CrustyTV wrote:Seriously tasty scope you've got yourself there Simon. Will look forward to you bringing it back to good health
Yes it is a big boys scope and I was expecting you to say that it is far too complicated for your workshop
I have begun diagnosis today.
I have powered it up and the tube is bright and as reported by the vendor there is something wrong with the timebase.
I have downloaded the 7B53A manual as a close guide for the 7B53B and it does not have an awful lot of differences.
Faults found so far are the time base only has three speeds with a little bit of variation on the settings in between the steps that work. There is a -50V supply that does not do much apart from feed a reference to the time base switching. I will have to get the covers off the frame and check it before I go in any further.
There is a bit of noise on the Y amps so capacitors in the power supply need to be checked too.
The scale lamps are not working so if these are NLA the old ones will have to be stuffed with LEDs.
The on screen display will also need to be looked at. There are little bits missing from the trace when the switch is on so some of the logic is working but not the character generator.