A Simple, Valve Curve Plotter

[SurreyNick]

After all the debate I have, in fact, backed off a bit and opted for something a bit 'rough and ready'. The design has no real safeguards for the valve under test, but because the unit is intended for my personal use and I am the designer I ought to know what procedure to follow when using it so I deemed it a reasonable risk. I also went away from using regulators to get perfectly smooth supplies. I thought I would initially have a go without them and see how the unit performs. They can always be added in if necessary. I have also persisted with using wire-wound potentiometers to adjust the various circuits. It's an experimental unit and I believe it's worth seeing how it performs with this rough and ready approach.

I've drawn a circuit and made an illustration of the enclosure front panel, both of which are attached. I'm not sure I have got the circuit right though. I was going 'line blind' by the end and fatigue had well and truly set in. If you spot any mistakes do please shout

I'll return to it in a day or two to make any corrections.

Nick