|[AMRadio] Re: 1930's Old Buzzard Open Rack Transmitter Finally Sees
ne1s at neandertech.com
Thu Feb 23 16:41:35 EST 2006
That was supposed to read "Could you or DON describe the protective bias
circuit you refer to? "
> Thanks for the kudos, John!
> Could you or done describe the protective bias circuit you refer to?
> Probably could figure it out, but the group may be interested as well...
> John E. Coleman (ARS WA5BXO) writes:
>> CONGRADULATIONS A JOB WELL DONE!
>> I really like the choice of tubes. I don't know what a T55 is but
>> probably one of the special Taylor triodes with 55 watts plate
>> Probably not a lot different than the 812s but I know that the 812s are
>> good tubes to use in a class C plate modulated rig especially if used
>> 100% grid leak bias or the configuration that Don, K4KYV, uses where
>> is a safety bias supplied thru a diode and the diode becomes reversed
>> when RF drive causes grid leak bias. The 100% Grid leak bias DOES make a
>> difference in the modulation characteristics of the rig.
>> John, WA5BXO
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