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[Penthode]

Curious. What did you do to get excellent B&W tracking? My CTC5 is reasonable except at higher brightness. I attributed CTC5 problem just to an old 21AXP22A.

[dtvmcdonald]

Originally Posted by Penthode

Curious. What did you do to get excellent B&W tracking? My CTC5 is reasonable except at higher brightness. I attributed CTC5 problem just to an old 21AXP22A.

I adjusted the red screen control. That's all it needed. The CRT is good enough that the red remains OK all the way to blooming. I set the contrast a bit below that. At one point on my own color bar pattern which has
not only blue bar matching but red and green bar matching I got all three
almost perfect, but at that point the color frequency response was extremely bad. The alignment must be horrible.

I've never found an old tube set with anything but terrible alignment
except my TRK12 which came to me untouched since worked on by
RCA research in Camden, around 1946. Its alignment was identical to a perfectly aligned CT-100. My Pilot 3 incher and one Hallicrafters
electrostatic set were actually oscillating!

Doug