[Hammarlund] Unstable Oscillator adjustments in the HQ-180

[K3PID]

OK, as far as I can determine the slugs and caps are in good shape. The 
touchy issue means that when I put the adjusting tool on the screw and just 
tweek it a little the output jumps.  On all of the IF transformers, I can 
turn the adjustment slowly and see the output drop or increase relatively 
slowly so that I can sweep through the peak and back up to find it then 
remove the tool and have it stay put.  with the oscillator transformers even 
a slight turn causes a sharp change in output and it is almost impossible to 
stop on a peak. Sometimes just removing the tool shifts the output peak... 
The "problem" exist on all of the HF Osc transformers so it is something 
common to all band switch positions. All the tube socket voltages and 
resistances are nominal ( ±10% maybe ). I have the set working fairly well 
but can't help but think that it could be better...  I've been using it for 
the Classic Exchange so after Tuesday I will put it back on the bench and 
continue trouble shooting.... I was hoping someone had experienced the 
symptom before and could report their findings...

TNX  es 73
Ron K3PID



-----Original Message----- 
From: manualman at juno.com
Sent: Sunday, January 31, 2016 7:57 PM
To: hammarlund at mailman.qth.net
Subject: Re: [Hammarlund] Unstable Oscillator adjustments in the HQ-180

Do you perceive that the slugs are loose or exactly what does "touchy"
mean?

Pete, wa2cwa

On Sun, 31 Jan 2016 18:45:08 -0600 "K3PID" <Ron.K3PID at sbcglobal.net>
writes:
> It's not a drift problem! The VFO is rock stable after a short
> warm-up. I
> made the addition of the separate filament supply for V2 & V18. The
> problem
> ( or perceived problem ) is touchy transformer adjustments! I
> watched Pete,
> K7PP adjust the transformers on his YouTube video and they did not
> appear
> touchy at all.
>
>
> -----Original Message----- 
> From: manualman at juno.com
> Sent: Saturday, January 30, 2016 4:27 PM
> To: hammarlund at mailman.qth.net
> Subject: Re: [Hammarlund] Unstable Oscillator adjustments in the
> HQ-180
>
> Try a different 6C4. 6C4's can be very flaky at times.
>
> Pete, wa2cwa
>
>
>
> On Sat, 30 Jan 2016 15:19:30 -0700 RAY FRIESS <rayfrijr at msn.com>
> writes:
> > The old tube rigs, while great radios, were susceptible to drift
> and
> > stability problems, mostly for a while after first being turned
> on.
> > That's why we would often turn them on (or in the case of the
> > Hammarlund rigs, set the clock timer to turn on the rig) for about
> > 30 to 60 minutes before we were ready to do some serious
> operating.
> > This would allow them to become as stable as they could, and would
> > cut down the amount of drift substantially.   I would recommend
> > doing the same thing before you make adjustments and
> > aligning.   It might help.
> >
> >
> > > From: Ron.K3PID at sbcglobal.net
> > > To: Hammarlund at mailman.qth.net;
> > Hammarlund_moderated at yahoogroups.com
> > > Date: Sat, 30 Jan 2016 16:12:21 -0600
> > > Subject: [Hammarlund] Unstable Oscillator adjustments in the
> > HQ-180
> > >
> > > I�ve been working on my HQ-180 and have had some success but I
> > have discovered that while all  the adjustments in the ANT and RF
> > section are nice and stable easily adjusted for peak, the
> > transformer adjustments in the HF OSC section ( T23 thru T27 ) are
> > very touchy and might even be called unstable.  Has anyone else
> ever
> > encountered this? Any speculation on possible causes?
> > >
> > > Regards
> > > Ron K3PID
> > >
> > >
> > >
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