General Category > Prerecorded Tapes

Dolby level for Ampex Dolby tapes


Does anybody have any information on the level that Ampex assumed for the standard Dolby level on their later pre-recorded Dolby B tapes?  Since they didn't record any Dolby tones it's not clear.  I have always guessed that they used 185nW/m as the Dolby level, but I wonder if somebody has some real (reel?) information.


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