Nick, there's potentially a grid bias battery shorting problem with the bias pot arrangement, the switch (6) might be problematic in the position shown, a D.P.S.T switch would be better to switch the HT + and the LT +.
That aside you should be able to plot anode/plate characteristics with it, once you have a series of plots then other things can be worked out, Ra, ma/v etc.
You might already have this but if not here's a link to Langford Smiths article on the subject:
http://www.paleoelectronics.com/RDH4/CHAPTR02.PDF
Here's a link to The Radiotron Designers Handbook (the source of the above article) From this link you can get to various other chapters easy enough:
http://www.paleoelectronics.com/RDH4/
This post might or might not cross with someone's
Lawrence. EDIT: You could use a higher value for the grid bias pot (10) and possibly for the anode supply pot (5)
That aside you should be able to plot anode/plate characteristics with it, once you have a series of plots then other things can be worked out, Ra, ma/v etc.
You might already have this but if not here's a link to Langford Smiths article on the subject:
http://www.paleoelectronics.com/RDH4/CHAPTR02.PDF
Here's a link to The Radiotron Designers Handbook (the source of the above article) From this link you can get to various other chapters easy enough:
http://www.paleoelectronics.com/RDH4/
This post might or might not cross with someone's
Lawrence. EDIT: You could use a higher value for the grid bias pot (10) and possibly for the anode supply pot (5)
