Quote:
Originally Posted by vortalexfan
Hello everyone, today I just picked up a 1930s vintage battery operated Coronado Radio of which I don't know the model number and I'm trying to locate the service literature for it.
It is in really decent shape yet, but someone at some point in time wired a power cord up to the antenna hookup and I'm hoping no one actually attemped to plug it in that way otherwise this radio may be a shelf queen, it looks really clean underneath as well and looks like there was no servicing done to the radio (except to the battery cables and the addition of the power cord onto the antenna hookups.)
what kind of batteries were used to power this radio and does anyone have any idea which model this might be?
pictures below.
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It's a model 650A-B-C in Riders vol 8.
Those are 2 volt filament tubes using 90 volts B+. Chances are, the antenna coil might not be damaged, if 120 ac was applied.
It's easy to build a power supply because it uses only a A+ & B+ source.
Doesn't use a grid bias supply.