Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Restored Philco 46-420 code 121 has slight low pitch hum.
#22

Do you have a Field Coil speaker or a PM?
If it is the FC speaker, the schematic shows no bucking coil. I wonder.....
If you plug 500 Ohm 10W (for the test could be 5W) resistor instead the field coil, and use a PM speaker - would the hum disappear?

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.


Messages In This Thread
RE: Restored Philco 46-420 code 121 has slight low pitch hum. - by morzh - 03-19-2019, 02:32 PM



Users browsing this thread: 1 Guest(s)