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Altec M49, M50, M51, M52 microphones - includes schematics for 539a and 540a power supplies.

NOTE MISPRINT ON 539a for output voltage on pin 3. It should be ≈ -75V on pin 3, -63V on pin 2. The ones i have are actually reading -69 and -80, respectively.
 

Attachments

  • Altec m49 m50 m51 m52 195a 539a 540a.pdf
    5.9 MB
Last edited:
Hard to find service manual for the 1220...there's a lot to like about these somewhat limited mixers.
 

Attachments

  • altec 1220 service manual.pdf
    1.3 MB

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