[Hammarlund] HQ-170A drift

[Al Parker]

Hi JOhn,
	The 6C4 advice is good, could be most of your trouble.  But, you have a 
170A.  Does much of the drift go away after 30-45 min. of being turned 
on?  Do you have it plugged into a "power strip"?  Many folks do that to 
preserve the life of the on-off switch, but the -A models do keep the 
filaments on at all times for the 6C4 osc. and the mixer tubes.  That 
keeps the tubes warm all the time and the extra heat helps keep the rest 
of the ckts a bit above room temp.
	I had an HQ-180A which developed drift, and I realized that I had 
recently plugged it into the power strip that I used to turn off the 
desk light and soldering iron.
73,

Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 5/16/2014 6:28 PM, John Boyle wrote:
> I recently bought an HQ-170A at a hamfest.  It’s in good condition but has the well-known frequency drift in spades.  I’ve read comments about the instability of both the capacitors and inductors in the oscillator section.  Would some new high-quality capacitors help and if so, which ones?  Any thoughts on this matter would be appreciated.
>
> John  VE3PMA
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