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The Ballast in my 21CT55 was good, (other than being rusty), measuring very close to the 800 and 430 Ohms. Actually it's just 2 high wattage resistors inside of a plug in unit, with a jumper between a couple of pins. If you can I'd just see if you could find a couple of 20-25 watt resistors and put them inside of the ballast, although I suppose space could be a problem. I painted mine with high temp silver paint for appearance.
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