[Milsurplus] More Progress: Cheap Tubes for the BC-375

[David Stinson]

Well, it turns-out I don't need to pentode-connect
the 1625 in the PA.  With both MO and PA 1625s
triode-connected, I actually get a little more power
out and the PA will neutralize just fine.

With 400V B+:
CW Carrier 16W out
AM PEP 35W out

I didn't need to mess with the filament resistor links.
Just plug-in the 1625s with 27V A+.
The filament meter will read about 13 V and the 1625s
will work, leaving the resistor links correct should
one wish to go back to 211s.
I still had 211s in the modulator and,
with the aforementioned 27V A+, their filament
meter reads 10V as normal.  Soon, I will build
two more triode-connected 1625s for the modulator.
If they work OK, I'll pop the B+ up to about 650V,
near design max, and I expect about 40W carrier,
80W AM PEP out.
I would call that "good enough."  Not 3dB worth
of gain between 40W and 70W.

GL OM ES 73 DE Dave AB5S

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