ATR Magnetics ATR40907

1/4" x 2500 ft. Master Tape on 10.5" NAB Reel with Tape Care Box

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ATR Magnetics is an analog tape manufacturing company that has won the respect of audiophiles and pro-audio recording engineers worldwide.
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ATR Magnetics is an analog tape manufacturing company that has won the respect of audiophiles and pro-audio recording engineers worldwide.

ATR Master Tape Specifications:

  • Magnetic Characteristics:
    • Coercivity Hc: 365 Oe, BH
    • Retentivity Brs: 1590 Gs
    • Particle orientation: Longitudinal
  • Recording Performance References:
    • Recorder: Ampex-Aria ATR-102
    • Record head gap length: 1 mil
    • Reproduce head gap length: 0.12 mil
    • Track width: 200 mils nominal
    • Tape Speed: 30 ips, 76.2 cm/sec
    • Playback equalization: 17.5, AES
    • Recording bias: 1.4 dB over @ 20 kHz
      • See Recommended Bias chart below*
    • Bias osc. frequency: 438 kHz
    • Recording Level Reference: 185 nWb/m = 0 VU
      • Ampex operating level
    • Frequency Pass Band: 20Hz-20Khz
      • Equivalent wave length of 1.5inches to 0.15 mils
    • Maximum Output Level 1 kHz at 3% 3rd harmonic distortion: 16.5dB
    • Saturation Output Level:
      • 1 kHz: 23.5 dB
      • Level at which linearity exceeds 1 dB of input signal
      • 10 kHz: 16.1 dB
      • 16kHz: 15.2 dB
    • Maximum linear operating level: 9 dB over 185 nWb/m
      • Linearfrequency vs output level through pass band.
    • 3rd Harmonic Distortion: 1 kHz fundamental frequency
    • 0 dB Reference operating level: 0.032 %
    • +6 dB over operating level: 0.096 %
    • +10 dB over operating level: 0.28 %
    • +12 dB over operating level: 0.49 %
    • Signal to Noise ratio (Bias Noise): -68 dB
      • ASA , NAB A weighted
    • Peak Dynamic Range: 86 dB
    • Dynamic range ref to 1%: 82 dB
      • 1 kHz fundamental
    • 3rd harmonic distortion:
    • Linear dynamic range: 78 Db
    • Range in which frequency / wavelength response is linear ±0.3 dB tolerance
    • Print-through characteristic: -60 dB
    • 1K tone on preceeding wrap oftape stored for 24 hours on NAB reel at 72º F

Physical Specifications:

  • Yield Strength: 12 lbs / half in
    • Produces 3% elongation of a 6" test sample
  • Breaking strength: 24 lbs / half in
    • Force that will break a 6"test sample
  • Coating thickness: 0.59 mils
  • Backcoating: 0.03 mils
  • Polyester base film: 1.42 mils
  • Total: 2.04 mils
  • Standard widths:
    • 1/4": 0.246 inches
    • Tolerance +0.0 /-0.002"
    • 1/2": 0.496 inches
    • 1": 0.996inches
    • 2": 1.996 inches
  • Backcoating resistance: ? 30K Ohms
    • Per linear inch by pin probe
  • Oxide coating resistance: >5M Ohms
  • Bias Current Recommendation*: 10 kHz signal, 15 ips; 10 kHz signal,30 ips
  • 1 mil gap length (ATR-Aria): 1.2 dB
    • 0.5 dB
  • 5 mil gap length (Ampex): 3.0 dB
    • 1.4 dB
  • .25 mil gap length (Studer): 3.5 dB
    • 1.5 dB

Note:

ATR Master Tape has a wide acceptable bias current vs. distortion tolerance. The above recommendations are to be used as a guide only.

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