Wayne wrote:


I've got a Fender '65 Twin thats got old GE paper electrolytics in
the B+ circuit. Most are 20uf @ 450 volts. I'm a relunctant to
replace those with NOS for the obvious reasons the NOS probably are
not gonna be an improvement over whats in there now.


Brand new ones will be fine. www.tubesandmore.com

Yours should have had 525-volt, since there's more than 450 volts on them.


First. Is it advisable to replace with something else, since
technology changes and this is 40 year old design.?


Sure.


Second, I'm having problems finding new replacements because of the
450v requirement.


450's are stocked about everywhere, like www.mouser.com. But you should
use a higher rating.


Third, should I also replace all those .1mfd and .047mfd while I'm at
it and with what?


Not if they're not causing a problem.


BTW, I'm really not interested in changing the "sound" of the Twin.
It's a great amp as is!!! Just wanting to clean up some of the hum,
etc.


Therefore you *should* replace the power supply filters; do the 50
that's in the bias supply too.



I can solder and do the light stuff, but I'm not an schooled in
electronics.


Since lethal voltages are present, don't even start this yourself. Take
it in to someone who won't get killed.