-500Zs inverted

[gdaught6 at stanford.edu]

Pete asked...

> 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?

Going to the authoratative scriptures, the Eimac data sheet says "The 3-500Z must be 
operated vertically, base up or base down."

73,



George T Daughters, K6GT
CU in the California QSO Party (CQP)
October 4-5, 2014