Old metrix Wobulator now buttonned up and off the bench. Spent a whole day working on the thing. Took my time to tape together all the bits of the jigsaw schematics, and had a go at the thing. Checked power supplies and other things, found numerous problems. Verdict is that it's a rabbit hole that could easily prove to be extremely time consuming and costly parts wise as well (tubes and caps), and I would never be able to get any ROI nor even break even. Financially and practically, makes zero sense to try to fix it from what I saw. So, it will be sold as is. Put it up for sale today, already 20 people were curious enough to click on my ad to see what's inside... there is a market ^^
Anyway, bench now free for the next repair : my 453 portable vintage Tek scope with a failed CRT HV / no trace.
Will have a go at that one now.
From what you said the other day, there is a slight chance that the HV transformer might still be good. You said it was classical for this scope to have the circuitry on the secondary to overload the transformer and cause the HV to fail coming up. So first thing for me is to figure out if the transformer, oscillator or secondary circuitry are at fault.
So mùy question : I know squat about transformers so just in case I am about to do something stupid : since overloading the secondary can have repercussions on the primary and the oscillator itself... could there be problems if I disconnected all the circuitry from all the secondary windings of the transformers, to try to isolate the fault ??
I would think not but hey, who knows, I might learn something and better safe than sorry eh ?
If safe then will do that. Disconnect everything from the secondary windings and then see if the oscillator runs and if I get sensible voltage levels on all the secondaries.
Thanks in advance for your wisdom and experience...
Below the schematic for the CRT section to help...
Oscillator is made of 4 discrete NPN trannies, one of them in a big T03 package drives the primary of the transformer. Secondary has 4 rectifiers, 2 solid state and 2 vacuum tubes.
Have an HV probe for use with a DMM, so I can check any voltage anywhere on the secondary side, no problem.