[Orion] Orion - Fan Noise

[ac5aa@juno.com]

Henry, I reported the exact same problem about a year ago.  I used a "shielded" audio Y-cable from Rad Shack to power the light in my TT 238B and the fan.  As long as the fan and the 238 were connected, the noise continued.  If I plugged the fan in directly, or even thru the Y but without the 238, no noise.  I moved the 238B to another power supply.  Problem solved.  Not sure how it's getting noise in, but I'm suspecting a ground loop problem. 

  73,  Duane

Duane Calvin, AC5AA
Austin, TX