[Collins] KWS-1 genealogy

[Gayle Lawson]

Off the top of my head I think that the factory started installing  250s
around SN 1000 or 1100.  I think that Care and Feeding of the KWS-1
article will tell you for sure.  I have worked on serial numbers in the 
700 and 800 range, they still had 4X150s silk screened on the PA cover
although one radio had a very flat pair of 250s in it.

I have SN-412 , it hs 4X150s however I also have SN-12 that has been
back to the factory for full update, it has 4x250s.  Do you have a 6X4
or 6AL5 ALC tube?  ALC pot on the front panel or the tune key?  Your
radio may have been updated at the factory also, hence the 250
designation on the 
PA cover.

 The internal capacity of the 250 tube is different than the 150 which
caused a design change in the grid circuit. 

Hope this helps 

Gayle 

Cliff Bond wrote:
> 
> I am looking at a KWS-1, s/n 451.  The cover on the tubes in the final amp.
> RF deck labels the tubes as 4X250's; however, the transmitter actually has
> 4CX150's in it.  I did not know until I saw this one that some KWS-1's used
> 4X150's.  I have not been able to find any information on this other than a
> passing-reference to the fact that some used the 4X150's.
> 
> I would appreciate any "education" on this issue anyone may be able to
> offer.
> 
> Thanks,
> 
> Cliff
> 
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