Tube tester for a Predicta 21EAP4

[Eric H]

Hi Rick, welcome to VK.

The 465 should be able to test that tube, with the color adapter removed the socket on the 465 will fit the older B&W tubes like the 10BP4 so you could use the diagram of that tube to figure out the pinout of the tester and apply it to the Predicta tube.

I know the 465 uses a specific Cutoff voltage for different tubes, I have a 466 and the settings for 95% of the B&W tubes are the same but it does not work the same way as the 465, it also has an A & B socket, possibly the same adapter as used by the 465.
Someone here is bound to have a 465 and will be able to tell you what settings to use.

I would caution that tube has an odd heater voltage of 2.35 volts so if you do get it hooked up be sure the voltage is set right first.

Collectively our experiences here with the original Predicta tubes is that they are more often bad than not, hopefully yours will be the exception.