MCM Electronics

Audio Generator By Tenma (72-455A) MCM Part #72-455A

3.5 stars 3 reviews
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MSRP: $299.00
You Save: $140.00 (47 %)

Highly versatile audio generator is perfect for sound system and speaker component testing. Its high precision, multiple step attenuation and selectable sine/square wave output make it suitable for the any bench or serious test environment.

Specifications Top

  • Low distortion
  • 10Hz ~ 1MHz audio in in five range steps
  • Sine and square wave output
  • Continuously variable amplitude
  • Selectable 10dB, 20dB, 30dB, 40dB and -50dB attenuator
  • External sync input
  • Includes owners manual, test leads and power cord

  • Generator frequency: 10Hz ~ 1MHz, ±0.5dB (600ohm load)
  • Sine wave output: 7V RMS (no load)
  • Distortion (x100 range): ≤0.1% (400Hz ~ 20KHz)
  • Distortion (x10 range): ≤0.3% (100Hz~100KHz)
  • Square wave output: 10V p-p (no load)
  • Rise/fall time: ≤200nsec
  • Overshoot: <2%
  • Output impedance: 600ohm
  • Power requirements: 120V/240VAC, 50/60Hz
  • Dimensions: 5 1⁄2" (W) x 7 3⁄4" (H) x 10" (D)
    Part Numbers
    MCM Part #:72-455A
    Tenma Part #:72-455A
    Package Specifications & Dimensions
    Weight:7.262 lbs.
    Warranty:365 days
    Need to Return?
    Length:13.5 in.
    Width:11 in.
    Height:8 in.
    Shipping Information
    Extra Shipping Charge:No
    Drop Ship:No
  • Product Reviews Top

    • by solsamet

      on 5/15/2016

      Excellent Value

      Overall: 4.5 out of 5

      Mine exceeds the published specifications. Although a meaningful statistical analysis for my sample size of 1 may not mean too much, this is really a useful tool. Mine measured just 0.02% THD at 1 kHz, 10kHz, and 0.022% at 20kHz. The distortion content is 2nd harmonic with just a touch of the rectifier circuit that stabilizes the amplitude visible. The low frequency THD does increase to around 0.035% at 100Hz. The distortion stays the lowest at the low end of the range. Example, 1kHz is better using x100 and 10 on the dial than x100 on the dial and the x10 range. The amplitude from 20Hz to 20kHz stayed within 0.15dB. The square wave is clean and symmetric with no overshoot or ringing. The ability to go to 1MHz is great for testing the I.F. stages of old AM radios and really making sure amplifier circuits are properly filtered or stable among other things. The only thing is the frequency adjust feels plastic and cheap compared th the old LAG120 it replaced.

    • by Denham

      on 9/11/2015

      72-455A - Audio Generator

      Overall: 4 out of 5

      Great Unit. We use 6 of them daily and just purchased 2 more for new tech benches. Highly recommended.

    • by richjohnson

      on 3/8/2014

      Great audio generator, poor reliability

      Overall: 2 out of 5

      Mine keeps blowing the 100mA power fuse, near the power receptacle.

      bought this several years ago, used it a few times, after some time I blew the 100mA power fuse on the rear probably touching the output lead where I should have avoided.

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