Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Model 89 coil rewind..did anyone save their notes?
#9

Alright, looks good.

For the RF, you shouldn't get continuity from 1 to 4 based on my coil.. I have the primary, which is the small coil that goes bad, marked 1.68 ohms on the schematic, between pins 1 and 3. Again, that's 13 turns clockwise, with the bottom of the coil (nearest the lugs) connected to 3, top to 1.
The secondary is something like 100 turns, connected between lug 5 and 2, with lug 4 going to a center tap to select the police band. I don't have more specific notes on it.
I would clean off the old coil (make your own notes, just to be sure. Drag a needle across the windings to count them). Once you do that check the measurements again, it's possible they are shorted, but not likely. Our two radios could also have different parts, I suppose. You aren't talking about the antenna coil, are you? That one also goes bad, from lightning.

For the oscillator coil, the culprit is the tickler winding, on the bottom of the outside coil. Over a piece of decaying celluloid. It is between lugs 1 and 2 on your diagram, 1 at the top, 2 at the bottom. 27 turns. FYI, it is erroneously marked 5.25 ohms on the schematic. Expect about 1 ohm from your new coil.
The primary is the small form inner coil, connected at the top to the loose wire, and the bottom to lug 4.
The secondary is the outer coil under the tickler, lug 5 is the top, 3 is the bottom. All are also wound clockwise looking at the bottom.

I was dreading the rewind, but it went really smoothly. The hardest part is getting them out around the capacitors. Let me know if you need any more info, everything is still on my 'work bench' Icon_biggrin


Messages In This Thread
RE: Model 89 coil rewind..did anyone save their notes? - by skyscraper - 02-11-2014, 10:17 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM
Preliminary work on wife's Silvertone 2014
Hello roy, that great news glad it worked out for you !! Sincerely Richardradiorich — 10:50 PM
Preliminary work on wife's Silvertone 2014
Safety caps arrived today.  Soldered one in and had a successful first power-up.  No magic smoke escaped and it tunes in...glyphmon — 09:53 PM

[-]
Who's Online
There are currently no members online.

>