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Title: collins 75s3b/c receiver 2nd mixer mod Post by: w4bfs on June 03, 2019, 02:27:01 PM When a 6 kHz mechanical filter is installed the existing 455 kHz transformer (T5 I think) is unused. a while back someone added it into the 2nd mixer plate circuit to drive the selected mechanical filter. I have looked and cannot find the article (one found but site no longer avail). Anyone have this info? AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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