Analog Scope Vertical Drift

[GK]

I think replacing the caps is about as far as I'll go with this thing. It's not a huge deal that the trace wanders away, as long as the thing still works. I'm actually going to get a Rigol DS1052E soon, which I'll use for actual measurements.

Since I can't find all the right value caps, how close is 'close enough' for the HV rectifier circuit?

If you can replace all of the old electros and actually establish that the regulated supply rails are within specification and stable then you are pretty much 95% of the way there.

As for the uF values of psu caps, one size up (or even more) generally isn't a problem at all and almost always preferable than going less in value.
 

[rexxar]

I think replacing the caps is about as far as I'll go with this thing. It's not a huge deal that the trace wanders away, as long as the thing still works. I'm actually going to get a Rigol DS1052E soon, which I'll use for actual measurements.

Since I can't find all the right value caps, how close is 'close enough' for the HV rectifier circuit?

If you can replace all of the old electros and actually establish that the regulated supply rails are within specification and stable then you are pretty much 95% of the way there.

Oh, that's another thing. How can I probe the HV stuff without blowing up my cheap DMM? I think the highest rail is 2kV

[vk6zgo]

Some of the older 'scopes had a voltage divider off the EHT,so you could read a lower voltage proportional to the high one.

The test point was marked "HV test" or something like that.