Motorola 77XM AM/FM Radio found today

[wa2ise]

Originally Posted by jr_tech

schematic on page 1 & 2

https://www.tubesandmore.com/schematics/motorola/hs-102

hs-102 is the chassis number for the 77xm.

First time I've seen a radio make use of the AM pentagrid converter 12BE6 tube as an FM IF stage. I figured that that would be possible, and sensible, to put that tube to work when the radio is in FM mode. Don't know why this wasn't done more often. You'd need a switch contact that disables the AM local oscillator. Just short the cathode portion of the osc coil.