28 Jul
2007
28 Jul
'07
11:38 a.m.
William Donzelli wrote:
A lot of TV's from around that period or a little later used selenium
rectifiers directly off the line (no power transformer) with a fair whop of
capacitance in the filters (very low impedance on both sides of the
rectifier). I'm guessing, but surgistors might have been used to limit initial
charge current, rather than for the sake of the filaments. Selenium rectifiers
have more ON-resistance than silicon diodes but I'm not sure if it was enough
to save the junctions in such circumstances.
Surgistors were very popular in the 50's as
either an add-on for TV
receivers or as part of the original chassis.
Filled with the finest snake oil available...