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I believe G! and cathode are reversed on the Predicta tubes. I will need to confirm that for sure. You can tie the heater winding to the 6 volt winding without trouble, or add a 6 volt filament transformer. If you have an old 110 tube brightner, remove the autotransformer, connect the filament windings to the filament transformer, reverse G1 and cathode (pending confirmation), install a tube like a 21CEP4 and you're good. This way, the modification is totally reversible if you find an exact replacement.
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