MX110 MPX Stereo indicator gel and bulb

Discussion in 'McIntosh Audio' started by monkboughtlunch, May 16, 2017.

  1. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,306
    Anyone know the correct bulb # for the MX-110 "MPX Stereo" indicator light?

    I couldn't find anything about how to access and replace this bulb. Does one need to remove the top panel (same panel to change out the EM87 eye tube)?

    Also, if the "MPX Stereo" red gel is sagging on one side (so the text is angled) can the gel be taken off easily without damaging it -- and re-leveled and reapplied with some type of glue or contact cement?
     
  2. dewickt

    dewickt Will fix about Anything

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    Location:
    Knoxville, TN
    Yes you will have to pull the dust cover, 6 small knobs with set screws first, then 2 screws on each side, and the cover should come off.
    Original lamp was a #1850, though a #1847 will work just as well, just a bit brighter.
    Now the fun starts, hope you have small fingers,
     
  3. monkboughtlunch

    monkboughtlunch Super Member

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    1,306
    Thanks Terry. Can an LED be used instead of a bulb? For example this one:

    http://www.soslightbulbs.com/produc...amp-1850-led-equivalent-miniature-light-bulb/

    Lamp# 1850 LED Equivalent Miniature Light Bulb
    Choose between 2 Lens Types: Dome Version (default) OR Short Version

    Note: SOS has added a new color, 5000 kelvin white. If you have been purchasing white leds from us in the past, your version is the 4000 kelvin white.

    This is a direct LED replacement for Minature Bayonet Based miniature incandescent lamps. These LEDs are ideal for mission critical applications such as power plant displays, industrial equipment, and elevator controls. Long-life, low power consumption, shock resistance, and extreme thermal tolerance make LEDs ideal for harsh industrial environments.

    Dome Version: A molded diffuser lens increases the viewing angle making this LED more suited for use behind larger displays, switches or lens covers.

    Features and Benefits:
    - Up to 90% Energy Savings Over Incandescent Lamps
    - Long Life, 100,000 hours, Almost 10 years
    - Reduces Relamping Labor Cost
    - Shock and Vibration Proof
    - Lower Operating Temperature
    - Increased Safety, No glass that can shatter

    LED Equivalent Specifications:
    Lamp Shape: T3.25 (10mm)
    Base Style: Miniature Bayonet (BA9S)
    Length MOL: 1.10"
    Diameter MOD: 0.40"
    Electrical Data: 5-28V AC/DC (Bi-Polar), 20ma
     
  4. dewickt

    dewickt Will fix about Anything

    Messages:
    3,382
    Location:
    Knoxville, TN
    Should work, if it doesn't there should be no harm done except to your budget, .50 $ verses $30 (must buy 5).
     
  5. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,306
  6. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,306
  7. monkboughtlunch

    monkboughtlunch Super Member

    Messages:
    1,306
    During the "Z" series MX110 run from 1963 - 1969, McIntosh made only a few minor cosmetic changes. One of those minor unexplained changes was the MPX Stereo indicator gel. Early versions (1963- approx 1965) had MPX stereo in red on a blacked out background. Later versions (approx 1966-1969) reversed that: (black text on red background).

    Any idea on why McIntosh went to the trouble and fuss of making such a minor cosmetic revision to an indicator gel? Were the earlier MPX Stereo indicator gels hard to read? Or was the McIntosh design department trying to make the stereo indicator the same symmetrical size when lit as the EM87 tube, hence the red backlit rectangle in the later versions?

    110stereogel.jpg
     
    Last edited: May 18, 2017

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