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Perhaps WB IQ didn't work so well after the CTC2/B was due to the fact the later CTV had fewer IF stages than the original six! When they got down to three stages they couldn't get the flat response and precise uniform phase delay required for WB IQ without artifacts, so they stuck with NB R-Y B-Y? Rediscovering WB IQ really fascinates me and others. Sort of cultish,eh?......Tom
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I checked all the RCAs from CTC4 to CTC20. the CTC4 had a tuner IF plus three chassis IF amps. the CTC5 had same 4 IFs. The CTC7 had no tuner IF and 3 chassis IF, 3 total. All the rest to CTC20 remained at 3 total IF amps verses 6 IF amps of the CTC2/Bs!. No wonder WB IQ was wasted on these last tube CTVs.......Tom