Bertan CRT test set CRT-30

[madlabs]

Hi All,

Picked up this beast for free. It appears to work, the displays come up and respond to the pots and the HV is working. I had some fun pulling some pretty mean arcs with it. Sadly, the filamant voltage doesn't go down quite low enough to test the 2v filament tube I want to test.

So, can I whip up a 2V filament supply, tie the grounds together and use it to test a 21EAP4? And since unlike most testers it is a manual set up, where/how can I figure out the settings? I looked and can't seem to find a manual for this beast but I think all I really need to know is the correct voltages to set it at.

Thanks!

Jonathan