Hi all - long time lurker, first time poster.
I've just picked up a second-hand Tektronix 2235 100MHz scope to help me with troubleshooting guitar amp builds (multimeter alone isn't cutting it anymore). It has way more functionality than I'll ever need for this purpose but I got it for a good price.
It's in good working order as far as I can tell. I've run through most of the familiarisation procedures in the operators manual and it displays a good clear trace when hooked up to a cheapo function generator.
Given the age of the scope, the next step is to test the key internal voltages and check the power supply electrolytics with an ESR meter. Looking for advice on:
- Should I check all the electrolytics, or at least a sampling of them?
- What other components should be checked?
- Is it worth doing any preventative replacements other than out of spec caps?
I mostly subscribe to the "if it ain't broke don't fix it" philosophy, but unsure about the best approach with a device of this age.
I have the service manual and schematics, I know how to safely discharge capacitors and work on energised devices. Not planning on messing around with the CRT at this stage if I can avoid it.
I've found a few articles and threads on resurrecting dead devices but nothing to date on care and feeding of old scopes.
Any pointers would be greatly appreciated.