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Sensor Transistor and Biasing Trimmer (Beogram 4002/4 and 4000)

Sensor Transistor and Biasing Trimmer (Beogram 4002/4 and 4000)

Regular price $20.00 USD
Regular price Sale price $20.00 USD
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Beolover Sensor Arm LED Light Source for Beogram 4002/4 and 4000:

  • Replaces the sensor transistor and biasing resistor in any Beogram 4000, 4002 and 4004.
  • Many original transistors lost some of their gain, which may disable the record detection function. As a consequence the arm may drop on an empty platter. Ouch!!! Replacement ensures that the record detectionj functionality works properly.
  • Replacing the original fixed value biasing resistor with a 5MOhm trimmer allows adjusting the bias to meet the gain spec given in the manual (4V at collector)
  • Direct drop in replacement. Replaces 1TR3/R26 in DC motor Beogram 4002 (Type 551x/552x), 1TR9/1R33 in AC motor Beograms (Type 550x) and 1TR14/1R33 in Beogram 4000 models.
  • Comes with alignment fixture to position LED board in correct location.
  • See this Beolover blog post for an introduction to the restoration of the sensor arm and record detection circuit.
  • Installation requires soldering/desoldering capability, and potentially requires an oscilloscope for trouble shooting. Some experience with electronics is helpful.
Follow us on the Beolover Blog for updates and info about our B&O restoration efforts.
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