Re: [ARSCLIST] Constant Tension Machines

[Rod Stephens <savecal@xxxxxxxxxxxxx>]

>

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.

Rod Stephens

> Richard L. Hess wrote:
>
> > >
> > Rod,
> >
> > 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.
> >
> > Cheers,
> >
> > Richard