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Recent content by litterbox99

  1. litterbox99

    Siemens LGR 7641 specs

    Siemens LGR 7641 tube specs. A few years ago I purchased a HeNe tube & power supply kit. It came with a Siemens 7641 tube, un-marked power brick (3 1/4 x 1 1/4 x 3/4) and three 20k 3W metal oxide ballast resistors. I powered it with a variable power supply (YH-305D) @ 12 vdc This set up has...
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