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Atwater Kent 84 question
Mondial
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Posts: 1,114
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Joined: Feb 2013
City: Irvington, NY
#3

09-27-2014, 07:38 PM
Check the two 10 ohm filament shunt resistors (flex type). If one of these is open it will cause a hum. 

These two resistors set the electrical center of the 2.5V filament winding which is referenced to ground. They perform the same function as a center tap of the filament winding. This is important because the 47 output tube has a directly heated filament, so to cancel hum the two filament pins must be balanced to ground.
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Messages In This Thread
Atwater Kent 84 question - by fields 100 - 09-27-2014, 05:09 PM
RE: Atwater Kent 84 question - by morzh - 09-27-2014, 05:51 PM
RE: Atwater Kent 84 question - by Mondial - 09-27-2014, 07:38 PM
RE: Atwater Kent 84 question - by fields 100 - 09-28-2014, 09:05 AM
RE: Atwater Kent 84 question - by AI2V - 10-04-2014, 12:12 PM



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  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)