Ian Jackson wrote:
In message , AZ
Nomad writes
On Wed, 9 Dec 2009 15:42:00 -0000, N_Cook wrote:
Ron wrote in message
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N_Cook wrote:
Ron wrote in message
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N_Cook wrote:
Arfa Daily wrote in message
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"N_Cook" wrote in message
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Set up a sig genny and test him out


Much easier to say the test tape is stretched.
Perhaps perfect pitch testing would only work by playing the likes of
JSB
Tocatta and Fugue in D major, not pure tones

Has anyone ever heard of a tape stretching enough to be detectable?
I find that very hard to believe. Far more likely that the motor's
speed control is off.

Do you have another deck you can use? Record 5 minutes on the reference
deck and then compare the time to play the same on the test deck.
I've used a CD recording and then played the CD at the same time as
playing the tape on the test deck. If they fall out of sync then the
test deck is running at a rate different than the reference deck.

That's exactly the way I have (occasionally) adjusted the speed of a
tape deck.

Record a CD track on a known (or hopefully) good deck, and play it back
on the suspect deck, while simultaneously re-playing the CD. A bit of
skilful nudging of the tape deck 'pause' and 'fast-forward' buttons will
be needed to get the audio adequately synchronised.

As you tweak the tape speed control, you will may get the two tracks in
almost perfect synchronism (producing a pleasant echo effect!). However,
this condition will probably hold for maybe only 10 or 20 seconds, after
which the tape audio will start to creep either 'early' or 'late', and
may even wander between the two.

At the end of a typical 3 minute track, the audio may be a a few seconds
out, and no matter hard you try, you are never going to do better. But
not even the most ardent audiophile with perfect pitch could ever detect
that the speed was incorrect.

You underestimate audiophiles sir!