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Philco Model 66 120hz hum in speaker
#16

Well, I have discovered that the choke is probably the issue after all. Why, because what I thought was a new Stancor C-1709 does not measure, resistance or inductance, as is should. So some other type of new choke was in the box. I probably should have verified its inductance before I used it, so lesson learned here. And, as Morzh pointed out, even if it was the correct choke in the box, the C-1709 is too small. So, I'm going to search for a choke with specs as close to the Philco part as possible, and add a resistor in series if needed.
#17

If you find a Thordarson Meissner cross referenced part number, be sure and let us know - I have a slew of their parts.
Dan
#18

The choke has 10mA rating, so doesn't have to be large to have 50H. But even if it 30H is ok.

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.




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