2. amps-preamps
  3. 1303939400

when do you replace capacitors?

I have read that capacitors last around 20 years. So, do you just have caps replaced as they go bad, or at what point do you replace all the caps in an amp? Do resistors or other parts (other than tubes) degrade, so replacing caps will just lead to some other failure? Is it like trying to keep an old car running?

Asking because I still enjoy the tube amp (Baron) I've had for 16 years. Not the best, but American made, still supported by Mesa, and I am not convinced that newer is better re: tube amps, or at least, not within semi-rational budgetary constraints. Equivalent performance from new production could cost dearly.
128x128lloydc
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listener57
730 posts
 
Elizabeth,
Thank you for your reply.
Seeing your name on a posting here on Audiogon is cause enough to check out the words of wisdom and experienced opinion to be discovered.
face
516 posts
 
As Elizabeth mentioned, unused is worse.

But the correct way to reform capacitors is with a variac.
jallen
502 posts
 
i replace them if they re crap caps. I like v-caps if you have room, the REL RT, or Theta caps. Big sound difference over stock caps if they used junkers.
palasr
526 posts
 
Resistors are inert and don't really change over time (they can drift in value from thermal stress, but that's another matter).

Capacitors are a different story. Electrolytic capacitors are the ones to change; film types tend to last a very long time and rarely need to be changed. Electrolytics contain a semi-liquid dielectric compound that dries out over time (used or not) leading to catastrophic failure. Electrolytics tend to be larger in value (over a couple of microfarads); film type caps tend be much smaller in value (under 1 microfarad).
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