[Hammarlund] New to Hammarlunds

[Kenneth G. Gordon]

On 9 Apr 2011 at 8:21, Glen Zook wrote:

> Welcome to Hammarlund receivers.  Although some people will disagree,
> the Hammarlunds are notorious for drifting,

Yes. I had a BC-779 many years ago that drifted back and forth on 20. The 
drift wasn't too bad, and in fact, it was sort of pleasant to hear it.

> especially on the 20-meter
> band and higher frequencies.  The series that started with the
> HQ-120X, then HQ-129X, then HQ-140X, and finally the HQ-150 are
> generally very stable after about a 30 minute warm up.  Unfortunately,
> the HQ-100, HQ-110 series, HQ-160, HQ-170 series, and HQ-80 series are
> all known to drift.

Again, yes. That 6C4 oscillator is very problematic. However, there is a sort-
of fix for the tube issues, at least.

Replace the 6C4 with a 6J6 with both sections wired in parallel. This can 
help in some cases.

My HQ-110C drifts like crazy now, although it didn't previously. I haven't dug 
into it, but suspect the 6C4 in it.

Ken W7EKB