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Any updates?

Just looking at the info for the change 2 manual for the GRM-55 and they are now saying to alternately push and release the test button as you adjust the cal knob rather than holding the button down. So possibly holding the test button down steady is the problem. Give it a try and let us know...

Since the GRM-55 wasn't designed to be used with the 77 that may be your problem. There are enough internal differences between the radios that a test that works on a 25 may not work on a 77.

You know after 40 years or so cold solder joints and bad contacts and connections can play havoc with these radios. Half the time just running the tuning knobs around wipes the contacts clean and they start working again. If you can find a can of "tuner lube" or "contact cleaner" you might...

Mouser, Digikey, Allied, Newark, Jameco, 1000bulbs, almost every surplus electronic store in the country................

The pots do fail occasionally and aren't too hard to replace. Symptoms include low audio, wobbley shafts, and endless turning. The PRC-25/77 radios have never been known for great audio and unfortunately their A25 and A55 modules don't interchange. This is the audio amp module located on the...

Well I tell you F18hornet, they aren't getting any lighter! I have a couple Sincgars sets and a PRC-117 and they weight in about the same. Lucky there's a seemingly unending supply of Grunts willing to hump these things around! Now they real new stuff like the PRC-148 MBITR and the PRC-152s are...

module swapping Going back over your post you may have an issue in the antenna match unit located just inside the front panel. This is the aqua blue thingy behind where the antenna mounts. Look for a thin coax cable and see if it hasn't broken off the terminal it attaches to. It might be...

PRM-34s Mike, About 20 years ago Cincinatti Electronics shut down the production line they had building PRM-34s in Mexico. I bought 8 palletts of PRM-34 stuff from them including about 50 finished units in their field cases. I still have my original 34 and 2 others in their field cases ready...