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In Reply to: RE: That can be seen a couple of ways. posted by Michael Samra on June 07, 2016 at 10:51:40
the 6SN7GTA and GTB were designed for use in vertical deflection amps and horizontal oscillators. The original 6SN7 was designed in the late 1930s, before there was a TV industry. My reprint of the 1940 RCA manual says the 6SN7 was designed for use as a resistance-coupled amplifier and phase inverter. The 6FQ7 and 6CG7 were designed as nine pin miniature substitutes (read: cheaper) for the 6SN7 and were specified for vert deflection amps and horizontal oscillators and apparently worked in B&W TVs but weren't high enough voltage and power for color TVs
Follow Ups:
They did use 6CG7s in color sets..RCA used them for the horizontal oscillator to drive the 6LQ6s in all of their tube color sets from 1960 on right up to the last one which was a CTC39x as I remember.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
My point is that the good old tubes are pretty much gone, especially power tubes, and the new production keeps improving.
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