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love those he ne's

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as i'm moving i've been going thru stuff as usual. lit up an old red tube. beautiful!. i have a nice naked green tube i bought from dave a long time back. it needed a ballast resistor at both ends. the + one i have and it's 10k ohms.
the one for the - end i can't find. any idea what value i need. i'd love to light this one up.

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