[Hammarlund] HQ-170A drift

[Kenneth G. Gordon]

On 16 May 2014 at 18:28, 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.

My thoughts:

Since the HFO is a 6C4, I would buy some of the military versions of those off 
eBay and substitute tubes until I get one that is stable.

Ken