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HP 1741A oscilloscope - restoration project

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timjimbaker:
I managed to fix the two broken contacts on the main time base switch. It is a bit tedious to get them just right. I got the spring steel from those stick on anti-theft tags that many stores put on their products. I think they are called "sensormatic" tags. Inside each one is two pieces of spring steel. One is a thicker gauge and it is pretty spot on the the gauge of the contacts. It is still thin enough to cut with a sharp razor blade. Far easier to cut out the shape of the contacts with that than a pair of snips... The spring steel in those sensormatic tags is real handy stuff. I always save those tags when I see them. Also, old windshield wipers have great spring steel in them for making small tools and the like... I grab that when I can too!

Best regards, Tim.

peterpan:

--- Quote from: mayeri on December 14, 2012, 06:10:26 pm ---Unfortunately, my another oscilloscope is broken too. 
EMG 1568/2A (2x50Mhz). Search it with Google, it is interesting look at him. This is one of products of an former, now defunct Hungarian electronics factory, it it called EMG.  Power supply also was defective, but I am still hunting for the fault because the electron beam is missing.
Do you know? I would not be so lucky…

--- End quote ---
Hello mayeri!
Look here :
http://elektrotanya.com/?q=hu/content/about-site
The site language is hungarian, but you can write in english, if it is easier for you
For example : http://elektrotanya.com/?q=hu/content/emg-15682-szkop-sokszorozo-aramkoerebe-kondenzatort-keresek-500pf15kv-megoldva

RacerX:

--- Quote from: lowimpedance on February 07, 2013, 11:13:05 pm ---
 
.
--- Quote ---Someone must have lubricated the time division switch with something they shouldn't have
--- End quote ---


The lube/GLUE like goop is whats left of the original HP lube used on these series of CRO's.
Does not age at all well as you have found, how ever its easily removed and new lube applied.
I have cleaned half a dozen of these series oscilloscopes with this 'glue issue', and none of them
had been touched since new.

--- End quote ---


Sorry to resurrect such an old thread, but I just stumbled across it and it is relevant to an issue I recently
encountered...

I have a HP 1725A scope and have cleaned the switch contacts of the petrified grease HP applied over
30 years ago.     However, since I did not have any on hand I did not re-apply any contact lubricant.

Should I be worried?   HP put it there for a reason...  am I going to quickly wear the gold plating away?
I plan to apply some Electrolube in the near future but this thing will be OK for some normal usage in
the meantime, yes?

tekfan:
I've heard that gold contacts have self lubricating properties. If you look at most multimeters there's no grease in the switches.

robrenz:
Caig Deoxit G100L is tough to beat on gold contacts.

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