[Tube-Swap] 3-500z

[Mike D.]

> The 811A, 572B, 3-500Z, 4-400, etc. utilize a thoriated tungsten filament,
> which is highly dependent upon sufficient filament temperature to provide
> adequate electron emission for normal operation. Emission increases as the
> thorium migrates towards the surface of the filament wire. This
> is why it is
> recommended to "burn in" these tubes before operation

Does the burn in procedure differ for 3-500ZG tubes? I have some new spares
sitting on a shelf.

73 de Mike, N9BOR
A-1, FISTS, JARL A-1, SMC
http://www.qsl.net/n9bor

di dah dit - The only Roger Beep you'll ever need.
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