I am restoring a Model 46-1201 code 130 Bing Cosby radio/phono and need a good set of schematics and or parts list? Also, any advice on replacing the R100 and R7 "air" resistors? Thanks.
I'm working on the Canadian version of one of these 1201 series radio/phonographs, make sure that you find a schematic with the same code number as the one on the set as there were a lot of running changes made. Take a look at my thread in the Philco Radio discussions section.
Best Regards
Arran
.....what the heck is a "air resistor"? Ive run across lots of different type resistors in all my yrs past servicing vintage tube-type equip, but Ive never run across a "air resistor" yet! Not saying they dont exist at all!! Inquiring minds want to know. Pls post a photo if possible! Best of luck restoring your vintage Philco!!
I think they were referring to the wirewound resistors typically encased in a flexible cloth like fabric, might be asbestos, so be careful. If they're not open, they're probably good. Note bene, previous remarks about today's line voltage, especially on line operated battery sets. If the filament voltage is too high, add on or replace this resistor with one of a higher resistance to get the supply voltage back in line. I have doubled the value in the '46 and '48 "roll top" portables after recapping, and still get great sensitivity and plenty of volume. Use a 5 watt type, better yet a 10 watt type, and keep it away from other components.