Good Morning All,
Am I missing something here...?
Extensive research here into years & years of ARRL HANDBOOKS, Bill Orr
HANDBOOKS, and the internet have shed precious little light in the matter of
optimum / minimum values of inductance for plate chokes in the B+ leads of our
tube-type linear amplifiers.
Have a look-see yourself: in designs that feature amplifiers that only go as
low as 3.5-MHz, you'll see chokes that range in value anywhere & everywhere
from 200-uh, to 50-uh. On 160-meters, I've seen quoted values as high as
1.0-mh., and others as low as 200-uh.
Just what, exactly, is a "...minimum reactance" for a choke, on a given
frequency band, to do its job effectively, anyway...?
I know confusion can creep in in the form of the self-destruction of these
parts if the hapless home brewer happens upon a band where there's
self-resonance in the choke...but that issue aside, is this all some matter of
"...by gosh & by golly black magic", or are there very real minimum standards &
parameters that we should adhere to...? And if so, where are said standards
published...?
I certainly can't find them via "...the usual" routes --- but again, I must be
missing something here...
~73~ Eddy VE3CUI - VE3XZ
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