03-12-2013, 11:48 PM
The output transformer was bad on my 46-350 also. I got a second one and used the original for parts. Where did you get your replacement?
Just on general principles, could the AVC in your radio be open somewhere if you can't bring station volumes down to reasonable levels? I'm definitely not clear on how the AVC works on this radio, but it looks like the AVC voltage is filtered inside the 2nd IF can. It might be that R302, 22K Ohm, which (I think) is inside that can, is open. If not, there might be other resistors in the AVC circuit that are open.
Philco's number for that can is Z301. I'm pretty sure their intention was for you to replace the whole can instead of replacing components, so they don't show the location of the components inside it in their service package, but both the Philco and Rider schematics show that resistor surrounded by a dotted line along with the If transformer coils and other components.
There is also a 2.2 Mohm resisitor R301. I'm probably missing something, but I don't see you can get your AVC voltage without going through those 2 resistors.
Just on general principles, could the AVC in your radio be open somewhere if you can't bring station volumes down to reasonable levels? I'm definitely not clear on how the AVC works on this radio, but it looks like the AVC voltage is filtered inside the 2nd IF can. It might be that R302, 22K Ohm, which (I think) is inside that can, is open. If not, there might be other resistors in the AVC circuit that are open.
Philco's number for that can is Z301. I'm pretty sure their intention was for you to replace the whole can instead of replacing components, so they don't show the location of the components inside it in their service package, but both the Philco and Rider schematics show that resistor surrounded by a dotted line along with the If transformer coils and other components.
There is also a 2.2 Mohm resisitor R301. I'm probably missing something, but I don't see you can get your AVC voltage without going through those 2 resistors.
John Honeycutt
