On 20 Nov 2005 04:34:45 -0800, "bdonovan1" wrote
in om:

Well, let me add or define this problem some. Amp on- transistor starts
getting real hot real quick and Will blow fuse.
Amp on and keyed, definate blown fuse. Checked biasing, all
resistors,diodes near and around problem transistor, all ok.


Don't just check the components -- physically test your base bias
current. If there is no series resistance at the base then at least
check the base voltage. And check -both- transistors (without keying
the amp, of course).


Removed
the transistor and power up amp, no problem. Have not keyed the amp in
this state so dont know if it would blow the fuse.


Don't. Assuming it's a push-pull amp (i.e, two transistors) you do
-=NOT=- want to key the amp with only one transistor.


Tested trans with
dvm in diode check, get readings from base to emitter and base to
collector no matter how the test leads are applyed.


Sounds like you checked them in-circuit. Won't work. You have to pull
the transistors in order to test them. Ideally, you should pull -both-
transistors and compare them to each other.


Ill be the first to
admit I am no tech, but it seems to me its shorted internaly some how.
As I say, Im no tech, just learning. Any help I can get I can sure use.
Thanks again, Bill


Since you little or no experience with these things, you should be
aware that ceramic RF transistors are made with Beryllium, a very
poisonous material. If the ceramic 'pill' is damaged in any way you
could be risking your health.

Just thought you should know.....









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