Re: Revox A700 flutter only at 7.5ips?
Shawthing, are you quite sure your test procedure - of listening to various classical music tapes - is sound? If you are using different tapes for testing the different speeds this could be a source of error. One tape might have more friction, or stiction, than another for example. Or there might be more recorded W & F on one tape than another.
Also, different types of music vary in how much they expose W and F in a tape machine. For example, long, drawn out piano chords are great for revealing Wow. Whereas a musical instrument with much vibrato/tremolo, or short notes in rapid succession, can disguise speed irregularities.
Best to test in a way that the only factor you are changing at a time is the tape speed. I agree with Michael that a scope view of the speed sensor inductor's output would test the capstan motor's speed stability.
Last edited by TIMTAPE; 3rd Dec 2017 at 3:10 pm.
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