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my 4 tube battery set 39-70 has 5 tubes and an AC cord??
David
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#14

10-28-2014, 08:42 PM
Looking at the tube line up and comparing to data sheets the person who did the change over knew his stuff. Orginal audio amp tube 1H5G which has a grid cap, 12Q7 also has a grid cap replace tube socket and rewire. Post war tube 12SQ7 no grid cap. The more common rectifier tube in a AA5 would have been 35Z5 but your set has a 35Z3 LOK base tube. Me thinks war time fix or just after the war. Looks like a good project to restore with the changes would like to see your hand drawn sch when you finish.    Good Luck David  
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RE: my 4 tube battery set 39-70 has 5 tubes and an AC cord?? - by David - 10-28-2014, 08:42 PM



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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration