Radiomobile wireless for early Bristols
Probably the main reason why these sets are polarity conscious is the use of electrolytic capacitors which are themselves polarity concious. In the case of the radiomobile 100 as fitted to the 400 Bristols,there are three all in the 12 volt supply circuit and are used to filter interference from the cars 12 volt system and that generated by the vibrator itself.These can be replaced with modern capacitors which are no longer polarity concious.I have so modified a radoimobile 100 which now works well on both +ve or _ve earth. It is now surplus to requirements as I no longer have my 400, so if any one would have a use for it please phone me on 01845 567 519 N.Yorkshire.
Best wishes, Gerald.
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