I also concur on the general coverage version over the ham band only, but
again, it's a personal choice.
To me the biggest drawback to the 51J series is the 500 kc/s i.f. It is
much more difficult to find mechanical filters for them, although a few
years ago I checked out the Collins/Rockwell website, and they still make
them in a wide variety of selectivities. The impedances are way too low for
tubes; the modern ones are designed to go into solid state equipment, but it
shouldn't be too difficult to use stepdown/stepup transformers to make them
match. That's what's inside the Curry replacement 75A4 filters advertised
in Electric Radio.
Don K4KYV
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