Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
Neomys Sapiens:
--- Quote from: TERRA Operative on June 26, 2022, 01:27:34 pm ---
--- Quote from: Vince on June 26, 2022, 01:20:51 pm ---
- An 84LS chip. Yes 84 not 74. Sure knew about the 54 military prefix, but 84 no, never heard of that one. Some more Googling required again...
--- End quote ---
Interesting. I know of the 64xx series that were a Texas Instruments Industrial Grade (−40 °C to +85 °C) that sat in between the standard 74xx and the milspec 54xx. It was only around for a short while.
Sometimes you'll find earlier versions of TTL logic that would have different numbers depending on the manufacturer before it was all standardised to 74 and 54 prefixes.
[EDIT] It seems that 84xx was also used for Industrial Grade parts in Europe. (−25 °C to +85 °C)
--- End quote ---
At least at TI, all the 55/75 types fell under the Interface category and were listed in a separate databook.
bd139:
Oh Tektronix you make me so happy...
Vince:
--- Quote from: bd139 on June 26, 2022, 04:37:12 pm ---Oh Tektronix you make me so happy...
--- End quote ---
So you mean the fault will be diagnosed within the hour, is that what you imply ?! >:D
Clock is ticking....
bd139:
Nah put it away now. Really have to move house now. This was a welcome distraction :-DD
Vince:
--- Quote from: Specmaster on June 26, 2022, 04:15:25 pm ---
--- Quote from: Vince on June 26, 2022, 11:30:10 am ---
So yeah, I HATE those trimmers too ! :-DD
--- End quote ---
Sounds like someone has been guilty of using the wrong type of contact cleaner on those.
--- End quote ---
Having torn the scope apart back then to restore it, I sincerely doubt this scope has ever seen any kind of servicing in its life... and trimmers should not be cleaned anyway, they aren't pot on the front panel. You set them once at the factory, maybe tweak them once if the scope is lucky to ever be calibrated again in its life, and that's about it.
To me it felt simply like the plastic aged, helped with the heat, and since the plastic shaft was so thin, 45 years later it didn't need much help to snap...just the weight of the knob (the boards are mounted vertically, plus the shipping bouncing it around... that was plenty enough I think..
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