[Heathkit] Heathkit HW-16 and HG-10...chirp

[Kenneth G. Gordon]

On 25 Feb 2005 at 13:59, Tom NØJMY - AAR7FV wrote:

> Jerry, I've never found the HW-16 to be more stable with the HG-10
> than with xtals.  It was usually the other way around for me, but I
> wouldn't rule it out under all circumstances.

Before I made the mod with the added capacitor, I did find the 
chirp to be less with the HG-10...PROVIDED... the HG-10's 
oscillator tube (6CH8) was good. I had to go through 5 or so 
oscillator tubes to get one that wouldn't chirp all by itself (i.e. 
with no HW-16 attached), and some were FAR worse than 
others.

I also use a slightly modified and rebuilt VF-1 with my HW-16 
and it sounds excellent. The same thing held true concerning 
the oscillator tube (6AU6) for the VF-1 also. I had to hand-select 
one that keys with no chirp.

I don't know what the mechanism is inside the tube that 
controls this, but it certainly IS tube specific.

Ken W7EKB