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RE: Welding open filaments. I did that years ago back in the 80’s. I have had a few junkers with open filaments that whacking the tube would make it work for a while. I charged a 10mfd cap to 250 volts (no math here I had a 250 vdc regulated power supply and a 10mfd pigtail cap). Wired it up and whacked it! The tubes lasted for years after that. I do recall some color tube filaments being wired in series. I don’t remember what types…
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