>
>Hi again,
>
>And thanks a bunch to the several who have commented
>and made specific tune up recommendations! Have
>followed them this morning. Rich, I chickened out at
>just about 345 watts of drive, hi.
// The 3cx3000A7 is rated at 2.5A. If one drives it to less current,
one will not get the right E/I ratio for the extant tank.
> The grid current was
>approaching/bit exceeding 300 mA; Henry manual says
>to not exceed 350 mA.
// Eimac rates the 3cx3000A7 grid at 225w. Typical cathode-grid
potential is c. 190Vrms. With 1000mA of grid-current one would be
dissipating c. 190w in the grid.
However such grid-current would be quite likely to make for less suds
out. Thus, the best policy is to tune for max out with max in.
> at All of this into the Bird
>load, of course. Bird 43 with a 5kW slug was of no use,
>it is way too slow and does not respond to the 50 wpm
>dits.
// With pulse tuning the 43 works a relarive indicator, which good
enough.
>
>Anyway I found that once the tune and load controls were
>at resonance, they did not seem to need to be tweaked
>as the drive was increased beyond 100 watts or so.
// If I-anode changes and E-anode is constant, RL changes.
>
>Hope this is correct, ...
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
end
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