Happy Easter - CTC-5

[Penthode]

Thanks for the response! (Excuse the pun).

It had crossed my mind that the inductance of the peaking coils may have shifted over the years. However my late 1940's RCA sets have very sharp pictures and can resolve the 4MHz test pattern bar. So maybe it was the limit RCA put on the luma response in those early years to conceal the dots.

I have an old Measurements Lab Grid Dip Meter and the application notes include using it to help design the video amp and choice of peaking coils.

Thanks for confirming what had been in the back of my mind for some years that changing the coils can alleviate the narrow luma bandpass.