Audio Cassette Speed Calibration Test Tape 3150 HZ

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Brand new test tape for calibrating the speed of your cassette decks.

Specs:
- 440 HZ A tone (for quick check with instrument tuner) (or MIDI note 69)
- 3150 hz tone for setting speed with frequency counter and checking wow and flutter
- Recorded in stereo, not full-track

Speed tolerance: 0.16%

Notes
The speed variance to move a half tone from A 440Hz to A# at 466.16 Hz is 5.9%. That's a lot .Most cassette decks should be operating well within half or a third of that range. But if you're doing tape copies you need a much tighter tolerance to avoid cutting off the music or having a huge empty space at the end of the sides, especially on longer tapes of C-50, C-60, and longer 

We have compared the speed of our test tapes against old test tapes from Sony, TEAC, and Nakamichi. Our test tapes play back the 3150 Hz tone with comparable variance as we found with those old test tapes. The variance of our tapes is +- 5 Hz or 0.16%. When adjusting speed your target is 3145 to 3155 Hz. But most of you won't have a frequency counter so we've included a 440HZ A tone to calibrate with any guitar or instrument tuner. You should be able to get within 0.5% using the 440 Hz tone.

If you want to dub your own tapes consider this:

1% speed variance on a 30 minute side is 18 seconds per side
2% speed variance on a 30 minute side is 36 seconds per side
3% speed variance on a 30 minute side is 54 seconds per side 


Adjusting The Speed of Your Cassette Deck
Posted on July 2, 2017 by George
Every cassette deck runs at a slightly different speed. The tolerance of a machine made in 1990 when brand new was 0.5% to 2%. After 25+ years, it is pretty sure that your 25 year old machine needs new belts and a speed calibration. An exception could be made for machines with direct drive capstan motors. Very few machines had direct-drive capstans because they were very expensive.

How to adjust the speed of cassette decks
Many cassette decks have a hole in the back of the capstan motor. This hole is usually covered by a rubber shroud, and you can insert a small jeweler’s screwdriver to connect with a potentiometer which allows adjustment of the speed. This adjustment is often very sensitive and it’s difficult to get a very precise and stable speed – a very small adjustment can result in a huge speed variance. Better decks might have an adjustment potentiometer on the PC board which allows a much more precise setting of the speed.

We offer a test tape containing a 440Hz A tone and a 3150 Hz tone to assist in setting the speed of your cassette deck.