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Old 6th November 2018
  #13
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Richard Crowley's Avatar
 

There were probably several variations of the internal details of even that one model.
Replacing the incandescent bulbs with LEDs would require the electrical and mechanical details.
What voltage is being supplied to the incandescent bulbs? What is the mechanical arrangement.

Have you seen this discussion?:
Pro VLA VU Meter Lamp

And this response #9 . Does this look like your unit?
Pro VLA VU Meter Lamp