Hi Andy,
I will try to help you with some of your questions:
Especially, can the PSU be bench-tested separately, or will there
be unexpected effects (underload)?
You will have an unexpected effect - it won't work. The AC for the
power supply, as well as its filament supply, comes from the 555.
I am aware that I will probably need to take out and
reform all the lytics....
No reason to do this, these do not give a problem.
What happens if I operate the unit with only one vertical, or only
one
horizontal, or one only each...? Don't want to switch on and fry
everything in one session :)
Should be no problem, one beam will be weird but no damage.
Oh, and BAMA does not have any 21A/22A schematics... oh well
again...
These are in the 555 manual. Get the correct manual.
And finally... what ARE the differences between different serial
numbers of the PSU? It is often claimed they are not
interchangeable... why?
Different serial number ranges used different AC wiring. Best to use
the PSU that came with the scope originally. Same with the 551.
Larry Christopher
www.theoscilloscopestore.com
Home of The Fridge!
