10-28-2014, 07:42 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
