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

Thread Rating:
  • 1 Vote(s) - 5 Average
  • 1
  • 2
  • 3
  • 4
  • 5

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
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM
First Radio restoration
You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM
Zenith H725
Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately. More ...EdHolland — 10:18 AM
Graphics for majestic 1050 dial glass.
Murf; I found this thread on the ARF, the first photo has a pretty good view of the dial glass. Regards ArranArran — 01:12 AM
Zenith H725
hello Ed, how about that speacial tape used for ducting it's like foil or how about thin piece of aluminum roof flash...radiorich — 12:19 AM
Zenith H725
Ed; One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM
Zenith H725
I just remembered, I have some hi temp silicone rubber material which could do the trick. Or a piece of FR4 laminate. Th...EdHolland — 08:39 PM
Zenith H725
The PSU filter cap arrived today (thank you USPS!) so I will work on that later. Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM
Philco 610B oscillator wiring
Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM

[-]
Who's Online
There are currently 2630 online users. [Complete List]
» 2 Member(s) | 2628 Guest(s)
AvatarAvatar

>