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Does anybody know what the output DC current is on a Motorola HPN3000A base
station power supply? DC voltage measures 15 VDC.

I'm not sure what the current capability is, but I can tell you
that Motorola DC supplies typically run a bit high for voltage (though
15 seems higher than normal, even for Mother 'M.' How accurate is your
meter?)

The pass transistors are two M9639 transistors in TO-3 case. I have not been
able to find a data sheet on these guys. Anybody have any info on them?

Try cross-referencing from the number 48-869639. I just did so,
and found that the equivalent is a 2N3772.

Further digging on that number reveals that it is a 20A 60V NPN
power device (no surprise). Specs are at this link:

http://www.onsemi.com/site/products/...2N3772,00.html

Assuming that the pass devices are in parallel, I would assume
that you have at least a 20A capable supply. You can, however, call
1800-422-4210, follow the prompts to get to Parts Identification, give
them the HPN number, and ask what the current rating is. They should be
able to tell you, and could also probably provide the part number for a
manual for the unit (which you can then order with a credit card).

Happy hunting.

--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
(Known to some as Bruce Lane, ARS KC7GR,
kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
"If Salvador Dali had owned a computer, would it have been equipped
with surreal ports?"