Reference tape

For sale is one new reel to reel calibration tape for AKAI 4000 DX recorders. The calibration tape is intended to be used for adjustind AKAI 4000 DX reel to reel recorders.

• The tape is recorded on a full refurbished and correct adjusted Revox B77 Mk2 half track machine.
• My Revox recorder has a actual wow & flutter level less than < ± 0.025 % ( JIS )
• Measured with a LEADER LFM-39A wow and flutter meter.

Frequencies and reference levels are generated by a custom made automated frequency sequencer with fully digital controlled DDS generator for ultra-low distortion.

• The actual recording levels are measured by the integrated digital AC thru RMS dBm meter section on the sequencer / calibration box for highest recording accuracy.
• Frequency accuracy of the test box is better that 0.01% and the reference levels are better than +/-0.5 dB
• The test tape is recorded as half track at 19 cm/s (7½ ips) containing the following tracks:
  • #1 16 KHZ -20 dB at 7 1/2 IPS for azimuth
  • #2 250 Hz at +4dB at 7 1/2 IPS for playback level adjustment
  • #3 3kHz at 0 dB at 7 1/2 IPS for speed and wow & flutter test according to the JIS norm
  • #4 700 Hz 0 dB at 7 1/2 IPS
  • #5 1 kHz 0 dB at 7 1/2 IPS

Duration of each track is 120 sec

• The test tape comes with green / red leader tape for easy direction identification on a 15 cm reel
• The tape is recorded on new BASF LPR35 ( Pyral ) tape.

Note that the tape is recorded “Tale end out” and need to be rewind to an empty reel before use.

This operation ensures that the test tape is aligned on the reel according to the tape recorder under tests actual tape feed mechanisms alignment for maximum precision during the test.

I always recommend storing the Reference tape “Tale end out” for protection and minimal “print trough”

If other recording speeds are required please contact me

The Recorder and the test box / wf meter are not for sale.

Niels

EE B.Sc