Products > Test Equipment
HP 1741A oscilloscope - restoration project
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SeanB:
Roll pin........
tautech:

--- Quote from: tggzzz on August 30, 2014, 03:44:00 pm ---
--- Quote from: tautech on August 29, 2014, 11:27:18 pm ---A 1740 manual should be available from one of the links in the first thread in the Repair board.
HP used retaining screws that require very fine hex keys to remove the control knobs, you will need the correct sizes. (imperial)
Search other restoration threads as some senior members have unbelievable skills and tricks to do exactly what you need.

--- End quote ---
It came with the repair manual, I'm pleased to say, but it is silent on disassembling the knob.

I had a quick look a while ago, and couldn't be sure it was a hex screw; I wondered whether it was a foobar, where "foobar" is effectively an expanding coiled spring shaped like a very thick danish pastry :). Now, if only I could remember the real name for a "foobar".

Either way, I'll have another look, and thanks for your reply.

--- End quote ---
Just checked, they are definitely hex grub screws that hold the timebase knobs on.
2 sizes, 1/16 and 0.050.
the 1/16 is easy to acquire, the 50 thou not so easy.
Both sizes came in a cheap Fuller set #130-8030 metric & imperial to 10mm/3/8 that I have no hesitation to recommend for workshop/lab use.

tggzzz:

--- Quote from: SeanB on August 30, 2014, 04:34:08 pm ---Roll pin........

--- End quote ---
<sigh>Thanks!</sigh> :)
coppice:
I think the 1741A was the only really satisfactory analogue storage scope ever made. Their only big problem was premature failures of the tube. As long as it failed in under 90 days it was a warranty replacement, so HP paid the bill. If the tube failed out of warranty you threw the scope away. The tube was most of the cost of the scope.
David Hess:

--- Quote from: coppice on September 01, 2014, 10:51:23 am ---I think the 1741A was the only really satisfactory analogue storage scope ever made.
--- End quote ---

Why do you say this?  I really like some of the Tektronix analog storage oscilloscopes with the notable exceptions of the 464/466 and operating any of their variable persistence tubes in bistable storage mode.
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