Merlin's heater wiring scheme.

[Structo]

I am also a Teflon wire convert.

If you mod or tweak your amp much, every time you enter the chassis with a soldering iron you are at
risk of burning insulation on PVC or similar wire.

I generally install the socket with the gap between the 1 and 9 pin towards the rear of the chassis.

This helps in two ways, it's easier to swap tubes when you can see the gap between the 1 and 9.
On a Marshall style amp which is tubes up, then it probably doesn't matter.

Also if you want to wire the heaters ala Marshall then it provides the gap to run the 4 and 5 wire across the socket.

On Dumble amps there is a lot on the back panel so most go with the overhead Fender style of wiring.

I run heavier wire on the power tubes and smaller on the preamp.

I twist the wire with a drill, not too tight!
Then cut and bend the wire to fit the amp.

[MakerDP]

If you are already re-orienting the sockets, why not do the Soldano heater technique of a bus wire down each side?

+1.

Twisting heater wires is for people with too much time on their hands.

I don't twist anymore. What a pain. I just do the SLO method but I don't use buss wire, I just use the same wire I used to twist. More important that signal wires cross heater wires above and at 90* angles than anything else.

Twisting does look nice though.

[Structo]

Pertaining to the Marshall method, that's why the heater wire crosses the socket to pin 9 with that style of wiring.

[trobbins]

But the sockets don't have spigots for shielding assistance with hum??