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.
Shai
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.
>
> Cheers,
>
> Richard
>
> On 2011-01-27 1:40 PM, Jim Sam wrote:
>> All,
>>
>> 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.?
>>
>> Thanks,
>> Jim
>>
>
|