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circa 1958 RF channel delay frames were included in the RCA-TRT-1A/B. One for record delay, second for playback. You set the playback on a test tape for straight lines then set the record knobs to the opposite settings so recorded tapes were correct. Ampex made tgeirs later. The Ampex manual delays may have come after the TRT-1, seemed rare on VR-1000’s. I don’t know if Ampex used two like RCA, but Amtec came out about 1961 and solved the playback problem. RCA built ‘ATC’ as option for the TRT-1 same method as Amtec, a voltage variable delay line with varactors.
Early on Ampex shipped the head assy with the tape especially if there were to be additions because of head differences.
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