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i never used a resistor when changing seleniums to 1n4007 diodes. but what i did do was changed the value of the 37 ohm resistor thats on one side of the ac. the 37 ohm resistor is part of the ballast but you can leave it if you have a glass ballast and want to leave it original or clip the wires to the 37 ohm and put a separate one like i did , i used a 50 ohm 10 watt instead of the 37 which was only for the inrush to protect the seleniums but it holds alittle back on the ac when the line is at 121v where it used to be 117v back in the day. either way it will work with or without resistors for the diode change.
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