Granted I don't have a ton of experience at this but I have seen it at least 10 times with Heathkit Hw-16's, Hw-101's and my latest project, an SB-102, is no exception. Here's the scenario: I neutralize the finals using the method of removing plate and screen voltage then adjust the neut capacitance for minimum RF pass through. Then I go back and check. Plate dip and output max DO NOT occur at the same point. So what gives? The method leaves me with a dilemma. Do I tune for a Ip dip or max RF? Am I doing something wrong? I've done it using different equipment like and oscilloscope or relative RF indicator. Now I'm blessed with a Motorola R-2001D service monitor which has a spectrum analyzer function. Note: in all cases I've terminated the radio in a 50 ohm load.