ATR Magnetics ATR1040907P
1/4" x 2500 ft. Master Tape on 10.5" NAB Pancake

OUR PART #  ATR1040907P

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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.

NOTE: This item comes in an individual corrugated storage pack.

ATR Master Tape Specifications:

Recording Performance:

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 chartbelow* 
  • 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 linearityexceeds 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 inwhich 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" testsample
  • 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.

© 2014 Full Compass Systems, LTD  9770 Silicon Prairie Parkway, Madison, WI 53593  All rights reserved.

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inaccuracies in our catalog or web site. Prices are subject to change without notice.