There used to be a guy on eBay selling dubs of test tapes. Steve Smolian ----- Original Message ----- From: "Richard L. Hess" <[log in to unmask]> To: <[log in to unmask]> Sent: Friday, January 28, 2011 3:41 PM Subject: Re: [ARSCLIST] Test tones circa 1978 > Hi, Shai, > > 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 > > Cheers, > > Richard > > 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. >> 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 >>>> >>> >> > > -- > Richard L. Hess email: [log in to unmask] > Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX > http://www.richardhess.com/tape/contact.htm > Quality tape transfers -- even from hard-to-play tapes.