Hi my old Cuban friend. (And it is no Havana. LOL). I've noticed your photo on LinkedIn so I sent you a LinkedIn message. I'm not a real fan of LinkedIn or for that matter FaceBook but I always want to keep in touch with friends.

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According to my service manual, you are supposed to use much better equipment than a standard DMM. Also you need a good waveform generator and other expensive equipment to calibrate a scope correctly.

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Amendar , I must disappoint you. I just downloaded the Servicemanual for your Oscilloscope on Elektrotanya.com. (July 1975 version, 291 pages).
It seems that your oscilloscope doesn't use any microprocessor or pc controller board like the later Tektronix Scopes do. And therefore that option isn't available for your scope. Just as the Self Cal or Self Diag probably will not be possible on your 465 Tektronix either. And even the Schematics and Diagrams in the 465 Service manual seem to be completely drawn by hand, instead of made with the help of modern Personal Computers and/or Designing Software. Sorry !

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Hi Mark, the Oscilloscope was defect at the Diode Bridge, the mentioned PMI DAC10, and of course the Primary Fuse. So there were 3 defective components that I had to replace.
What component was the first to go out of order, or went defect, I'm not sure. But after the Diode Bridge was replaced the Fuse short circuit already was gone and all (+ and -) 5, 8, 15 voltages , and the 10V REF measured exactly their values without any load attached (J102 and J166 open). Except the 3 voltages that without load were higher as mentioned in the article.
You are very right that these devices are still worth kept working, no matter how many years they have had. They were at the time they were built top of the Bill and even today can compete with todays equipment! Especially because off the high RF/HF frequenties they can handle.
About your Russian Galvanometer, I have one also but when I after many years opened the Aluminium Box to have a look at it again, I noticed that the special cushioning inside had damaged the front of the meter because of the chemical substance in it. (somekind of sulfuric acid). So beware of the material in which your device is packed. My meter was okay but the text on the Aluminium Front was a little damaged.

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I'm sorry dear Amendar, I only know about the 2440 and the 2465A Tektronix Oscilloscopes. I think you can find it in the Service Manual of your Tektronix Scope, like I did find it in mine. I do not know if your 465 or 475 Document is obtainable for free on the internet. But if they at Tektronix did a as good a job with your Oscilloscope like they did with mine it must be explained in there!

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I think however you do Robert. Because you would only need to connect several Voltages up to 20 Volt that you exactly measured and adjusted with a standard Universal Multimeter. And you just Calibrate your Tektronix with these Voltages by using the EXT Diag and EXT CAL functions thats Built-In every Tektronix Oscilloscope. And maybe a few Calibration tests more.
But the best part is that you don't need to if the also Built-in SELF Cal and SELF Diag functions manage to do that for you automatically!
If you see Final part #4 of the 2440 Oscilloscope Repair you will understand. You only have to follow the very clear instructions in the Service Manual to be sure how to do that if you would use the EXT Calibrating modes.

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