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Philco 89 (123) (Update-Coil rewind)
#16

gary rabbitt Wrote:Here are the questions I am dealing with right now.

***Is this the winding that needs to be rewound after the "baking in the oven" procedure? As seen in the photo it's the smallest winding.

***How many turns should it have? I believe I have the same diameter wire on hand.Looks like about 29 to 32 turns.

*** Is the winding just one layer?

I assume there are no taps on this winding. The diagram shows just a small coil on the Cathode of the 36 tube.
NOTE: I had measured this winding when I first started and it measured 150 Ohms. The spec says 5.25 Ohms.
Probably part of my original problem.

Okay, Gary...let me answer your questions in order...

1. Yes, that is the winding that always goes bad. Bake the coil in your oven at 180-200 degrees for about 30 minutes. Remove from oven and wipe off the excess wax.

2. The cathode winding, which is the winding your arrow points to in your picture, should be 28 turns of 38 gauge enameled magnet wire. Wind the turns clockwise as you are looking at the bottom of the form (where the lugs are).

I should add at this point, that you should throw away that old nitrocellulose insulator under that winding, and use Mylar tape instead as insulation between the inner and outer windings. You can hold the beginning and end of the winding in place with dots of hot glue, carefully applied.

3. Yes, just one layer. No taps.

When you are done, spray the coil with some clear Deft or other clear lacquer. This will protect the coil much better than the wax ever did.

Good luck.

--
Ron Ramirez
Ferdinand IN


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