[Hammarlund] mike mcoy shields/list

[Dan Robinson]

Mike:

Your 180 suffered from the same problem that afflicts many of them -- if =

what
you are describing matches my experience.  My original 180C had the same
thing -- when you tune the main, frequency will jump rapidly up or down.
Doesn't happen with the bandspread.  This is a problem that hasn't been=20
discussed
much if at all and it would be interesting to find out how many 180 owner=
s
have had to deal with this.

Mike Taylor wrote:

>Hey Mike...My Hq180 developed a minor problem a couple of years ago. On =
the two upper bands, in the middle of the dial range, slightly adjusting =
the main tuning will cause the oscillator to jump up or down a few hundre=
d hertz. At first I thought it might be a failing tube, but I wasn't able=
 to solve the trouble. So I removed the cover from the main tuning assemb=
ly. I'm not sure, but I think a portion of the drive gear has some play d=
ue to worn teeth on the gear. In seeing how this assembly is put together=
, I decided that replacing the gear wasn't worth the trouble. The bandspr=
ead compensates fine. Anyway, I never replaced the shield and noticed no =
change in performance. I think the shield's main benefit is to keep dust =
and dirt out of the assembly. I have no plans to remove the shield from t=
he bandspread unit. By the way, has anyone ever seen this minor main tuni=
ng "jump"? Still a mystery to me but but not on my immediate "things to d=
eal with" list. Mike, as for discussing Hq180's, yes this is the place fo=
r it. I've learned more about Hammarlund on this site in the last several=
 months than from anywhere else in the last 30 years. Duane Fischer, our =
excellent administrator and who runs the HCI net twice a week, is a Halli=
crafters fan. He's never yelled at me for asking here where I can go to f=
ind Hallicrafters info (At least not yet). As for other products, check o=
ut the Transocianic Fanatic at Yahoo Groups. Heathkit has a great billboa=
rd, as does the Knight-kit page. 73's Mike Taylor
>
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