[Collins] 6DF5 pin #7 not used in 75S3B?

[Dr. Gerald N. Johnson, electrical engineer]

I had an engineering sample just the right size. One might try
McMaster-Carr (www.mcmaster.com) look for nickel alloy foil. I probably
used something like .010" maybe thicker. Probably plain steel 1/16"
thick would do as well. Someone makes an after market shield box, since
the later production runs included it from the factory. I think I tried
a angle of heavier steel, but the mumetal fit under the filter clamp
better. Now that I have a crystal filter for CW, neither the clamp, nor
the shield box are workable options, yet the mumetal stays on the SSB
plastic cased filter.

73, Jerry, K0CQ
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Reproduction by permission only.