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That is a fine example of the seldom seen 12" Attache' model. Per CU pricing in the old buying guides, Westinghouse sets WERE more expensive, and in the 12" category, rarely found compared to GE's cheap 12" "Adventurer" models.
I have a 19" Attache' version a few years older and it too has the instant-on. It is simply a rectifier diode (cathode to line side) located on the on-off switch that allows half-cycle AC through to the filament string, blocking it from the B+ line
If the TV has two rectifier diodes as on a full-wave voltage-doubler supply, the on-off switch is two-pole. The 1968 Westinghouse 19" color set's instant on is like this. Westy seemed to get by on half-wave supplies, while others used doublers.
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"When resistors increase in value, they're worthless"
-Dave G
Last edited by DavGoodlin; 02-27-2018 at 10:43 AM.
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