Hi Guys:
Appreciate your generous help on my previous matters.
Permit me kindly to ask for help on this one.
I have a 1948 homebrew using 2 each 1625's in RF deck.
Its modulated by 2 each 807's.
It works.
But - I'm not sure that I have the grid bias at the 'proper value'...and the
output is lower than I'd expect for these tubes..unless they're weak...which
could be since I've been hard on the rig in my attempt to get it operating.
Presently, the grid bias is at -56 volts.
The 'Book' says -90 for telephony @ 600 volts on the plate ( I've got 700 ).
The gent who built the rig - W2PLY - apparently used -35 volts or a C
battery.
The two 1625's are in push-pull and link coupled to the output coax.
Sooo..the big question is...how do I know if I've got them at max ouptut?
Tnx,
Steve
WA2TAK
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