[Heathkit] RE: Help with Heathkit IO-4510 O scope

[Murray Grandy]

Just getting back to working on subject scope. This is a classic example =
of "The more I find out, the less I know".  Received the exact =
replacement 3kv diodes (57-56) from Randy K8TMK. Thanks Randy for the =
diodes and the nice Heathkit catalog. As a few people suggested, these =
new diodes test the same as the old so, I guess they can not be checked =
the normal way.
To add to the confusion, I have on hand 2kv (NTE525) diodes that I =
purchased from Mouser sometime ago, and they test as usual on the two =
different DVM's diode test. How can there be such a difference between =
2kv diodes and 3kv diodes. But what is even more baffling is, the trace =
is on the scope without having the 3kv (PDA) lead connected. I =
discovered this by accident, checking the voltages and while reaching =
around the front of the scope looking for the on/off switch, there was =
the trace, and can be adjusted up down etc just like it was in it's =
right mind. So, just what is this 3kv supposed to do. It is connected to =
a large rubber type connector that plugs into the side of the CRT just =
like the old TV sets. I guess I will have to read the manual unless some =
kind soul out there will tell me.
Murray


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