[Heath] DX-60A Grid Tune Issue

[Robert Wood]

Well, another ham informed me that the L1 adjustment instructions are on in
the DX-60B manual page 36 paragraphs 1 and 2 left side of page.  Sure enough
it is also in the DX-60A manual.  I am not sure how I missed it, but maybe
it's time for my set of 'bionic" eyes ;^)  Thanks again, Bob K5MBA

  _____  

From: Robert Wood [mailto:radiorob at swbell.net] 
Sent: Saturday, April 08, 2017 7:25 PM
To: 'Glen Zook'; 'Kenneth G. Gordon'
Cc: 'Heath at puck.nether.net'
Subject: RE: [Heath] DX-60A Grid Tune Issue


Thank you so much everyone, 
 
Another Heathkit responder recommended I adjust the L1 coil to approximately
3/8 inch from the top of the coil.  I did that first and boom, I was able to
get more than enough grid mA on all bands.  
 
I am surprised the individual who sold me this rig said he it was working
after he replaced all of the electrolytic capacitors and 10 out of spec
resistors.  Not sure how it could work because the L1 coils was about 3/4
inch above the top of the coil.  
 
I went ahead and attached the scope as recommended and it also peaked around
3/8 inch from the top of the coil.  I wonder why Heathkit never discussed
this adjustment in the manual?  In any case, I am a happy CW operator now.
 
Thank you so much for everyone's advise and input.  Hopefully I can return
the favor someday!
 
73's
 
Bob K5MBA
 
 
  _____  

From: Glen Zook [mailto:gzook at yahoo.com] 
Sent: Saturday, April 08, 2017 11:11 AM
To: Kenneth G. Gordon; Robert Wood
Cc: Heath at puck.nether.net
Subject: Re: [Heath] DX-60A Grid Tune Issue


I am 73-years old.  However, with "bionic" eyes (plastic lenses being
installed with cataract surgery) I was able to see the "."!  :>)




 
Glen, K9STH 

Website: http://k9sth.net


  _____  

From: Kenneth G. Gordon <kgordon2006 at frontier.com>
To: Robert Wood <radiorob at swbell.net>; Glen Zook <gzook at yahoo.com> 
Cc: "Heath at puck.nether.net" <Heath at puck.nether.net>
Sent: Saturday, April 8, 2017 10:36 AM
Subject: Re: [Heath] DX-60A Grid Tune Issue



On 8 Apr 2017 at 14:18, Glen Zook wrote:

> You need to read his original message again!  He said 0.5 mA, not 5 mA.

Ah! Thank you, Glen. I missed that And that is why when I wish to e-mail
such info, I always
write it as "0.5" not simply ".5" as an example.

In which case, he can completely dismiss anything I told him, except how to
peak L-1.

>  I have found that most of the 6146 family of tubes will put out full
> power at around 1.75 mA but not below.

Same here.

>  Between 2 mA and 2.5 mA grid current per tube is a good target.
>  Anything above 3 mA will definitely shorten the life of the tube.

Yes. That is my experience too. 


> The "." before the 5 is very easy to miss!


Well, I missed it. After all, I am within only a few days of my 75th
birthday, and my eyesight is
getting worse.


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