On 3/5/2014 10:38 PM, Tom Miller wrote:

"amdx" wrote in message
...
On 3/5/2014 6:26 PM, Tom Miller wrote:

wrote in message
...
"hanging by their leads which might only be .040" in diameter, "

HAHA.. what a mistake. Really, forty thousandths ? Try more like
fourteen...

LOL

Just a few comments:

1) The original circuit used bipolar NPN transistors in the hybrid. You
might consider using some high voltage video driver transistors for your
design.

That works for me.


2) The circuit is not driving the deflection plates directly. They are
driving a delay line with taps that connect to the deflection plates.

Only going by what I see on the schematic*, but the delay line are
back two stages before the plates.

This is so the deflection signal follows, in time, the electron beam as
it moves through the deflection plate assembly.

My thinking is the delay allows you to see the triggering event,
but it is a wag on my part.



*The OP has intimated that my schematic is not correct, but I want
him to
reinforce that, as of now I'm going with, it is correct.
Mikek



No, the delay line for the deflection plates is inside the tube,
parallel to the segmented plates. Its purpose is to align the
instantaneous deflection voltage with the moving electron beam. Just for
the learning experience why don't you calculate the speed of the beam as
it passes from the beginning to the end of the vertical deflection
plates. remember it is in a vacuum i.e. ideal.

The delay line you speak of is usually a coil of coax and does exactly
what you said. It lets you see the beginning of an event after the trigger.

The schematic is correct.

tm

He has not said that he sees the 165ohm resistors-- yet. Once he does,
then I'll feel more confident that I have the schematic of his circuit.
I'll also remind him to check for the open resistor (R26) to the -15
volt line, I saw someone had that defect.
Mikek