>
>Hi Pete,
>
>Filament current on the 3-500Z is around 15 amps per tube. Fourty millohms
>(.04 ohms)
>of contact resistance, for instance, is enough to drop the filament
>voltage by 0.6 volts,
>or 12% of the nominal filament voltage (Vf nom= 5.0 Volts). I don't know
>where the cathode
>emission of the 3-500Z really starts to fall off, but one can easily see
>that it doesn't take
>much extra contact resistance in series with the tube filament to have a
>significant effect
>on the filament voltage and ultimately the electron emission. Since the
>filaments got noticeably
>brighter after the contact treatment, I suspect that improved cathode
>emission was the
>mechanism responsible for the increased output power.
>
What is the voltage between pin 5 and the socket contact #5?
What is the voltage between pin 1 and pin 5?
tnx, Mike
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
end
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