38-60 Gonna be a lot of Trouble - Printable Version
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+--- Thread: 38-60 Gonna be a lot of Trouble (/showthread.php?tid=16390)
38-60 Gonna be a lot of Trouble - PAradiogeek - 03-18-2017
Hi,
I finally decided to tackle the 38-60 that I've had for a few years. To say the least, it is in rough shape. The speaker cone is pretty much gone, the dial scale is cracked and the top side veneer is completely missing. Those are some of the obvious problems, but yesterday I found another one. Probably not surprising to anyone, but the BC antenna transformer's primary winding is open.
I previously rewound a model 19 oscillator tickler coil. It was relatively straightforward to remove that coil form and then replace the open coil. In this case, I'm not sure how to remove the coil form from the chassis. It is held in place, but I can't figure out how. Does anyone know the correct way to remove this? I don't want to damage the form.
If I can get the coil out, I'm sure I can count the turns, but does anyone know what gauge of wire to use for this? I have a couple of sizes of magnet wire on hand (#32 and #36). Would it be critical to use the correct wire gauge, or can I just use the closest size that I have?
Thanks
Jon
RE: 38-60 Gonna be a lot of Trouble - Radioroslyn - 03-19-2017
So which ant coil? Both the BC and SW?
Long answer is take it apart and rewind. BC coil is going to be about 19' of 38ga wire.
Short answer is parallel #1a w/a 100pf mica cap.
RE: 38-60 Gonna be a lot of Trouble - PAradiogeek - 03-19-2017
Hi Terry,
It is just the primary side of the BC antenna xfrmer. The SW ant. xfrmer has no open coils. I guess I'll have to get some 38ga wire.
Really not sure how the coil form fastens to the underside of the chassis. If anyone has thoughts on how to remove the coil form, I'd appreciate their input. Otherwise, I'll keep looking...
Thanks Terry!
Jon
RE: 38-60 Gonna be a lot of Trouble - Radioroslyn - 03-19-2017
Post a pic or two of the top and bottom of the transformer. Most have a couple of screws in the top that secure the coil and the can has a couple of spring fasteners that you squeeze with a pair of needle nose pliers the pop the can off.
RE: 38-60 Gonna be a lot of Trouble - PAradiogeek - 03-19-2017
Terry,
Here are 3 images.
In the first (38_60_Ant_Coil_1), the BC antenna coil is the lower right coil form of the four. The front of the chassis is toward the top of the image.
The second image (38_60_Ant_Coil_2) is from the side, the BC coil is in the lower left. The front of the chassis is toward the right side of the image.
The third image (38_60_top_side) shows the top of the chassis. The BC antenna is to the left of the big cap can, beneath the tuning cap assembly. I don't see any screws underneath the tuning cap.
From images 1 and 2, it looks like there is a whole assembly with a right-angled bend that is mounted beneath the chassis. Maybe there is a screw coming from the top side of that?
Jon
RE: 38-60 Gonna be a lot of Trouble - Radioroslyn - 03-19-2017
Not seeing what I was thinking of. I'd put a 100mmfd cap across the top of the pri over to top of the secondary and be done w/it.
RE: 38-60 Gonna be a lot of Trouble - Kenneth F. Besso Jr. - 03-19-2017
looks like it attached to that flooding chassis,,of the tuner,,I see screws to that tuning chassis is separate ,,in Pic 1,,,WOW
RE: 38-60 Gonna be a lot of Trouble - PAradiogeek - 03-19-2017
I looked at it again, it seems like the coil forms attach to a "band switch sub-sub-chassis" which is attached to the RF sub-chassis. Modular design gone haywire
I guess I'll start by pulling the RF deck and take it from there. Maybe when I get that out I'll be able to see how these coil forms attach. I would prefer to rewind the coil if possible. I'll keep the idea of using a cap to shunt across the windings in my back pocket.
Thanks for all the help Terry, much appreciated!
Jon
RE: 38-60 Gonna be a lot of Trouble - Kenneth F. Besso Jr. - 03-20-2017
Happy Trails,,My Friend-----CHEERS
RE: 38-60 Gonna be a lot of Trouble - PAradiogeek - 10-01-2017
Hello again everyone. It has been a slow summer for me radio-wise. I am finally...almost done with this radio.
My question now is this. Does anyone know of a source for the chassis washers that support the RF sub-chassis on a 38-60? One of mine got damaged in removing the sub-chassis from the main chassis. I looked on Radio Daze and didn't see anything that looked quite right.
Thanks in advance.
Jon
RE: 38-60 Gonna be a lot of Trouble - morzh - 10-01-2017
Tried Renovated Radios yet?
RE: 38-60 Gonna be a lot of Trouble - PAradiogeek - 10-01-2017
I had not thought of them, but I will give them a look. Thanks for the tip.
RE: 38-60 Gonna be a lot of Trouble - Finished - PAradiogeek - 10-17-2017
I finally finished this set a couple of days ago. I needed to:
1) Get the speaker re-coned.
2) Install new veneer on the top. First time for me.
3) Perform some rather significant cabinet repairs, as the cabinet itself and various parts of the veneer were literally coming unglued.
4) Replace the open antenna transformer. I decided to buy a replacement from AES. Seems to work great.
5) Install a new photo finish on the front. First time for me.
6) Recap and re-carbon as usual.
This was probably the most difficult restore I've done so far. At times it really challenged my patience. I actually had to remove the RF sub-chassis twice because of a boneheaded move I made
The mounting bracket for the shortwave antenna coil had broken at some point in the past, so I fashioned a new way to mount it. What I didn't realize until I had it all back together and tried aligning the SW band, was that my mounting bracket actually shorted out the SW antenna coil. I never even looked to see if that might be happening! In order to undo what I had done, I had to take it ALL...BACK...APART...ugggghhhh!!!Thankfully, that is all in my rear view mirror now and overall, I am happy with the result. It receives great on both bands. Here are a couple of photos
A big thank you for everyone's input throughout.
Jon
RE: 38-60 Gonna be a lot of Trouble - WallaceRoger - 10-17-2017
Nice!
RE: 38-60 Gonna be a lot of Trouble - morzh - 10-17-2017
Looks really nice.