11-30-2022, 07:08 PM
The PM speaker will require a power resistor to substitute for the field coil. The OEM speaker is also equipped with a hum bucking coil, to use a PM an additional 20% in capacity should be added to the "filter output condenser". Same OEM field coil speaker also has the output transformer for the'42's. Even with a PM speaker the output transformer is required.
You may find the info here helpful to determine the correct output transformer...
http://www.radioremembered.org/outimp.htm
Might also want to check the Push/Pull input transformer that feeds the '42's. That, could have an open winding too.
GL
Chas
You may find the info here helpful to determine the correct output transformer...
http://www.radioremembered.org/outimp.htm
Might also want to check the Push/Pull input transformer that feeds the '42's. That, could have an open winding too.
GL
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
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