[Heath] HW-101 VFO

[Bill Cromwell]

Hi Ken,

Yu probably already tried a different VFO tube but I overlooked the part 
where you mentioned it. At end of life they can just 'run out of gas' 
after a few minutes. There was something like that in - I think- the 
Johnson Ranger.

73,

Bill  KU8H

former novice

On 03/04/2018 09:41 PM, Kenneth G. Gordon wrote:
> I thought I would check here to see if anyone beside myself had run into
> this problem: I am working on a friend's HW-101 which he recently bought
> at a garage sale for $50.00 with an HP-23 and a Heathkit speaker.
>
> The HW-101 was extremely dirty, not having been used for some time, but
> cleaned up well, and was apparently very well-built.
>
> The problem is that after the rig has been on for a bit, the VFO quits.
> Completely.
>
> I hooked my Tek 2467B scope to the output coax and although when cold,
> the output is good and is a pure-looking sine wave, within about 15
> minutes at the longest, the output amplitude begin to fall, then
> suddenly completely disappears.
>
> I have a "spare" HW-101 VFO here which I "clip-leaded" into place, and
> with that one in operation, the rig works exactly as it should. It even
> appears to be properly aligned.
>
> So...has anyone else here experienced such an issue with an HW-101 VFO,
> and if so, what did you discover?
>
> I'm going to remove the bad VFO sometime next week.
>
> I suspect I will find a bad solder joint in it somewhere, but I am also
> suspicious of a bad component. But which one?
>
> Also, are replacement Jackson ball-drives still available? These are a
> bit rough.
>
> Ken W7EKB
>
>
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