On Mon, Jan 29, 2024 at 10:15 PM, Jim Adney wrote:
1) The actual sampling is done by a bridge of 4 very special diodes. The parts
list says that each bridge is made of 2 matched pairs, and I can see a tiny
paint dot on each diode, with 2 different colors in each of this 3S76's
sampling diode bridges. Which diode pairs in the bridge need to be matched?
That's an easy one. It's described in the Maintenance section, page 5-2 of my 3T77 manual.
So "left" pair is matched and "right" pair is matched.
In later sampling heads like the S-2 the "right" pair was replaced by a matched pair RC networks, so only the "left" diodes were matched.
Anyway a slight mismatch will not prevent the unit to function normally.
Albert
