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  • #61
    I was lucky that my new coil stated on it 12 volts Internal Resistance. 4.9 ohms..

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    • #62
      Originally posted by Mrs K Corbin View Post
      OK dumb question. How do you tell the difference between internally and externally ballasted?
      As Jack said, some (few!) coils have these values written onto them. Most of the the time, you have to use your ohmmeter like shown above to know about this. Anyway, I like to check them systematically to be sure of their condition. This applies to resistors too, as 60 years old ones are mostly out of the initial range.
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