Insides. The ballast looks like it might be a replacement. It appears to be wired for 240v as well. There is a faded, hard to read diagram on the door that mentions 120 and 240v wiring.
Does your ballast have notches on the corners....little grooves, it appears to have that...my LM has this design....also they had General Electric Capactiors....take it out look for numbers in WW-YY or YY-WW format....it's the week # and Year format....my guess this is a 1967 to 1969....
Dent is ok to my knowledge as long it doesn't have a hole...but I recommend when testing it, to use a GFCI outlet....and complete protection......also before screwing in lamp test the OCV voltage.....I'll help you with the ballast wiring when I get home....I'm in NYC as of now....
1. Yes the ballast has grooves on the side
2. Date code on GE Cap is 67-4
3. Ballast looks like it could be CWI - I don't see any electrical connection between the two coils.
Okay it's an original ballast dating to January or Feb 1967! Nice find......I will see how you can connect for 120 volt.........but both coils are isolated.....most older cobraheads were actually CWI instead of CWA!
Hmm, my Sylvania lamp bulletin says that CWI ballasts have better lamp regulation and have the lamp outputs isolated from the line. The disadvantages of this is that their losses are higher and the ballast costs more.
CWI is indeed popular in up here, our electrical code requires them on voltages with line-line connections such as 208, 240V etc.
Dent is ok to my knowledge as long it doesn't have a hole...but I recommend when testing it, to use a GFCI outlet....and complete protection......also before screwing in lamp test the OCV voltage.....I'll help you with the ballast wiring when I get home....I'm in NYC as of now....
@ Jace, really, I was in NJ earlier this week.
2. Date code on GE Cap is 67-4
3. Ballast looks like it could be CWI - I don't see any electrical connection between the two coils.
CWI is indeed popular in up here, our electrical code requires them on voltages with line-line connections such as 208, 240V etc.