Happy Labor Day on CTC-5

[Penthode]

No question of keeping it working. It is only technical minds always are curious about these things. My CTC5 is very watchable and I enjoy using it a couple of times a week for a couple of hours each time.

My CTC5 has a similar purity issue and is using it's original CRT (date code 56-30 or July 23 to 29, 1956).

Just rotating the tv cabinent in a room 90 degrees means checking purity. It appears best to me to first retract the edge purity magnets, degauss and then readjust the purity magnets, to do a thorough job. As I only have a minor impurity on the top let of the screen, I may simply just tweak the magnet to touch up the corner impurity.

The scan linearity on my CTC5 is now surprisingly good and remains consistent as the set warms. I found a number of the carbon comp resistors in the vertical sweep circuit drift with temperature. And I had to carefully select the metal film capacitors I used to replace the paper dielectric units to maintain good vertical linearity as the set warmed. I have noticed sets not using a vertical blocking transformer and instead just use feedback from the output transformer especially prone to linearity drift with temperature.