Radio Philco 60B. - Printable Version

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+--- Thread: Radio Philco 60B. (/showthread.php?tid=25959)

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Radio Philco 60B. - sergio - 08-27-2025

Good morning, I apologize, I use Google Translate.
Belatedly, let me introduce myself:
I'm Sergio, from Italy. I'm 80 years old and a self-taught antique radio enthusiast.
I found a Philco 60B at a flea market and am trying to get it to work. I rebuilt all the Bakelite and electrolytic capacitors, replaced the resistors and other capacitors that were out of tolerance, and checked the medium-frequency, input, and oscillator transformers. I noticed that the secondary winding of the oscillator transformer had been rebuilt. Checking the DC resistance, I measured 1.88 ohms instead of 3.4 ohms. The wire diameter is approximately 0.2 mm, or, if I'm not mistaken, AWG32.
Do I need to redo the secondary winding? I don't have any information.
Could any experts help me?
Thanks in advance.
Sergo.

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RE: Radio Philco 60B. - morzh - 08-27-2025

Sergio

I think, with a Philco 60, you could benefit from this article.
https://philcoradio.com/library/index.php/shop-talk/model-notes/evolution-of-philco-model-60/
As for rewind or not to rewind, it is the number of turns and the directions that are important; the DC resistance is not really important as a thicker wire could result in less resistance, while not really affecting the functionality.

I do not have the number of turns, but perhaps someone has it.

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RE: Radio Philco 60B. - MrFixr55 - 08-27-2025

Hi Sergio,

Your translation is excellent, and if it wasn't, don't worry. We are friendly here.

I found a link to a "thread" from our founder, Ron Ramirez (God rest his soul, he has passed away), that explains the Model 60 Oscillator and antenna coils. Here it is:
https://philcoradio.com/phorum/showthread.php?tid=4675

Just to make sure, I am reprinting the info here:

Model 60 Antenna Coil

Primary (outer) winding - 4 turns, CW, bottom to top, 38 gauge
Secondary winding (on the coil form) - All CW, bottom to top. 25 turns from beginning (lug 1) to lug 3. 129 turns from lug 3 to lug 2. 20 turns from lug 2 to lug 5. 32 gauge works well for this winding.

There is also a separate winding inside the coil form, mounted at the top. It is approximately 250 turns, 38 gauge.

Model 60 Oscillator Coil

Primary (outer) winding - 18 turns, CCW, 38 gauge, bottom to top, lug 3 to lug 2
Secondary winding (on the coil form) - All CW, bottom to top. 15 turns, lug 1 to lug 4. 90 turns, lug 4 to lug 5. 22 turns, lug 5 to lug 6 (on top). 32 gauge is OK for the secondary.

To determine which lug is lug 1, 2, 3, etc., hold the coil by the large mounting lug and count the small lugs clockwise from left to right.
--
Ron Ramirez
Ferdinand, IN

When rewinding, the direction of the windings is important. If the secondary is original, it is important to verify that the windings that were under the primary are not shorted due to corrosion or missing lacquer insulation. If the radio is not oscillating, check connections. If the winding was wound in the wrong direction, reversing the connections to the primary may resolve the issue.

Hope this helps.

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RE: Radio Philco 60B. - sergio - 08-28-2025

OK, perfect, this information is very useful. I'll keep you posted.
Thanks
Sergio.

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