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I checked the KCS72A data for the 21T207. The chassis layout looks similar to the KCS66A. However the ttubecompliment is somewhat different. Also the KCS72A has three video IF tubes and the KCS66A has four. The other noticeable difference is the KCS72A has two tube rectifiers (5U4 and 5Y3) in place of the selenium rectifiers.
Tube compliment of KCS72A 21":
6CB6 RF amp
6J6 Osc Mixer
6CB6 three stages of VIF
12AU7 2nd detector Vert Sync amp
6AG7 video amp
6AU6 two stages SIF
6AL5 ratio detect
6AV6 first audio
6K6 audi out
6AU6 AGC
6SN7 horiz sync
6J5 vert osc
6K6 vert out
6SN7 horiz osc
6BQ6 horiz out
6W4 damper
1B3 HV rect
21AP4 pict tube
5U4 and 5Y3 rectifiers
Does this match?
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