[R-390] R-390/URR Z-503

[bavarianradio at comcast.net]

Hi Tisha, The problem with Z-503 is that the windings  are encased in a powdered iron cacoon and then dipped in varnish. I expect that the coil will need to be soaked in acetone (or solvent of your choice)  to get it apart.  My Z-503 is currently behaving itself but has been intermittent. I "zapped" it with a high voltage arc and got it working, but I'm skeptical as to it's reliability. My intentions were to find a good replacement and then go experimenting with rewinding this one. As you suggested, this can't be brain surgery.  BTW this coil does not exist in the "A" radios. (I already looked at my spare "A" IF deck... rats!) 73's Ross W1EKG
----- "Tisha Hayes" <tisha.hayes at gmail.com> wrote:

It looks simple enough;
Tuned Circuit, Intermediate Frequency: 455 kHz center frequency;
Including
L514 and C563, (13499) drawing no. 278-0235-00.
I have a spare good IF deck, this weekend I will open up Z-503 and
unsolder
a leg of the cap, take measurements of the capacitor and the inductor to
get
some values for what L514 and C563 are.
Ms. Tisha Hayes/ AA4HA