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"I noticed that the signal input is not referenced to ground in any way"

In the schematic it's (should be) directly referenced to gnd because it's automatically assumed by any experienced tech that the signal input would go between the top and bottom of the input pot.

The schematic drawer has just been sloppy, or trying to be smart. Connect the gnd end of the input RCA to the gnd buss.
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If you are using a big thick buss wire, can you give us the sequence that the grounds attach to it with reference to the schematic.

ideally, the input RCA gnd, the bottom of the pot and the mess of stuff hanging off the cathode of the first triode should be right at one end - and the center tap of the two traffo windings RIGHT at the other end. Near to the taps should be the gnds of the PS filter caps, with the caps etc off the output tubes cathodes between these two ends.

If you haven't got it like that - and if grounding the input signal doesn't solve it - then it's rewire time!

And as someone else pointed out, there is typo in that circuit. IMO, if the PR merchant had the time to mention it in his blurb, he would have had time to fix the schematic - more sloppyness!

But a comment - it's a crazily complex circuit for a nubee, someone very recently posted in this forum basically the same circuit but WITHOUT all the added BS hung off the cathodes, and that's what I'd suggest for a early project.

Regards, Allen

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