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Possible causes for loss of high frequencies?

Discussion in 'Tape' started by Aerochrome, Sep 12, 2018.

  1. Aerochrome

    Aerochrome Member

    Messages:
    78
    I'm currently working on a Pioneer Hipac tape player, and have almost no high frequency sounds being reproduced. Tapes sound fine in another player, speed checks out, adjusted head position, and even bypassed the poweramp to get the line level from the headamp chip (A Mitsubishi M5111, if you have the datasheet please get in touch) and off the headamp chip it still has no high frequency sound. I have recapped the unit, and the only component between the head and the headamp is a tiny ceramic capacitor. Could the M5111 have partially failed?
     

     

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  2. oldvinyldude

    oldvinyldude AK Subscriber Subscriber

    Messages:
    1,644
    Location:
    Buckeystown Maryland
    Head cleaned thoroughly?
     
  3. Aerochrome

    Aerochrome Member

    Messages:
    78
    Cleaned and Demagnetized.
     
  4. kfalls

    kfalls Super Member

    Messages:
    1,089
    Location:
    Dennison, Illinois
    What do you mean by "adjusted head position"? Have you checked all adjustments azimuth, tracking (height), tilt? Have you looked at the Dolby NR? Taking the hisss out sometimes makes it sound "duller". Does the deck have options for Type 1, Type 2 and Metal tape?
     
  5. Aerochrome

    Aerochrome Member

    Messages:
    78
    The Hipac format was in it's "prime" in the very early 1970s, and never had any options for tape formulations or NR.
     
  6. GPS16

    GPS16 Well-Known Member

    Messages:
    696
    Location:
    UK Manchester
    Hi Guys,

    in my case, my age!!!

    GPS16
     

     

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