[Hammarlund] Unstable Oscillator adjustments in the HQ-180

[K3PID]

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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