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well for practice I got the BK 417 setup and did a sweep on a working set, the IF curve looked a bit off, curve at the 42.67mhz was low, so rather than a flat topped with dip at 44 it was more a peak on one side of the 44 and low on the other. But the set works fine so it may just be something I am doing in the setup that is killing the gain in that part of the band.
I used a ungrounded tube shield on the osc tube (B+ pulled to the tuner) and set the AGC bias and RF output to avoid clipping.
I will have to try it on a couple other sets to see if the curve is any different.
Kinda good to do this now and then if for no other reason just to practice.
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