VCO Block Needed, Uniden UPD857 Chassis

[DTB Radio]

I know this is an INCREDIBLY looooong shot, but I need a working VCO block for a Standard Communications model Horizon 29 CB (its the CB that was used in the truck from The Fall Guy TV series). It uses Uniden's PC-130AA PLL module which is a UPD857-based unit. The VCO is a wax-potted metal-enclosed board with seven interface pins that solder into the PC-130AA board. I've attached a picture of the PLL unit I'm servicing. All trouble-shooting points back to the VCO block. If anyone has one of these blocks, or know who does and might be willing to sell, please shoot me an email (see www.dtbradio.com for my email address). Thanks in advance for any info anyone can provide!

 

[DTB Radio]

Just realized that's not wax, its some kind of epoxy or similar resin. So much for the option of melting all the wax out of it, lol...

 

[sunbulls]

This is the schematic I scanned from the manual that came with my Horizon 29 (23 ch version). Maybe this will help...

 

[TM86]

From Sam's CB 94. I managed to get the pages out of order but I think you can figure out where things should go.

 

[DTB Radio]

Thank you very much for your reply! I'm hoping to avoid a scratch-built scenario, but I have the schematic from Sams 94 so it is doable if needed. If it DOES come to having to scratch-build one, I may go for something that uses a basic NPN transistor instead of a JFET.