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Capacitor type for tube preamp
Capacitor type for tube preamp
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Old 19th March 2016, 11:46 PM   #11
Nikolas Ojala is offline Nikolas Ojala  Finland
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Arrow No love for mica.

Quote:
Originally Posted by ericj View Post
No love for mica?
Do you like hysteresis?
Ref: The Sound of Capacitors
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Old 21st March 2016, 11:26 AM   #12
cl1238 is offline cl1238  Australia
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Thanks everyone for the info.
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Old 22nd March 2016, 08:04 PM   #13
Bob Richards is offline Bob Richards  United States
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Electrolytics should be replaced if they're old and weren't used much (the applied voltage apparently maintains the integrity of the dielectric over time, and lack of it allows deterioration). With regular use, I've got many electrolytics that still work great after 30 years. Some ceramic caps are significantly non-linear and temperature sensitive. I only use those in the power supply circuits (a .01u 3kV across the AC line and across the primary and secondary power transformer winding). Most plastic dielectric caps are fine. I try to use polyprops or polystyrenes when I can, and go with other plastic dielectrics (mylar etc.) when I can't get what I need in PP or PS. The bigger issue might be the manufacturers. Most are fine, but there may be some "boutique" brands that don't really know what they are doing. In a tube circuit, make sure the voltage rating is more than enough at turn-on, when B+ is significantly higher than when the tubes start conducting, and load down the power supply.
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Old 22nd March 2016, 08:08 PM   #14
ericj is offline ericj  United States
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Electrolytic capacitor chemistry has come a long way in even the last 20 years. It generally makes sense to replace them.

.:Sent by pneumatic tubes
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Old 22nd March 2016, 08:32 PM   #15
juanitox is offline juanitox  France
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Quote:
Originally Posted by ericj View Post
No love for mica?

.:Sent by pneumatic tubes
i prefer silver mica than Polystyrene in coupling application more natural Highs for me .. cheap to try
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Old 30th August 2016, 02:27 PM   #16
dotneck335 is offline dotneck335  United States
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DIY Audio guru Rod Elliott says:
"Once someone starts sprouting utter BS about the "audibility of capacitors" they are no longer credible.*There is no credible evidence that any film cap is aurally different from any other."
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Old 1st September 2016, 07:03 AM   #17
Gnobuddy is online now Gnobuddy  Canada
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..."There is no credible evidence that any film cap is aurally different from any other."


-Gnobuddy
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Old 1st September 2016, 10:50 AM   #18
SY is offline SY  United States
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Capacitor type for tube preamp
This is true IF the corner frequency is well below the lowest frequency of interest, and that none of the caps are pathological (e.g., "hand made" with PTFE dielectric).

For filtering, it's plausible that some caps might sound different.
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