Good Day All,
Mining "...ye olden junque boxxe" here has yielded an undocumented,
pre-historic Barker & Williamson type "FC-30" encased filament choke --- I
would be most appreciative if I might solicit some feedback from seasoned,
experienced users of this device...
Specifically, the unit has TWO pairs of terminals at EACH END (four per end,
grand total of eight). I show continuity between any two terminals only, i.e.
any one terminal on the LH side, & its immediate opposite on the other...
Simple & logical enough, with two leads coming into it from a filament
transformer, & two leads going out, to the tube's filaments --- but then why
the extra four terminals, two per end? Is it because the "FC-30" is, in
reality, a "dual" type "FC-15" filament choke, & in order to attain 30-amperes
current capability, one must PARALLEL the terminals...?
Also, has anyone ever utilized one of these devices on a frequency band as low
as 160-meters...? These things were manufactured back in the day when there was
no real practical need of any kilowatt linear amplifiers on Topband, due to day
time / night time power restrictions imposed by the old LORAN navigation
system. Consequently, I wonder if this thing even has enough inductance on
1.8-MHz to effectively do the job...?
Up until now, ALL of my filament chokes were of the homebrewed variety, i.e.
heavy-guage enamelled wire coiled around a ferrite rod...I have no experience
whatsoever with this particular pre-manufactured unit, I'm afraid...but I do
harbour thoughts of employing it into a dedicated 160-meter-only grounded-grid
RF amplifier, utilizing a 4-1000A (still to be acquired!).
Many thanks in advance, & my vy
~73~ Eddy VE3CUI - VE3XZ
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|