{Collins} Tube compatibility.

I am looking at purchasing a pair of 4X250B tubes for a KWS-1 transmitter
(So I can have spares) and I was wondering if anyone has had any luck with
substituting a 4CX250B, 7203, or 4X150A?  I have seen varied reports of
compatibility on line, but wanted to get some general feedback before
trying anything.


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