Thanks guys, I ordered the MC1458P from Mouser. I should be all set in
a few days when it arrives. I did notice something cool however.

I'm half tempted to try this because I'm anxious to see it work again
and know that I got everything. I'd hate to still have more bad parts
that I have not yet found.

The Op Amp is a DUAL chip. In the schematic it's clearly using the 2nd
amp and the first side seems to be just sitting there. I bet I could
re-wire my current chip to work if I just utilize pins 1, 2, 3 instead
of the 5,6,7 that it is using now.

I'm very tempted to try this. I will still need to use pins 4 and 8
for the Vcc + / - , but as long as those 2 pins are ok, my idea seems
sound that I could just use the other side of the chip *lol*

Your comments are most appreciated

-Chris

On Sat, 15 Nov 2003 02:32:57 +0000 (UTC), Jim Yanik
wrote:
chris1@oupower_dot_com (Chris) wrote in
. com:

Hey guys. I have finally found the bad part in my TEK 466 Scope. It is
the Op amp 156-0158-00 Mini-DIP, Motorola, Op Amp, MC1458P1 it says
RCA 827 at the bottom.

Any idea if I can swap this out with one from Radio Shack? Or does it
have to be a Tektronix one of identical make?

If I can swap it, can someone tell me what 8 pin Op Amp model I can
use instead of this one? And will it affect calibration or should it
be ok? -It's the op amp off of the +15v power supply schematic on my
466 scope.

Thank You,
-Chris

I would not substitute other IC types,you can use a generic 1458,dunno if
RS has them.As another has posted,the 1458 is still available,and
inexpensive.

--
Jim Yanik,NRA member
jyanik-at-kua.net