|
|
|
#3
09-08-2004, 01:18 AM
|
||||
|
||||
|
Is it just a single winding coil or is there a primary and a secondary? As the coil is adjustable the construction details would not be that critical. A new coil of approx the same size and slug should work. Don't use tinned wire though, as skin effect would force most of the high frequency current thru the solder coating. Which has higher resistance than copper and would reduce the Q.
|
|
#5
09-08-2004, 09:45 PM
|
||||
|
||||
|
I haven't see a coil quite like that before. Try to salvage it. I'd try using some Elmer's glue or such to reinforce the paper core. Or fingernail polish stolen from the lady of the house. Prehaps you can use a partial paper shim to hold the slug where it's loose but ending before it gets too tight. If the slug won't stay put, maybe glue it to a tuning wand that you then permantly attach to the set from above or below the chassis or circuit board once adjusted (maybe thread the plastic rod and use a nut attached to the chassis or board)? Or maybe some wax paper cap wax melted into the coil to hold the slug once it's adjusted (but can be freed later if needed)?
|
| Audiokarma |
|
#7
09-09-2004, 10:31 AM
|
||||
|
||||
|
Somebody out there has got to have one NOS, right? Have you tried Moyers yet? I found a coil for a CTC-31 that I thought was pretty obscure, they had several NOS on the shelf.
__________________
Bryan
|
|
#9
06-02-2009, 04:08 AM
|
||||
|
||||
|
I need one of those 95-2263 Injection Transformers for my 24MC32, also. Bought this set from someone who told me he broke the coil while trying to align the set. I bought that set over a year ago, and still have had no luck obtaining a replacement. There are several companies on the Web listing it as available with a price of about $22.00, but calling them to inquire about it always yields the same "We don't have any, can't get them, not sure why the Web still lists it as available." response. Every inquiry so far has been a dead-end. If we could just determine how many turns in each winding, wire sizes, locations of the taps, etc. then I'm sure one of us could then arrange to have broken coil assemblies rewound on new coil form stock and installed into the old housings. I'm researching this on my end. Doesn't Surplus Sales of Nebraska sell various sizes of coil form stock? What are the "L" values for the various windings? Are the windings conventional or pi-wound? I doubt that rebuilding these transformers would prove to be as difficult as, for example, rebuilding of a 15GP22. Does anyone have a coil-winding lathe capable of rewinding RF/IF coils?
|
|
#10
06-03-2009, 04:52 PM
|
||||
|
||||
|
Can you post a picture? I bought a bunch of coil formers from Gateway electronics in St. Louis for 25 cents each which would probably do the job. The coil should not be too critical to make by hand.
|
| Audiokarma |
|
#11
06-03-2009, 05:26 PM
|
||||
|
||||
|
I've got the chassis removed from the set but the coil is still housed in its "can" on the chassis. As I recall, the form is 1/4" diameter. I'll remove the "can" and post a picture of the coil inside as time permits.
|
|
#13
06-04-2009, 03:08 AM
|
||||
|
||||
|
Learned how to repair actual component faults in some cases, thus eliminating the need for replacement of otherwise salvageable parts. My experience with RF/IF and similar coils/transformers is pretty limited. Previous owner of this set did considerable damage to the transformer, far beyond my ability to salvage. I could remove the complete 95-2263 transformer assembly from my set and send it to someone who had successfully repaired other units once someone with the proper tools and experience to do "surgery" on one can be located.
Seems like it would be "challenging, but not impossible" for someone with very sharp eyes and very steady hands. Duane seems to be AK's foremost Zenith roundie expert so far. Perhaps he knows someone with advanced coil-winding tools or some NOS parts? Additionally, since 3.58 MHz is just slightly below the 80-meter Amateur band, perhaps a Ham operator with extensive design and construction experience specific to equipment for the 80-meter band could replicate the windings on new coil form stock and thus re-build faulty coils for the right price? I would be willing to pay a "rebuilding fee" to someone who could successfully rebuild my damaged 95-2263 transformer. As for how much, approximately equal to the list price quoted by those vendors whose Web sites list NOS of these parts that can't seem to actually be found to sell. Last edited by jshorva65; 06-04-2009 at 03:44 AM.
|
 |
|
|
Linear Mode
