Quote:
Originally Posted by Yamamaya42
Mind boggled...
To me it seems that adding that gimmick just gives a faster way to wear out the green/blue guns, having a master CRT bias pot on the back tied to the cathodes of the Y-AMPS, and another on the front, on the CRT green/blue G1 that the user can set?
This is prob why it was replaced with a new one in 1973.
No telling what condition it's in now, won't know till I pick it up on Saturday. 
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It may have been the pot equivalent of the sepia switch om my old airline console. The idea was that on B&W films and TV shows older viewers that watched film before TV existed may prefer the look of sepia monochrome film stock and wish for a way that their TV could duplicate it...It looks stupid on color shows but I can see why some people might like it on monochrome shows.