The AM Forum

At a flea market today I scored a clean 7-9.1 Mc ARC-5 receiver for $12 with all the tubes and dynamotor, missing only the bottom plate. Unfortunately sometime between now and Aug. 1943 "Hammy Hambone" had sloppily rewired the filaments for 12 volts, so I had to fix that first. Also regreased the dynamotor bearings and freed a stuck brush. Now it receives (three stations at once)  ;D

He also had this interesting looking WWII-era chassis. I can't figure out what it may have come from, but it's some kind of subassembly. No identifying plate on it. It also has its own dynamotor. Does anyone know what it is? Or want it, I can get it cheap?

thanks
Charles

The dynamotor model number might narrow it down.

Doesn't look military,  probably a piece of old mobile two way radio stuff,  junk don't pay anything for it.  Doesn't look like it's from a Gonset,  but most likely part of a mobile receiver due to its very compact design.

Fred

I'll take a closer look and see if I can find any numbers on it (dynamotor plate is pretty faded/worn too).
Underneath it is coated with MFP (and has the stamp confirming it). Would that still be commercial and not military?

Can't be WWII era,  those tubes were not in use at that time.

If it's military, it's no newer than the Korean War just based on the tubes.  Looks like it might be the receiver part of an early FM mobile.  If so, should have a multiple contact plug or socket on it for the interconnecting cabling.  Not Motorola; at least not any I have seen.  Wondering if the circular items at the top of the picture are part of a preselector filter similar to what Motorola used in their Business Dispatcher.  Don't remember what they called it.  Don't know why it would have MFP coating if not a military rig, but some contracts for some parts of the world called for it in some commercial rigs.

Still wondering what this thing is... took another look the other day. No identifying marks I can see at all, except on the dynamotor plate which is definitely 28V in, and 250V, 60 mA out. The plate is badly worn, and I can barely make out the ratings and Westinghouse brand, but it does not have a "DM-" or "DY-" model number.
 
It does have a couple of large Jones-type plugs for interconnects.

Looking at the "front" it has several air trimmer caps with dials marked with letters as you can see.

What about the little transformers on the end. Are they saturable reactors or some kind of servo transformer? Could this be navigation equipment?