"Arfa Daily" wrote in message
...


"Phil Allison" wrote in message
...

"Arfa Daily"
"Phil Allison"

"Arfa Daily has No Idea how STUPID he is,. "


A new pair of matched transistors had the offset down to a few mV, and
the protect circuit was happy with that. But it got me to wondering
what could be the failure mechanism that resulted in a transistor
still being a recognisable transistor in that the tester still saw it
as one, and it still basically worked in the amp, but had a very low
gain ?


** Obviously some kind of manufacturing defect in the particular
transistor - thousands of possibilities.

Think - wok too hot, not enough Soy or stale prawns in the chop suey.

Wot a ****ing IDIOT question.



Well then, what a ****ing idiot ****, as ever, you are to bother
replying


** 100% WRONG - you ****ing pommy ****.

Pointing out the dumb errors and sheer stupidity of others is a very
important, socially responsible task.



... Phil


No it isn't. You're just a picky wobble-eyed psycho who always feels that
he has to demonstrate his self importance and self-believed superiority.
You probably wouldn't suffer from these delusions if you just kept popping
your meds according to your psychiatrists instructions. Now if you've got
nothing more interesting to say, **** off back into the desert, and get
back to your other hobby of shagging kangaroos ...

Arfa

Don't know why, but see it fairly often. Seems like a preamp pair can
function with mismatched hFe up top a point but when the gain difference is
too great, DC offsets, sometimes intermittent, occur.

Just the other day had two relay drive transistors in a Marantz 2270 with an
hFe of 2. Don't know for sure how or why they failed, but I did notice black
tarnish on the leads. Perhaps migrated into the semi material?

Mark Z.