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TOPIC: MS-100 booth monitor repair

MS-100 booth monitor repair 19 Jun 2006 20:24 #22380

  • Ken Layton
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I just repaired a Component Engineering model MS-100 booth monitor amplifier.

Symptom: Noise in the speaker sounds like pink noise when the channel selector switch is in any other position _except_ "MIX".

Solution: I found a defective type TL072 integrated circuit (low noise op amp). Replaced it with an NTE 858M and everything was good to go. Sounds great again!

[This message has been edited by Ken Layton (edited June 20, 2006).]
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Re: MS-100 booth monitor repair 19 Jun 2006 22:29 #22381

  • rodeojack
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The TL072 is pretty common, Ken, as is the "074". I used it in the first FM systems I built for my place in '87.

Is that NTE 858M the same chip, or could you have found a real "TL"?
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Re: MS-100 booth monitor repair 20 Jun 2006 05:59 #22382

  • Ken Layton
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The NTE 858M is what the TL072 crosses to. Sure I could have gotten a real TL072 from Jameco for 53 cents, but this unit needed to be repaired immediately, so I went across town to my local electronics parts jobber, Electronic Resourcing (formerly known as J.W. Electronics years ago) and bought the NTE replacement. I strongly suspect the NTE replacement is in reality a TL072 rebranded with an NTE number anyway.

[This message has been edited by Ken Layton (edited June 20, 2006).]
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