[Dacious]

If you don't like the gnarly Neil Young sound (and there's nothing wrong with it if you do) use a 12AY7 in the first slot. I have some Raytheon 6072s and they are stellar, but the EHs AY7s also don't sound half bad.

The 'Paul C' mod to the phase inverter keeps the amp a little cleaner 1-2 points higher up the scale and possibly lets it put out a little more power - only a little. Still sounds great and you can hear barely restrained sonic mayhem. Seems to improve the touch sensitivity slightly.

Don't run the heater to ground like Leo did - keep it separate and use the twin 100-watt fake-centretap to reduce the heater 'bbuzzzzzzzz'.

I ground the pot backs and jacks to the ground rail on the board and then to a transformer bolt and have no noise issues. I don't use insulated pots or jacks.