Great info. Thanks.
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I agree with your last sentiment; I cannot imagine how the BAT could be actually affecting crosstalk between channels. It may be that there is a slight difference in gain between the two channels in the BAT, due to naturally occurring variations between one tube and another, and that this is somehow affecting the way the Foz reads crosstalk. Also, I cannot resist saying this; azimuth adjustment has very little to no effect on gain per se. But when you speak of "channel balance", do you refer to the goal of equal crosstalk (R signal into L channel = L signal into R channel), or are you talking about channel balance in the conventional sense, which is not much altered by azimuth adjustment. Thanks for posting; your results are informative.
I set my azimuth visually, because, it is more important to get the stylus properly aligned than to get the electrical generating elements aligned for minimum crosstalk (I am more concerned about record wear than maximum separation). I then used the Fozgometer to see how different the two setting would be. The meter showed a very small error, that when "corrected" per the Fozgometer, I could not optically see the change (i.e., extremely small change). What was surprising is how sensitive the meter is, how unequivocal are the readings (no bouncing needles and having to "guess" at an average reading, etc.), and how quick and easy it is to make the adjustment. This is a terrific tool.
Again, I would still start with a visual alignment, and only make small adjustments away from such an alignment -- if there is a big difference between the two methods, there is something wrong with the cartridge.