11-23-2013, 01:35 PM
Today I took the remaining IF transformer off the chassis. I took the internal parts out and put new wires of the right color code on using stranded 22AWG wire of 600V insulation. I need to attach similar wire to the other IF transformer that I repaired. Unfortunately I did not have the wire when I reassembled it. So, I will have to attach new leads near the bottom somewhat inside the shield and use some heat shrink tubing to keep them insulated.
After I got the last IF transformer off I took more pictures and removed the tuning capacitor. I also removed the one trimmer cap that has its stud above the chassis. There was considerable corrosion in the chassis metal at that spot due to the mouse pee. With all these parts off, I scrubbed the rest of that end of the chassis once more with waterless hand cleaner with pumice in it using the find stainless steel wire brush. It cleaned up pretty well.
There is some remaining corrosion where the mounting clamp for C78 was located. I may go ahead and drill out the rivets that hold the clamp on and clean the chassis there too. If that is out of the way, the only other thing still left in place would be the power transformer. I may go ahead and remove it too. That way I can completely clean the top of the chassis in preparation for spray paint.
This radio chassis has an ink stamped ID on it saying:
Model 40-201 (the 1 is almost eroded away)
Code 122
And there is stamped into the chassis metal U87162, which I assume is the serial number of the radio.
In the photographs you can see the area where the tuning capacitor was mounted. That area is cleanest.
This chassis has a jack on the back to plug in a phonograph plus a toggle switch next to it. This appears to be a factory option, not an add-on done later. The bakelite plastic around the jack actually says Phonograph Pickup and is a 1/4" phone jack type that interrupts one set of contacts and makes another. Since that is the case, I wonder why the switch. I need to trace this out and see what they really did to the circuitry.
After I got the last IF transformer off I took more pictures and removed the tuning capacitor. I also removed the one trimmer cap that has its stud above the chassis. There was considerable corrosion in the chassis metal at that spot due to the mouse pee. With all these parts off, I scrubbed the rest of that end of the chassis once more with waterless hand cleaner with pumice in it using the find stainless steel wire brush. It cleaned up pretty well.
There is some remaining corrosion where the mounting clamp for C78 was located. I may go ahead and drill out the rivets that hold the clamp on and clean the chassis there too. If that is out of the way, the only other thing still left in place would be the power transformer. I may go ahead and remove it too. That way I can completely clean the top of the chassis in preparation for spray paint.
This radio chassis has an ink stamped ID on it saying:
Model 40-201 (the 1 is almost eroded away)
Code 122
And there is stamped into the chassis metal U87162, which I assume is the serial number of the radio.
In the photographs you can see the area where the tuning capacitor was mounted. That area is cleanest.
This chassis has a jack on the back to plug in a phonograph plus a toggle switch next to it. This appears to be a factory option, not an add-on done later. The bakelite plastic around the jack actually says Phonograph Pickup and is a 1/4" phone jack type that interrupts one set of contacts and makes another. Since that is the case, I wonder why the switch. I need to trace this out and see what they really did to the circuitry.
