On Fri, Aug 9, 2019 at 09:25 AM, Paul Amaranth wrote:
I haven't opened up a 577, but those are likely the typical Sprague capacitors
used by Tektronix in that era. They may still be good; I'd check them with a
good capacitor and esr meter before removing them.
If you need to replace them, the neatest repair is one I use in 4xx and 7K
scopes - use
a small carrier board to mate the footprint to a commonly available snapcap.
This
provides the jumpers that Tek used and the footprint for the new cap. Use
105C caps as replacements. You can find these on ebay and there are gerbers
floating
around if you want to send them to a board house yourself. You can also etch
them
yourself of course.
Some purists might restuff the cans with a new snapcap.
Paul
Paul,
I have become quite adept at re-stuffing cans with modern capacitors. I "restuffed" all the filter caps in my TYPE 576 power supply with modern caps. Having previously just replaced these large cans with modern caps, there is something about the "look" of those large cans that is satisfying, in a way that small and modern caps just cannot replicate. With me, it is not so much being a purist, just about scale, symmetry and general appearance that drives me to do this. I appreciate your insight and advice regarding this problem.
--
Michael Lynch
Dardanelle, AR
Mlynch001