Emerson 571 Ballast Resistors
 

Has anyone tried to reproduce one of these? There are two 10 ohm and three 75 ohm resistors in it but I can't find their wattage anywhere in the documentation. It's only listed in the parts list as "Ballast Tube" and in the schematic by pin out and resistance.

If anyone would know, it would be bandersen. :D

He prob did a few of them. :yes:

No doubt. I know he's done similar ballasts for the Motorola VT-71 sets in fact, I copied his design when I restored mine.

Not yet, but I expect I will someday.

I'd conservatively estimate 250mA of current. Then it's current squared times resistance.

0.25 * 0.25 * 10 = 0.625 W
0.25 * 0.25 * 75 = 5W

I'd double those for a safety margin.
2W or 3W for the 10 ohm. 10W for the 75 ohms

Got it. Thank you so much.