Tape Recording Electronics

Model 375

Tape Recording Electronics

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THIS PRODUCT IS NO LONGER IN PRODUCTION.

The Inovonics 375 is a compact, up-to-date magnetic recording electronics package, completely self-contained with integral power supply.

Available in several versions, the 375 is equally well suited to new installations, or to improve the performance and reliability of older professional tape recorders.

Features

Specifications

Documentation

Features


  • Use of electronic signal switching in monitor mode and for equalization selection, eliminating contact noise.

  • Automatic transfer of monitor to INPUT when entering the RECORD mode from SYNC.

  • Three speed equalization with wide adjustment range, accomodating both NAB and IEC characteristics at any speed from 3-3/4 to 30ips.

  • The Record Amplifier incorporates a "linearizer" circuit which may be user-adjusted to significantly reduce tape-generated odd-order harmonic distortion.

  • Two separate preamplifiers handle the normal reproduce and the SYNC reproduce functions

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Specifications


Frequency Response (in Hz ±2dB)

  • 30ips OVERALL/60 - 22k/ SYNC/60 - 20k

  • 15ips OVERALL/30 - 22k/ SYNC/40 - 16k

  • 7.5ips OVERALL/20 - 16k/ SYNC/30 - 8k

Signal-to-Noise Ratio (in dB)

  • 30ips/OVERALL (u’wtd -71/ wtd -78)SYNC (u’wtd -71/ wtd -80) STANDBY(u’wtd -80/ wtd -87)

  • 15ips/OVERALL (u’wtd -67/ wtd -76)SYNC (u’wtd -67/ wtd -77) STANDBY(u’wtd -74/ wtd -85)

  • 7.5ips/OVERALL (u’wtd -68/ wtd -77)SYNC (u’wtd -68/ wtd -79) STANDBY(u’wtd -74/ wtd -85)

Erasure

With 250kHz erase/bias frequency, more than 75dB erasure of 500Hz signal recorded 12dB above 320nW/m Operating level.

Recorded Distortion (THD of 1kHz signal)

  • At Operating Level: LIN out/0.50% LIN in/0.15%

  • 3dB Operating Level: LIN out/1.00% LIN in/0.30%

  • 6dB Operating Level: LIN out/2.50% LIN in/0.80%

Amplifier Distortion (THD)

  • Record: 0.1% at Operating Level / 0.05% at 25dB above Operating Level

  • Repro: 0.1% at Operating Level (Clipping Level +25dBm)

Input

  • Sensitivity: -20 to +8dBm

  • Impedance: 10K, unbalanced

Output

  • Level: Adjustable for +4 or +8dBm from Operating Level recording; Clipping Level +25dBm

  • Impedance: Unbalanced from low impedance “voltage source” output stage. Can drive 1:1 transformer for isolation if required.

Power Requirement

±20VDC (bipolar) regulated, at 200mA per channel (including indicators) plus 250kHz sine wave at 1V r.m.s. Power Supply requirement can be met with Inovonics A/N 129403 printed-circuit assembly when combined with power transformer, bridge rectifier and filter capacitors adequate for the current required.

Size and Weight

3-1/2” x 19” x 7”; 121bs.

Documentation


375 Manual