Philco FM tuning 47-1227 - Printable Version
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Philco FM tuning 47-1227 - keith49vj3 - 11-12-2010
All, After nearly a year of tinkering I've finally got my first radio restoration finished. The Philco 47-1227 had under gone a complete meltdown 35 years ago. The chassis looked like it had been hit with a blow torch. I found a used power transformer and recapped and re-wired the unit. When I fired it up I was surprised to find that it worked. However, I've got a weird FM tuning problem. The AM works great and when I sweep the dial from left to right I can pick up all the available stations, when I sweep the dial from right to left I also pick up all the stations. The FM is a different story, I can pick up all the stations when I sweep the dial from left to the right, but when I go from right to left the radio goes completely silent. Once I go to the left and change directions everything works again. Iâll pull it out of the cabinet tomorrow to see if I can find the problem. Any suggestions on where to look? As I mentioned earlier this is my first radio I've worked on.
Thanks in advance.
Keith
Re: Philco FM tuning 47-1227 - Radioroslyn - 11-13-2010
Check the tuning condenser for looseness. Maybe the terminals are shorting to the chassis at the low end of the dial. Or perhaps a bad connection.
Seems like a you have a mechanical problem rather than an electronic one.
Terry
Re: Philco FM tuning 47-1227 - keith49vj3 - 11-13-2010
I'm confused. Does the FM use the same tuning capacitor as the AM. And if yes, shouldn't I have this problem on AM as well? Can I use some sort of cleaner on movable plates?
Thanks,
Keith
Re: Philco FM tuning 47-1227 - codefox1 - 11-13-2010
There are separate tuning gangs for FM. They have fewer plates, and these you can check for shorts by sliding a piece of paper between the rotors and stators. If it rubs, you know which one needs to be bent back .