You can trust the MRL flutter tapes, not the normal calibration tapes.
I think Jay says that some place in the literature.
There are better ways to calibrate speed involving long-term
On 2011-01-28 3:11 PM, Shai Drori wrote:
> If I can't trust an MRL test tape for speed accuracy then what options
> do I have? This is a hot issue for me now since I need to calibrate
> all machines for speed as well.
> On 27/01/2011 23:38, Richard L. Hess wrote:
>> Hi, Jim,
>> One thing that I used to do for quick testing was using a Sound
>> Technology 1710A leave it punched on 20 Hz then just go up the scale
>> 20-200-2000-20000 Hz, but that was more for testing than slate tones.
>> I made a function generator that was nominally 10-100 per band but
>> had a modification switch to go from 10-200 so I could sweep 1K-20K
>> for recorder alignment without range switching.
>> I would never trust "alignment" tones at the front of the tape for
>> speed setting. In fact, you can't even trust an MRL calibration tape
>> for that, other than the flutter test tapes, and that's not as
>> accurate as you need for setting speed precisely on a recorder (which
>> should be done with a large-diameter TAPE tachometer. This is a whole
>> large issue, actually.
>> Then, what Tom said, often times the tones were spliced on from a
>> different session.
>> On 2011-01-27 1:40 PM, Jim Sam wrote:
>>> Does anyone know how much test tone generators varied circa 1978?
>>> I know not to expect digital accuracy. For example, I would not
>>> expect a 10.00 kHz tone, but how much leeway was there? +/- 0.25kHz,
>>> +/-0.5 kHz, +/-1.0 kHz, etc.?
Richard L. Hess email: [log in to unmask]
Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX
Quality tape transfers -- even from hard-to-play tapes.