My Christmas day 9T246 restoration! Almost.....

[earlyfilm]

Originally Posted by Kamakiri

"HORIZONTAL LINEARITY". Well son of a gun!

Powered up the set, and went to adjust it when I realized that the adjusting screw that would be IN the pot, is missing!

Kamakiri,

Lets determine what happened. The Horizontal Linearity in this set is a coil and not a pot. I assume that your typing got a little ahead of your thinking.


On the apparently missing slug in horizontal linearity coil, find another slug from a junk chassis about the diameter as the hole in the present coil and try it. It probably won't be correct, but it will be a lot closer than no slug. After finding a slug and adjusting it for more or less correct horizontal linearity, repeat the horizontal alignment instructions in the sequence that RCA and Sams gives them.

http://www.earlytelevision.org/pdf/R...-Sams-74-8.pdf

Sams page is 18, the PDF page is 21 for the alignment instructions.

Make a paper print of the page and check off each as you do it.

You will notice that Horizontal Linearity adjustment is in the 8th line of those instructions.

Misadjustemnts here could cause the shrinking that you mentioned in your next post, and so could an incorrect horiz drive setting, or a cathode resistor heating.

Consider finding a 1950's or early 60's era scope. They are not expensive. After a simple recapping, they will be as good as new. Be sure to pick one where the schematic and service instructions are available. The newer scopes are more expensive and they are not as rugged when used around tube era voltages. After you have a scope working, see how far you are out on the "peaks" that you assumed were perfect.

James.