[Collins] Needs Help

[Dr. Gerald N. Johnson, electrical engineer]

The F455 FA 21 is the standard plug-in SSB filter in 75S3B, perhaps
earlier. The four digit group beginning with 7 is date code, not an
identifying mark. 526 9427 00 is the Collins part number for the part.

This should be among the most common of Collins filters, though there
are others that should fit the sockets.

73, Jerry, K0CQ
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Entire content copyright Dr. Gerald N. Johnson. Reproduction by
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