The only issue with the radio after I finished recapping is that I accidentally hooked the AM loop antenna to the FM antenna connector and Vice-Versa. once that was corrected it works just fine, no re-alignment needed.
Cleaned and lubed all pots and bearings.
Cleaned the FM/AFC/AM switch.
Cleaned most of the Cadmium Sulphide off the chassis.
Cleaned the dust and spider webs out of the case.
Implemented the following safeties:
recapped (of course).
replaced selenium rectifier with a silicon diode.
larger surge resistors
polarized plug
rear interlock keyed for the polarized plug.
1 tube tested bad on my tester but I am debating whether to replace it at this time.
3 comments:
i am putting 2 33ohm 5 watt in front of the 1n4007 diode will this be ok?
It is not really necessary to put a voltage dropping resistor unless the voltage is really high. There is already a 22 ohm resistor there and if the voltage is within 10 volts plus or minus of 140vac on the plus side of the diode, that is ok.
putting your Zenith M730 on line really helped me . I too found one bad tube but here is how it went....it was a 6t8 tube i replaced it with a new tube and then the radio would not work. then i looked up what tube should be there,it a 14gt8 now it works, i know shame on me for not looking at the schematic first.
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