[Hammarlund] HQ-170 OSCILLATOR STABILITY

[Dave Wood]

This was a common problem and is typical of Hammarlund's of the era.  One
mod we used to do in the 60's was easy and helped lessen the time of the
drift.  If you stuff cotton balls under the 6C4 oscillator tube the drift
time will be shortened.  My 170 used to drift about 9khz on 40 meters from
cold to warm up.  This used to take about 2 hours normally but we reduced it
to about 30 minutes with good ole Johnson cotton balls.  Another trick used
in the A versions was to leave the filaments on all the time on the 6C4.
Cheers Dave

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Today's Topics:

   1. HQ-170 OSCILLATOR STABILITY (Magoo)
   2. FS  SP210LX (gregory mengell)


----------------------------------------------------------------------

Message: 1
Date: Mon, 28 Aug 2006 12:14:01 -0400
From: "Magoo" <magoo at isp.ca>
Subject: [Hammarlund] HQ-170 OSCILLATOR STABILITY
To: <hammarlund at mailman.qth.net>
Message-ID: <006701c6cabd$4113e390$69918bc0 at billscpu>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
	reply-type=original

I just aligned an HQ-170 and found that it took about 4 hours for the 
frequency drift to stop.  This after replacing the 6C4 oscillator and doing 
the VR tube mod.  Any HQ-170 owners have the same experience?  My 75A-4 
settles down to the calibrated settings after about 1/2 hour, and even my 
S-40 and HQ-129X settle out after about 45 minutes to an hour.

Bill, VE3NH 




------------------------------

Message: 2
Date: Thu, 31 Aug 2006 22:18:48 -0700
From: gregory mengell <gregorymengell at comcast.net>
Subject: [Hammarlund] FS  SP210LX
To: hammarlund at mailman.qth.net
Message-ID: <44F7C2B8.7060604 at comcast.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

1942 Issue SP210 with power supply and spare set of tubes. Less Seaker 
and cover. $300.00.Works well. Could use an overhaul after all those 
years.Covers upper VLF  and  MW  as well as HF.  I live near 
Sacramento,California.Will deliver up to 100 miles.Buyer pays for 
shipping . 73 Greg


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End of Hammarlund Digest, Vol 32, Issue 1
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