[Heathkit] DX-35 Grid Drive

[Mike Hyder -N4NT-]

Had a plate shunt resistor go open in a DX-40.  Think it was 0.67Ω but that 
has been a long, long time ago and I've slept since then.  The meter would 
pin with a bang.

73, Mike N4NT

----- Original Message ----- 
From: "Bill Stewart" <cwopr at embarqmail.com>
To: "Gene" <erastber at tampabay.rr.com>
Cc: "heathkit" <heathkit at mailman.qth.net>
Sent: Monday, November 29, 2010 6:55 PM
Subject: Re: [Heathkit] DX-35 Grid Drive


> Hello Gene,
> I think I'd take somewhat low drive to high (in my case a min of around 
> 3.5 ma).
>
> So far I have changed the buffer scr. dropping resistor from 27K to 
> slightly above 50K. The drive dropped down to between 2.5 and 3ma (min. 
> adjusted). Note sounded good. BUT, something else has now happened (my 
> luck). Now it won't dip and the plate cur. pins the meter plus heard some 
> arcing. I'm now in the process of trying to find that problem..and trying 
> to be careful and not zap the glass pwr. xfmr. Ain't this stuff fun??? Mo 
> later.
>
> Thanks to all for your comments.
>
> 73, Bill K4JYS
>
> ----- Original Message -----
> From: "Gene" <erastber at tampabay.rr.com>
> To: "Bill Stewart" <cwopr at embarqmail.com>
> Cc: "heathkit" <heathkit at mailman.qth.net>
> Sent: Monday, November 29, 2010 3:14:25 PM
> Subject: Re: [Heathkit] DX-35 Grid Drive
>
> Bill:
>
> Very interesting that you have too much drive -  I have a '35 that I
> rebuilt some time ago and I have the opposite problem: very low drive.
> So, could you send me some of your extra drie????
>
> Gene, W0QFC
>
>
>
>
> On Sun, 2010-11-28 at 09:05 -0500, Bill Stewart wrote:
>>
>> During the last few days I fired up a DX-35 from the fix-it shelf and it 
>> worked ok from the start. However, I did find a few loose solder joints 
>> so went over it with the iron. I added a fuse and pulled the modulator 
>> tubes to reduce the load on the pwr xfmr. So far the only problem I see 
>> is too high grid drive on 80/40 mtrs. The min. I can get is around 3.5ma. 
>> and w/o much adjustment. Twenty mtr grid drive is adjustable from 1.5 to 
>> 5 ma. Any idea how I can reduce the grid drive on 80/40? It should be 
>> around 2.5ma. for the good health of the 6146.
>>
>> Thanks...73 de Bill K4JYS