A Simple, Valve Curve Plotter

[Mark Hennessy]

The rectified 6.3v secondary will supply the heater current and will include a potentiometer and voltmeter to allow adjustment from 0 to 6.3v and an ammeter to check the current is steady.

That's going to be quite a potentiometer - a large wire-wound job, I'd imagine. And it'll run fairly warm..

Might be worth considering a small variac ahead of a 240->6.3 transformer. Such a variac might be easier to source than a pot?

Otherwise, that all sounds reasonable to me (but remember that I know almost nothing about valves, so that means almost nothing )

Looking forward to seeing how it goes...

All the best,

Mark