Believe the last number only indicates cabinet. X19 is wood. Some others are Catalin, X15 & X16.
Here is another schematic listing different 51X numbers:
http://techpreservation.dyndns.org/schematics/42/42_Motorola_51X16_76.djvu
Norm
:Youd think this would be right here amongst all the other motorola stuff... but I can't find any info on it anywhere... though I've seen pix of it elsewhere in old radio galleries on line.
:I haven't examned it very closley yet.. but it seems upon first glance to be a standard AA5 set up...
:Do you think it's going to be almost the same as the other 51x radios perhaps just like a 51x16 which I CAN find here?
:maybe?
: