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    HELP! Wiring D104 TUG 8 to Royce 1-621

    I have a FOUR wire D104 from 1975 I am trying to wire to a Royce 1-621. When wired according to every diagram I have found 1- White 2- Shield 3- Red 4- Black, it screeches from the speaker. Keyed up it is fine, good modulation but as soon as I unkey it squeals like a stuck pig from the speaker...