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Maybe it's just me, but I think there is a lot of angst and anxiety about horizontal output tube cathode current. I'd just set the linearity coil for minimum current, and if the width, linearity, and HV are correct I'd just leave it and run the set, unless the current is just too much, say 250mA or more. I personally can't believe there is much difference between running it at 210mA vs 205mA, for example, as far as tube or flyback transformer life.
Also, from what I see, the 6JS6 and 6JE6 tubes are just a repackaged 6DQ5 at least from what I see in the specs in the tube manuals, but later sets did run the tubes harder to get more HV and drive the 90° rectangular CRTs.
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Erich Loepke
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