...I hate wiring heaters.
I'm hoping having the heaters run perpendicular to most of the signal wiring + the correct approach to the sockets + an elevated humdinger should add up to no hum, but I guess we'll find out.
I probably should make a genuine elevation node for the heaters instead of just referencing the power tubes' cathodes, what with the DC cathode follower raising Vhk on v2b into dangerous territory.
Kind of moot until I can figure out where to put the bridge rectifier and the reservoir & screen supply caps.
The rest just falls into place though.