On Fri, Apr 9, 2021 at 01:46 AM, Stephen wrote:
When I look at the data sheet for the MJE2801 (Q1534,Q1546, Q1566), it has
exactly the same pinout as the TIP35C I used.
However, now that I have a better and clearer view of the board layout,
(thanks to the different links), I realize that, although the part number used
by Tekronix is replaceable by an MJE2801, the board silkscreen says that the
Base and Emitter are reversed from what I see on the data sheet... I
couldn¡¯t clearly see that before, not even on my unit.
That will definitely need to be addressed.
Can someone double check and confirm? It¡¯s a bit confusing...
You are correct, Stephen, they are reversed. My parts donor board contains an MJE2801. Its base and emitter are reversed in comparison with the TIP35. The emitters on the board are closer to the rectifier/buffer part of the mainboard, the bases are closer to the HV section.
Raymond
Raymond Domp Frank