Tube tester for a Predicta 21EAP4

[rickfray]

Eric, It's not the settings I'm worried about, it's whether I can find the right adapter. The socket connected to the 465 via the cable has 12 pins, but the 21EAP4 only has 5 pins on a 5/8" round plug and they aren't in a circle like most of the adapters I've seen. If I could see a picture of the "A" socket holes, I'd know for certain if that's the one.

As an alternative option, what CRT testers have Predicta restorers used to test a 21EAP4? Thanks

Rick

[marty59]

Originally Posted by rickfray

Eric, It's not the settings I'm worried about, it's whether I can find the right adapter. The socket connected to the 465 via the cable has 12 pins, but the 21EAP4 only has 5 pins on a 5/8" round plug and they aren't in a circle like most of the adapters I've seen. If I could see a picture of the "A" socket holes, I'd know for certain if that's the one.

As an alternative option, what CRT testers have Predicta restorers used to test a 21EAP4? Thanks

Rick

You can "test" with just about any tester, rejuvinating opinions/options will vary and that Predicta tube is delicate.

Like tube testers, you can't have just one!

[Eric H]

Here are some pictures of the A & B sockets from my 466, it's probably the same as the one for the 465 since the 12 pin socket is the same, I don't remember which one is used for the 21EAP4 off hand but I can look it up.

Even though there are 12 pins in the tester socket I believe only 5 of them are used, 2 for the heater, G1, G2, and Cathode (K).

In any case I wouldn't rejuvenate a Predicta CRT (or much else) with a 465 or a 466, they are just brute force blasting, probably a 470 is the earliest B&K with a decent rejuvenation system.
They are fine for testing though.

[rickfray]

Thanks for the pictures Eric, but the brightness makes it hard to tell. The BK 465 setup guide sais the 21EAP4 should use the "A" socket, but the your "socka" pic doesn't look like the plug. There needs to be a pin hole in the middle of 4 other pins. The schematic for adapter "A" shows an 8 pin socket but only 6 holes are wired up so that's confusing also. I'm adding pictures below of the actual tube connector and jack on the circuit board. The plug is about 5/8" in diameter.