"todd" wrote in message
oups.com...
Hello: Upon removing the case from my 2246 scope, the case snagged on
the heat sink of one of the transistors in the "VO Gain" section of
the main PC board (not the processor board), breaking the leads of
this transistor. The transistor is a round metallic 3-lead transistor
labelled " Motorola logo, 0846, 8641". It is one of a pair and has a
slip-on metallic heat sink attached. I have been unable to identify
or cross-reference this transistor, and would appreciate any help in
identifying (and hopefully obtaining) another pair of transistors.
Thank you in advance
Todd K4RR


-Go to http:\\groups.yahoo.com
-register
-subscribe the "TekScopes" group (copy and paste the name, there's a
group whith a similar name)
-when you can access it a search for Mr. Yanik's ref: 151-0846-00 finds
several threads.

some quotes:

" the Tek cross ref says these are 2N3866A NPN RF power transistors in a
TO-5/39 can, but this part does not work when installed in the scopes,
and the manuals say there is trouble with any transistor that does not
have the base connected to the case."

" These were a custom Tek mod of the standard part.
If you don't use the correct part you will have all sorts of problems
with
frequency response and oscillations as you move your hand or the cover
near
these parts (been there - done that)."


So it looks like you have to find an original...
Best Regards

Steve Sousa