[Hammarlund] HQ-110 issues.

[Kenneth G. Gordon]

On 16 May 2009 at 2:24, Roy Morgan wrote:

> 
> On May 16, 2009, at 1:58 AM, Kenneth G. Gordon wrote:
> 
> > ... the two discs of the pinch-drive
> > have separated or "spread" apart
> 
> Ken, I can't say if any of the things you report are common, but here 
> are a couple of suggestions:
> 
> Seems that something has slipped or let loose.  There may be a  pin or
>  crimp or something that holds the two disks onto the knob shaft. 
> Have  a closer look.  It may mean taking the shaft out for repair.

Well, I found the problem, but it seem rather odd to me: the 
nut on the flywheel was loose. Apparently, that is what 
tightens up the pinch drive...which, as I said, seems odd to 
me. I would think that the pinch drive should be "riveted" 
together instead of held together by all sorts of stuff in 
between.
 
> > f... terrible microphonics at
> > the moment, which seem to be centered around the 6AZ8
> 
> The first thing I'd try is another tube.

Don't have one right now, but am getting some.

>  However, some ceramic caps, 
> or even micas, can become microphonic.  If it's not the tube, tap and 
> rub things under there with a pencil or chop stick.  It might even be 
> a ground connection like the mounting of a socket ring used for 
> grounding.

Well, at this point, I am almost certain it is the tube. As 
soon as I get another one to replace this one with, I'll do 
some more investigating.

I also found a wire within the lacing, white with a green 
stripe, that is disconnected at both ends. That is also kinda 
odd to me.

Lastly, I am now hearing a bunch of random noise. Sounds 
like a leaky capacitor somewhere to me.

The receiver seems to be quite sensitive and even 
relatively stable after it warms up a bit.

Thanks, Roy.

Ken W7EKB