In article ,
. says...

Considering how longlasting and popular the 465 is,that's not a very smart
sentence.The same HF and LF cam switches were also used in the high-
performance 7000 series lab scopes.


True enough in the case of the 465. That model in particular seems to
have been very robust. You don't see many owners asking about how to
clean 465 switches.

485 switches, though, are another thing entirely. It's very rare to see
a 485 whose vertical attenuator switches aren't noisy. Perhaps gold-pad
abrasion has caught up to the instruments over time; however, I'm
personally aware of at least two anecdotal cases of noisy 485 switches
being fixed (at least for the time being) with contact cleaner.

It's possible there's more than one cause of switch degradation at work
in the 485 and other notorious "problem children." Either way, though,
the original designers were clearly not omniscient in all cases, or the
problems with certain models wouldn't be as widespread as they are. I
wish there were a sure-fire way to fix the 485's front-end switches; it
was my favorite Tek scope of the bunch otherwise.

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------