Tom, you say:-
[Snip from Rich]
>> Allowing more inrush current to a 3-500Z filament than Eimac's spec.
is
>> definitely a minus. {TL-922}. The easy fix was to specify a
>> current-liniting core for the filament transformer. Cost seems to be
an
>> unlikely factor here.
>You overlook the fact the filament is a series string. The equalizing
>tap does NOTHING during start-up, because the tubes cold
>filament resistance is much lower than the ESR of the equalizing
>winding.
What has the equalising tap to do with using a current limiting core? I
don't understand it - could you explain? Guess I'm just being thick, but
the series heater connection doesn't to my mind make any difference if
the current is limited.
73
Puzzled
G3RZP
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