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I have a 1955 GE which is a 21...something chassis and there is a range control on the front panel which you have to set according to the channel strength...I don't know if this sets the AGC level or if it is just a manual gain control.
Sometimes you can see an improvement in CRT performance if you switch back to the 6.3 crt filament voltage after applying the boosted voltage to shock it back to life....if you return to the 6.3 volts you can prolong the life of the tube. On some sets with weak CRTs I have added a switch to go to the boosted heater voltage when needed...I leave it on the "boost" position for several minutes, and this will rejuvenate it for a while before you have to do it again. This may not work on your CRT if it doesn't really show anything on the normal heater voltage, though.
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