Most 6 v , not just Chrysler were + ground . Plus or - had no real advantage at first . So probably 55 300. Was + ground ( 6v) 12 v tubes ( that will run without vibrators to step up volts ) came on scene contemporary with 12v cars ; radio design with those new tubes ( about 54) required generally that anodes of tubes are + , so the normally grounded tube cathodes are -. There was a real reason to go - ground then.
However transistors used in output were temperature fussy PNP germanium , and required the opposite , why the mica washers and sort of inverted design of output stage of those hybrid radios common in our 12v cars . Later NPN silicon transistors run the same polarity as tubes, all is happy . If you do jump a car backwards generally your radio is toast , transistors will blow and Electrolytic capacitors fry . Before fuse blows.. Sent from my iPhone not by choice On 3 Oct 2020, at 4:11 pm, Cox Scooter465@xxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:
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