Standard Alignment (Calibration) Tapes
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1/4" Reel-to-Reel
Each Tape is a Full-track Master tape (not a copy). Tapes are recorded using OTARI Reel-to-Reel MX-5050BIII-F-P and MTR-12 production full-track tape recorders and professional test equipment from NTI (NEUTRIK). The Capstan motor of the tape recorder is controlled by digital Quartz- Locked PLL. This can work at standard speeds with 0.01% accuracy, and at any speed from 1-7/8 to 30 ips using an external clock generator. If required a tape can be recorded at any speed between 1-7/8 IPS and 30 IPS.

Reproduction or Playback Head of the tape recorder is a 4-track 4-channel head to measure Level unevenness @ 1000 Hz.
PLEASE NOTE. Level unevenness is checked totally across the tape (not along the tape) before recording. Tapes with difference in Level more than 0.2 dB are discarded

Reproduction Equalization is calibrated using a Constant Magnetic Field Transducer which has been designed by GennLab.
Tapes, recorded to the following Equalization Standards can be ordered.

30in/s (76.2 cm/sec) speed:
AES (1971),
Ampex Professional Equipment,
CCIR (1953 or earlier to 1966),
IEC (1968),
DIN (1962) or, to any other Standard with specified Custom Time Constants.

15 in/s (38.1 cm/sec) speed:
NAB (1953 and 1965),
NAGRA MASTER,
EIA (1963),
IEC (1968),
DIN (1962),
CCIR (1953 or earlier to 1966) or,
to any other Standard with specified Custom Time Constants.

7-1/2 in/s (19.05 cm/sec) speed:
Ampex Professional Equipment,
NAB (1965),
RIAA (1968),
EIA (1963),
DIN home equipment (1966),
EIA Standards Proposal 1015,
Ampex Stereo Tapes and Consumer Equipment (1967),
CCIR (before 1966),
CCIR (1966),
IEC (before 1968),
IEC (1968),
DIN Studio (before 1966),
DIN Studio (1966) or, to any other Standard with specified Custom Time Constants.

3-3/4 in/s (9.525 cm/sec) speed:
EIA (1959),
Ampex Professional Equipment (1953 to 1958),
Ampex Professional Equipment (1959),
DIN (1962),
EIA Standards Proposal 1015,
Ampex Stereo Tapes and Consumer Equipment (1967),
NAB (1965),
RIAA (1968),
IEC (1964),
IEC (1968) or, to any other Standard with specified Custom Time Constants.

1-7/8 in/s (4.7625 cm/sec) speed:
Ampex Consumer Products,
DIN (1966),
IEC (1968),
RIAA (1968) or, to any other Standard with specified Custom Time Constants.

Duration of each tape 7 min 26sec.

Each track is voice announced.

The following tracks are included (Track 4 is 20 kHz Fine azimuth set
in 30" tapes)
:

Track 1. 1000 Hz at Reference Fluxivity. 30sec.

Track 2. 8000 Hz. Coarse azimuth set. 20sec.

Track 3. 15000 Hz. Fine azimuth set. 20sec.

Track 4.
1000 Hz  at +12 dB level. 30sec. It is recorded precisely between
               Track 1 and Track 3 of a 4-track tape, or between the left and right
               channel tracks of a 4-track stereo tape. This signal can be used for
              quick calibration of Reproduction Head height of a 4-track tape recorder.
               Adjust the Reproduction Head height to obtain MINIMUM reading
               of the output signal for both channels.
               Repeat this step and the "Fine azimuth set" step a few times.
               The Track position on tape optically measured using Magnetic Field
               Developer (MFD), which has been designed by GennLab, and
               an industrial microscope equipped with a micrometer eyepiece.
   Please note Track 4 is 20 kHz Fine azimuth set track in 30" (76.2 cm/sec) tapes.
*Please note all prices are in $US. Your order can not be processed until payment has been made for shipping. Follow the instructions below.
Click on the buttons below to order tapes
30in/s (76.2 cm/sec) tapes
15 in/s (38.1 cm/sec) tapes
7-1/2 in/s (19.05 cm/sec) tapes
3-3/4 in/s (9.525 cm/sec) tapes
1-7/8 in/s (4.7625 cm/sec) tapes
Customer feedback
GennLab Calibration Tape sample

GennLab Calibration Tape sample

Click on the picture to enlarge
Track 5 to Track 20. Frequency Response Test which is recorded at:
0 dB level for 30 in/s (76.2 cm/sec)speed and for 15 in/s (38.1 cm/sec) speed;
-10 dB level for 7-1/2 in/s (19.05 cm/sec) speed and for 3-3/4 in/s (9.525 cm/sec) speed;
-20 dB level for 1-7/8 in/s (4.7625 cm/sec) speed.

Track 5. 400 Hz Frequency Response Test Reference level. 20sec.
Track 6. 31.5 Hz. 10sec.
Track 7. 50 Hz. 10sec.
Track 8. 100 Hz. 10sec.
Track 9. 200 Hz. 10sec.
Track 10. 400 Hz. 10sec.
Track 11. 800 Hz. 10sec.
Track 12. 1000 Hz. 10sec.
Track 13. 2000 Hz. 10sec.
Track 14. 4000 Hz. 10sec.
Track 15. 8000 Hz. 10sec.
Track 16. 10000 Hz. The last frequency for 1-7/8 in/s (4.7625 cm/sec) speed. 10sec.
Track 17. 12500 Hz. 10sec.
Track 18. 15000 Hz. The last frequency for 3-3/4 in/s (9.525 cm/sec) speed. 10sec.
Track 19. 18000 Hz. 10sec.
Track 20. 20000 Hz. 10sec.
Track 21. 1000 Hz at Reference Fluxivity. 30sec.
Track4. GennLab destructive MFD.

Track4. GennLab destructive MFD.

Track4. GennLab nondestructive MFD1.

Track4. GennLab nondestructive MFD1.

Click on the picture to enlarge
Track 4 visualized using 2 different GennLab Magnetic Field Developers
Speed Calibration Tapes
Click to download bilingual version of tape description Eng. -Russian.
Recording System

Recording System

1-7/8 to 30 ips and Speed Tape Recording Machine

1-7/8 to 30 ips and Speed Tape Recording Machine

Click on the picture to enlarge
Elcaset Calibration Tapes
7-1/2 in/s (19.05 cm/sec)
400 Hz Dolby Calibration Tape
170321