Timmy,
I have a 3 switch (R G B) color gun killer I believe also acts as a brightener. It was manufactured by Perma-Power, Chicago, Ill. And is model # T-101. VKer's please correct me if this is not a brightener but just a color gun killer. This unit has the correct 70 degree female crt socket.
Just found this NOS color brightener currently available on ebay:
http://www.ebay.com/itm/RMS-COLOR-CR...item232a17fb56
-Steve D.