1st detector winding - Printable Version

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+--- Thread: 1st detector winding (/showthread.php?tid=25024)

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1st detector winding - TimG - 05-13-2024

Hi, I’m new to the phorum. I’m completing an electronic restoration of a Model 90 (2-45s). The outer winding on the 1st detector coil is open. What is the wire size and number of turns?

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RE: 1st detector winding - morzh - 05-13-2024

Count the turns as you unwind them.
Note the direction. Even if not important, it's a good practice.
Gauge is not superimpirtant.
39-40 is ok.

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RE: 1st detector winding - GarySP - 05-13-2024

Welcome to the Phorum, TimG! Another option is to run a needle gently down the coil and count the 'bumps'. Each bump is one turn.
You may want to see the restoration of a Model 90 by our founder, Ron.
https://philcoradio.com/library/index.php/shop-talk/rons-radios/philco-model-90-restoration-part-5/

Take care and BE HEALTHY! Gary

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RE: 1st detector winding - Radioroslyn - 05-13-2024

If you are speaking of the primary of #7 I used 96t of 38g wire.

https://philcoradio.com/library/download/service%20info/service%20bulletins/Philco%20Service%20Bulletin%2056.pdf

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RE: 1st detector winding - Radioroslyn - 05-14-2024

Hi Tim,

Pardon my manners it was kinda late last post. The 1st gen 90's (p/p 45's) and the 2nd (se 47) use the same rf plate coil. The 3rd gen (p/p 47's) has a different IF frequency so I would think some of the rf parts are going to be different. Probably not the rf amp coil.

https://philcoradio.com/phorum/showthread.php?tid=24784

When you have the tuning cap out to replace the grommets under it do take the screws that fasten the stator plates in place loosen one by one and re-tighten one by one. My set had an intermittent problem where the volume would drop down abt 1/2 after a hour of use. 10 or 15 mins later it would resume at full volume. Very annoying. That was the fix.

Welcome to the Phorum
Have fun chasing electrons!

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