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I have just pulled my CTC5 apart to try and understand why I cannot get the three guns to track properly. I was going to blame the 21AXP22A but testing it the emission of all three guns is great on the B&K 467. The tracking test show the guns follow so I feel I can declare the tube healthy. (In fact it amazes me how good the CRT is. My guess is the CTC5 was a dog of a chassis - low High Voltage, rather dim phosphors and a pain to adjust tracking and convergence resulting in the set not being used much).
Anyhow I want to find out why the shunt regulator has too easy a life: you disconnect the 6BK4 and the high voltage remains at 21kV! And the tracking problem probably due to my CTC5 incompetence! Even the manual is rather arbitrary when it comes to trying to track with the screen, background and gain adjustments. It is so much easier with the Zenith color set!
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