View Single Post
  #4  
Old 08-31-2015, 02:44 PM
walterbeers walterbeers is offline
Old TVs are better!
 
Join Date: Jun 2011
Location: Omaha NE
Posts: 463
I replaced the paper capacitors, and still no stations come through. Audio works, and I get buzz if I touch the terminals on the volume control meaning that the audio output circuits are working. I am kind of thinking that one of the IF cans might be bad, or possibly the resistor/capacitor network. IF cans have continuity, but something is killing the radio 455 khz signal. If I put a 455 kHz signal from an RF generator, into the grid (through a small capacitor) of the 12BA6, I have nothing. The first IF can has four terminals, and the second IF can has 5. RCA numbers 970441-12 and 970441-11, also part number 540-542 and 540-548. The Sams is 309-14. It's almost embarrassing being stumped by a simple 5 tube radio. Where can I find 455 Khz IF cans? JW miller, Thordarson, had them, and others. Cross reference?
Attached Images
File Type: jpg scan0001.jpg (92.9 KB, 24 views)
Reply With Quote