[Boatanchors] Collins 390 zero adjust knob problems.

[Bob Young]

Hi All,
I picked up a nice Collins 390 tonight along with a nice Motorola 390A, On 
the 390 the zero adj. knob wasn't working right or the thing was out of 
range and I was turning it too far, not sure which, it would open the clutch 
when turned clockwise and close again when backed out but I couldn't zero 
beat an 830 KHz AM station with it, when I turned the knob back out after 
zeroing it at 830 it would spring back to about 833 where it was zeroed 
before for some reason, I then noticed that the knob and shaft would come 
right out if I turned it far enough, so I took off the knob and turned the 
shaft all the way in with some vice grips just thinking it was loose, now 
the clutch won't engage, when the knob is screwed in the clutch separates 
even farther but when I turn it back out it doesn't engage, so I think I 
screwed something up, I think I pushed something inside of the shaft(?) too 
far and jammed it. I have loosened the shaft up again and again it will 
screw right out. I have also noticed that the mechanism is different from 
the Motorola 390A which I haven't taken apart yet to see how it works and 
both seems different from my Capehart zero adj mechanism which I think may 
be missing something. Is anyone here familiar enough with the Collins 390 
zero adj mechanism to have any idea what I did? And more importantly how I 
can fix it?

Also both PTO's in both radios are approx 5 Khz off end to end, the 390 has 
a Cosmos and the Motorola has a Motorola (which I've never heard of before), 
are these within adjustment range or do they need surgury? (if they haven'e 
been adjusted before) I'll try to get directions on this later on, my 
immediate concern is the zero adjust, just wanted to know if extensive work 
needed to be done to the PTO's,

Bob Young
Millbury, Ma
KB1OKL