In a message dated 7/15/2006 8:47:32 AM Eastern Daylight Time, r@somis.org
writes:
Lou == The SB-220 uses a current-limiting type filament transformer
that allows no more than 60% of the 3-500Z's rated filament inrush
current to flow, so step-starting the filament is unnecessary.
However, the inrush current to the HV transformer is such that it
will eventually erode the contacts of the ON/OFF switch, so a step-
start is still useful.
end
Yes, I thought that filament transformer was designed that way, but if
confronted with the question on a YES or NO basis, Would it be best to cycle
the
filaments or leave them on during a session on the air? BTW the Ameritron
manual states that the filament transformer is designed with "impedance" that
essentially step starts the filament. Lou
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