Originally Posted by
Marcel
I'd have thought you'd build yourself a little tube tester in a die cast box to confirm or deny your tubes, but I suppose the Baja pedal does the same thing.
As most measurements would be DC based they can be pretty simple fixed resistor units with banana sockets for metering points. A fixed self bias for the smaller tubes maybe with a optional capacitive audio in/out is easy to implement, Larger tubes are an issue for current draw and fixed bias but it's not beyond the realms of possibility if you use reasonable sized VA transformers.
On the subject of transformers I am considering a purgatory pedal build powered by a 12VAC plug pack and having a 240:12V 3VA transformer to create the HT which I calculate should be plenty for one 12AX7, so using similar for a test box should be easy.