[Heathkit] DX-40 question

[Bill Cromwell]

Hi,

He did say it will take off without even having an xtal in the socket. 
That seems like feedback from the final to it's own input or to the 
prior stage. And what about the screen bypass?

73,

Bill  KU8H

On 09/25/2016 11:45 AM, Buck via Heathkit wrote:
> Jack,
>
> Not familiar with issue, but I assume you've tried a couple xtals?
>
>
>
>
>
> On Sunday, September 25, 2016 Jack Antonio <scr287 at att.net> wrote:
> I'm working on the same DX-40 I've had since my Novice
> days 50 some years ago.
>
> Cleaning, tightening screws, checking solder joints
> new 6146, tune up.
>
> And the end result is a transmitter that works good
> with one exception.
>
> It is a little squirrely on 40 meters, with 40 meter
> crystals. The "band-aid" is to back the oscillator coil all the
> way out, and keep grid drive below 2mA.
>
> By squirrely, I mean that it has a tendency to take off
> on its own without a crystal in the socket, jumpy tuning,
> sluggish crystal activity that depends on both tuning and
> the position of the meter switch. Again, this is only
> on 40, with 40 meter crystals. All other bands work just fine.
>
> The question is, wasn't this documented somewhere? I seem
> to recall this, but a search of the ARRL QST archive, and
> a quick look through my 73 magazines, didn't reveal anything.
>
> Just wondering if anyone else has heard of this, or know of
> any writeups about it.
>
> Thing is, I don't remember this issue from 50 years ago, but
> then also, I never had good luck with this transmitter on 40.
> Always had good results on 80 and 15 though.
>
> Thanks
>
> Jack Antonio WA7DIA/4
>
>
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bark less - wag more