[Hammarlund] HQ-110 stability

[Greg Mijal]

The HQ 110 is reasonably stable for what it is.
I consider it the best bang for the buck for the round shouldered 
Hammarlunds.  They will drift over time but sudden changes in frequency is 
suspicious.  Suggest you do a quck check of the oscillator voltage line, 
then do a complete cleaning of the tuning capacitor bearings and shaft 
wipers, including the bfo.  Also, you can re-seat all the tubes and de-ox 
the sockets.  This problem sounds like a mechanical situation, not an 
electrical.  FYI: a nice HQ 110 sold at my Radio Club's Saturday auction and 
I'm happy to report the 110 is holding it's value.  If I had my choice of a 
HQ 100 or a HQ 110 I would go with the 110.  Reason being is that there is 
no bfo circuit in the 100!  You have to push the Q multiplier into 
oscillation to receive CW.
73's
Greg
WA7LYO
Kinston NC
----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at verizon.net>
To: <Hammarlund at mailman.qth.net>
Sent: Sunday, February 07, 2010 10:32 PM
Subject: [Hammarlund] HQ-110 stability


>I used my HQ-110C in the last CX and noticed very quickly
> that it was very unstable.
>
> Every time some appliance in the house turned on or off,
> the HQ-110 would change frequency very noticeably.
>
> I checked the 0B2 regulator tube, and it appears to be
> working properly. And I changed the 6C4 HF oscillator, with
> no noticeable effect.
>
> I have some Hammarlund notes from BAMA that mention
> that the 6BE6 could cause drift, but my problem sounds
> more like dynamic instability rather than simple drift.
>
> I would like to hear from others who own and use this
> receiver as to whether or not their receivers have as bad
> instablility as mine.
>
> Any ideas from anyone towards a solution cheerfully
> accepted.
>
> Ken Gordon W7EKB
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