Fwd: [Drake] T-4X mystery knob

[Darryl Trump]

  A couple of our wonderful group has informed me that I have discovered 
the VOX "hang time" adjustment.  Thanks guys.  I maybe should have 
figured that out, but I nice to have confirmation too.  Cheers!

Thanks again,

Darryl Trump, KB8BKU

Begin forwarded message:

> From: Darryl Trump <kb8bku at woh.rr.com>
> Date: Sat Jan 19, 2008  11:22:04 PM US/Eastern
> To: Drake at mailman.qth.net
> Cc:
> Subject: [Drake] T-4X mystery knob
>
>
> I am in the process of getting my first pair of "twins" on line.  The 
> R-4A is alive now, and many thanks again to the group for your help 
> with the bad oscillator transistor.  I'm working to get the T-4X 
> purring.  I may have trouble with the T/R relay circuit.  It doesn't 
> sound like it clicks very positively when I switch to TUNE.  I have 
> found an unlabeled control pot on the rear of the chassis, right 
> behind the Carrier Balance control, and beside the KEY jack at the 
> rear corner.  It is a 15 Meg pot serving as  a variable resistor.  It 
> seems to be connected to the grid circuit of the T/R relay driver 
> tube.  In fact it may be replacing R95, a 3.3 meg fixed resistor in my 
> schematic.  This appears to be a factory change that isn't covered in 
> my manual.  The chassis photos in my manual don't show anything where 
> this pot is.  Can anyone tell me what  this control is, how is it 
> used, and what is the proper method for adjustment?
>
> Thanks in advance,
>
> KB8BKU, Darryl
>
> ______________________________________________________________
> Drake mailing list
> Home: http://mailman.qth.net/mailman/listinfo/drake
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Drake at mailman.qth.net
>