[AMRadio] COLLINS KWS 1 power supply questions


David Knepper collinsradio at comcast.net
Tue Nov 3 09:29:13 EST 2009


Solid state plug ins are not recommended.  The higher voltage will put a
strain on the input choke.

Use 3B28 tubes instead.


   
David Knepper, W3ST-W3CRA
Publisher of the Collins Journal and 
Secretary to the 
Collins Radio Association
www.collinsra.com
 
-------Original Message-------
 
From: Jim Wilhite
Date: 11/2/2009 9:17:26 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] COLLINS KWS 1 power supply questions
 
Greg if you replace tube rectifiers with SS plug in units, do remove the
filament line and take the output from pin 4 in the case of 866s.  Other
wise you might ruin a transformer someday and you really don't want
that.  I don't know about the KWS 1, but if the voltage is taken from
the centertap, it would not be good.
 
Jim/W5JO
 
 
----- Original Message -----
 
 
 
> Hi:
> I finished rebuilding the power supply on my new KWS 1.  I have a
> couple of questions for the group:
>
> Is there a substitute for the HV fuse in the 2 kvdc line? Is the
> original still being manufactured?
>
> I'm going to use solid state plug in diodes instead of the 866A's.  Do
> I need to disconnect the filament supply to the 866A sockets?
>
> Thanks
> Greg
> WA7LYO
> Kinston NC
> ______________________________________________________________
 
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