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Re: [ARSCLIST] MX5050 speed change
At 01:22 PM 6/21/2006, John Loy wrote:
We tried extensivly to do that change but were
told it is time consumeming and counter
productive to do then have to change back and
forth all the time. If it is something permanent or you have a whole
lot of tapes to do I would suggest it. The
manual should give you step by step
instructions. Of course re-alignment etc will be
in order. What we have done to keep workflow
going is just to record into our DAW at 3 3/4
speed on 88.2 sampling rate . Then manually
change the sample rate to 44.1 and there you have it.
It is a little more complex than that as there needs to be re-equalization.
You can either get a 1.88 in/s test tape and
align the machine playing it at 3.75 for flat
response OR you can record the tape on your DAW
and flatten the response in the DAW.
Doing the latter means you don't have to adjust the tape machine's EQ at 3.75.
I hope to publish a table of cross equalizations.
Jay McKnight has some in his Choosing and Using
document at www.flash.net/~mrltapes/
But his are what you set the test tape to in
order to use the test tape to calibrate the
machine at another speed. To play the test tape
flat, you need the inverse of his numbers.
I've been struggling with Excel and testing a
variety of test tapes and EQs to confirm my
spreadsheet is working properly. Jay did this
long ago and while he was quite genial, he had
other projects on his mind at the moment, so I'm
on my own with this one. Please be patient.
I THOUGHT at least some versions of the Otari
MX5050 had a hysteresis-synchronous capstan motor
which would mean changing pulleys if it is belt
drive or the capstan diameter (which would affect
the whole tape path) if it were direct drive. The
MTR-10/12 are servo'd capstan motors.
The other issue is the head gap length. Typical
repro head gap lengths are in the neighbourhood
of 2-2.5-3 µm (~80-100-120 µin) while the Studer
loggers have head gap lengths of 1.4 µm (~55 µin)
which places the gap loss first null at a higher wavelength/frequency.
The gap loss calculations are on the MRL Web site
as well--as well as a program somewhere to calculate it.
Richard L. Hess email: richard@xxxxxxxxxxxxxxx
Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX
Detailed contact information: http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.