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Rather than use the wiring on the board for the heaters, the transformer I speced has three separate 6.3V windings on it.
So I bent up the pins for the heaters (2 and 7 for the rectifier, 7 and 8 for the 6SL7) and flew a piece of 16 Gauge solid copper wire up to them over the top of the PCB. These pins have no contact with the PCB.
A voltage divider of 2 resistors comes off the end of the heater wiring and is referenced to signal ground, because the entire board does not run at 0V ground, but is elevated to float the cathodes/heaters nearer to plate voltage. It grounds at the ground pin of J2, one of the input jacks.
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