Jackson 637 Dynamic Tube Tester

[edison64]

Hello: sorry if this is the wrong forum to put this, but it doesnt fit any whwer else.
I am in urgent need of a schematic for a JACKSON MOD# 637 dynamic tube tester. I have used this tester for about 15 years, it's like new. the problem is, it stoped testing tubes, no heater voltage, only on some tubes, then nearly all tubes. but heater v ok on all sockets and trans. cleaned all push buttons, still the same,weird ??? any ideas? its really packed and cramped on space so a schematic is a must. any updated tube data would also be great. thanks for your help.

[ChrisW6ATV]

If you have heater voltage at the socket (with a multimeter probe) but the tube doesn't light up, it sounds as if the socket contacts are loose. I have a B&K 667 tube tester with that problem.

[ChrisW6ATV]

Here is a site that lists the manual and schematic for your tester, and also test data:

http://www.agtannenbaum.com/j_cat.html

[edison64]

Thanks Chris, I checked his site, many times, !!!! cant beleive I missed it.

[refill233]

I have one for a Jackson 637 that is stained up some . I copied it below if you can use it.

Don

[uptown1]

I'm in need of this Jackson 637 manual as well.
I realize this is an old post but I'm hoping someone can post it here again.
Thanks,
Mauro

[edison64]

I should be able to send you a scan can you send me an email through the PM

[ChrisW6ATV]

Here is a fixed link to the site I posted four years ago:

http://agtannenbaum.com/j_cat.htm

[uptown1]

PM sent.
Thanks.