That would be a return to 24 kV. The 19VP22 was most commonly used with an ultor voltage of 25 kV. The 21-CT-55 and CTC-4 ran the 21AXP22 at 25 kV.
The CTC-5 attempted to run the 21AXP22 at atound 20 kV, which would have worked if they had been able to get 20 kV out of the CTC-5 flyback at adequate current.
Motorola used an ultor voltage of 20 kV or so with the 21AXP22 in the 21CT2. It worked fine.
The CTC-7 is specified at 23.5 kV; I think the CTC-9 is similar, both sets using the 21CYP22.
I think the "New 24000 volt chassis" ad copy is just that: adman B.S.
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