Second part of a two part series. In this video we finally identify what is making this otherwise simple single-ended amplifier hum so violently. It call comes down to a single connection.
One thing of note, in this video I blame the original wiring for the fault, but looking back on Part 1, you can clearly see the original wiring had the two screens and the 6SJ7 plate on the same node. So, I had obviously made a mistake in the rewire after the cap job!