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Various Ballasts
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Here's a closeup of some various ballasts that I got today. The two GE Bonuslines on the bottom were from Restore, the bottom one is a two lamp F40 ballast that dates to Sep '74 (code JK) while the other one is a F48T12/VHO ballast that I couldn't find a date code on though.
The ballasts on the top are new and are two GE F14-15-20 chokes from I think Dec '09 (code 50 2009) and a Philips Advance two lamp F40 ballast from I think Dec '09.
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Your F40 ballast is indeed from 9/74! Your guess on the chokes makes sense too.
It's kind of interesting that they were also CSA certified too...
Can you tell us the date code of the Advance ballast? Maybe I can fine tune to translate.
The Canadian ones don't even sell any preheat ballasts...they sell HPF F20 trigger starts instead.
I know the single-lamp choke preheat wiring scheme off the top of my head and I could probably do a rapid start if I had to...(without looking) I think it's yellow and yellow to one end of one side, one blue and one red to the other side of that lamp and one blue and one red to the other lamp and then the other end tied to the other lamp on the yellow side...am I right?