modification

I need to know; 1. If either TP4 or IC4 pin9 should be used for discriminator tap or a different one. 2. How many resistors and size uF and volt. 3. Is a capacitor necessary? Size? Doesn't seem to be much info on this model for mods. I'm posting a pic showing what I think the...

When you unscrew and remove the metal hanger button on the back of the radio a small, black, plastic spacer plate comes off too. Looks like interface was designed as a mount point for interchanging other types of clips or mounting hardware. Does anyone know if there is a flat, blank cover plate...

Well, after using the my new PSR-500 for about 1 1/2 weeks, I quickly came to the conclusion that the belt clip is definitely inferior and certainly the worst part of this otherwise great radio. I dug around in the parts bin at the house and found a new Motorola HT1250 clip. It has a similar...