Oh, one other thing, Richard.
I'm sure that tape pack and holdback tensions do create minor speed
variations across the heads for the length of a reel, but none that can
induce a pitch change as great as I experienced when the Scully was
running from head to tail with a musical drop of a half-step in pitch.
I know that _was_ consistant, since I had opening and closing show
music cues that I could check that exhibited the same pitch change.
> Richard L. Hess wrote:
>> I'm sure you know, but I'd like to point out that in constant torque (as
>> opposed to constant tension) machines, this speed variation was variable
>> throughout the tape pack.
>> Classic Ampex machines were mostly constant torque. There was a constant
>> tension option for certain versions of the AG-440.