I was given a 2245 recently which of course doesn't work too well.
Investigation reveals that Q805 and Q806, in the horizontal right plate
output stage, are cold to the touch.
The service manual, section 6.2 (page 6-19) says,
The MOSFET output transistors (Q801 and Q802 left plate-- Q805 and
Q806 right plate) run hot. If either side is cold, it is defective.
So, that's me and now I need to find a couple of these VDMOS FETs, which
seem to have become quite rare.
They are Tek P/N,
151-1211 VN1316N2 N-Channel VDMOS FET, 160V, 250mA, 40 ohm
151-1212 VP0116N2 P-Channel VDMOS FET, 160V, 250mA, 25 ohm
Has anyone solved this problem with a modern replacement pair? and have
suggested substitutes? These are in TO-39 package which adds additional
challenge but I suppose TO-220 or equiv could be made to fit. Of course,
the real thing would be great too if there is a source.
Thanks for any leads!
Chris
--
Chris Elmquist
