Using an 8YP4 in a Predicta (17DRP4) ?

[pallophotophone]

Originally Posted by bandersen

Hi guys,

Has anyone managed to rig up an 8YP4 so it can substitute for 17DRP4? I think that the only issue is the filament voltage. Maybe adding a few D-Cells to boost it?

P.S.

Anyone know where I can get a 5AXP4 ? I'm putting my workshop together and I had no idea these little test CRTs existed. They're awesome!

It won't work as the filament is fed AC. I'd just use an outboard 6.3 volt transformer or dc power supply. It'll be fine with either AC or DC feeding the filament.
And if the set uses a series filament string (that is to say the set doesn't have a power transformer),you'll have to complete the string to maintain filament voltage to the other filaments.

Best !

Bob Hodge