Hi Mark and thank you for your advice.
Any components from Mouser shall probably have to wait until I next go to Europe, as unfortunately the postal services here simply cannot be trusted to deliver any international item. Quality components such as low ESR caps are extremely difficult to find in Brazil so my goal is to just get the scope back to a working condition. I have repaired various of this series, which have always been just fairly simple component replacement. By the tme this one is back up and running I shall certainly have a much deeper understanding on analogue scope repair. :)
Anyway, CR1767 is fine although VR1726 is indeed open. So that is progress.
I have been primarily looking for shorted tantalums and diodes, and mainly on the A6 Interface board. So far, I have found three or four but seem to have run out of tantalums to test on that board.
On the A10 Storage board however, I do find that across certain caps it reads short, only for the caps to test good with one leg removed, although across the traces still reads short. C1846 being one of these.
@ Harvey...
It has been on my mind that perhaps there is a bridge rectifier issue because some of the readings are not as they were, and they are not consistent across all rectifiers. I have just been putting it down to something further along being shorted, however I shall have a deeper look just to clarify. It would be nice to remove the rectifiers but it was such a ball-ache changing the ones I replaced that I must say, it doesn't really fill me with desire to do it again.
There was a video I saw where the tech just used a pair of pliers to literally twist the rectifier off the board before desoldering the remaining legs/pins, it's just I can no longer find the vid and don't want to risk destroying the A6 board...
As for ESR testers, I have an MK 328 which stopped working this week. Having said that I found an old Wayne Kerr 4225 ESR/LCR tester yesterday in a junk shop for under 20 USD. It switches on and a quick look inside shows it's complete, so once I clean the contacts which hold the components under test, I'll give it a spin.
Need to head into town for components.
James55