11-24-2018, 10:25 PM
The recap went fine. I restuffed the electolytics - I happened to have another nickel over copper can like the remaining Philco cap.
Restuffing the blocks was made much easier thanks to Steve Davis' Philco Service Tools. Awesome!
The contents came out of the metal cans easily - including the filter block.
[Image: https://farm5.staticflickr.com/4912/3106...70b8_z.jpg]
[Image: https://farm5.staticflickr.com/4820/3106...f486_z.jpg]
After replacing the filter caps and restuffing half of the blocks I decided to bring it up on the variac.
It had good volume but only received noise / static. That is until I moved my hand near the grid cap of the 1st detector when it suddenly started receiving clearly. Uh oh....
That made me pretty suspicious that a coil was bad. I went through them and found that sure enough part 15 (Part No. 3884-V) ('Detector Transformer') had an open primary. A common problem on this era of set.
Fortunately the Philco Repair Bench has info on exactly this issue:
http://www.philcorepairbench.com/rewindi...-rf-coils/
I pulled the coil and you can see from all of the green spots that it's exactly the problem described:
[Image: https://farm5.staticflickr.com/4841/4602...d136_z.jpg]
Restuffing the blocks was made much easier thanks to Steve Davis' Philco Service Tools. Awesome!
The contents came out of the metal cans easily - including the filter block.
[Image: https://farm5.staticflickr.com/4912/3106...70b8_z.jpg]
[Image: https://farm5.staticflickr.com/4820/3106...f486_z.jpg]
After replacing the filter caps and restuffing half of the blocks I decided to bring it up on the variac.
It had good volume but only received noise / static. That is until I moved my hand near the grid cap of the 1st detector when it suddenly started receiving clearly. Uh oh....
That made me pretty suspicious that a coil was bad. I went through them and found that sure enough part 15 (Part No. 3884-V) ('Detector Transformer') had an open primary. A common problem on this era of set.
Fortunately the Philco Repair Bench has info on exactly this issue:
http://www.philcorepairbench.com/rewindi...-rf-coils/
I pulled the coil and you can see from all of the green spots that it's exactly the problem described:
[Image: https://farm5.staticflickr.com/4841/4602...d136_z.jpg]
