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Electrolytic vs polyprop capacitors
Electrolytic vs polyprop capacitors
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Old 15th September 2005, 12:07 PM   #1
Puggie is offline Puggie  United Kingdom
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Default Electrolytic Vs polyprop capacitors

I have searched and not found an answer either here or in the musical instrument section.

I'm building a Fender Champ clone, a very basic guitar amp with 6V6GT for the power section. The amp has a number of 8, 16 and 25uF caps in there, now the supplier of the kit supplies electrolytic caps for these positions, but I've been building passive Xovers recently so anything upto 60uF I automatically go for polyprop caps out of habit because they are what I have been using for the Xovers.

What would the effect be of replacing these larger value electrolytic caps with polypropylene equivalents? I'm building the amp chassis from scratch so space isn't an issue, there is only a few of them so cost is not a big worry.

what is YOUR opinion, will their be any improvement in the sound, would I loose any character of the amp etc. I'm not trying to make a carbon copy of the amp, just a decent small all vale amp with a good tone.
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Old 15th September 2005, 12:17 PM   #2
SY is offline SY  United States
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For a guitar amp, I don't see much advantage. For a hifi amp, it might be worthwhile.

It would look cool (pp caps are MUCH bigger), and you might get better long term reliability.
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Old 15th September 2005, 12:32 PM   #3
Geek is offline Geek
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Ditto what SY said.

A sound generator is somewhat less critical than a reproducer.
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Old 27th November 2020, 02:22 AM   #4
redrooster is offline redrooster  Australia
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I've been using motor run polypropylene capacitors with good results in speaker crossovers. They are exactly the same thing but way cheaper. You can hot glue the smaller ones in and zip tie the bigger ones.
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Old 27th November 2020, 04:04 AM   #5
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by Puggie View Post
I have searched and not found an answer either here or in the musical instrument section.

I'm building a Fender Champ clone, a very basic guitar amp with 6V6GT for the power section. The amp has a number of 8, 16 and 25uF caps in there, now the supplier of the kit supplies electrolytic caps for these positions, but I've been building passive Xovers recently so anything upto 60uF I automatically go for polyprop caps out of habit because they are what I have been using for the Xovers.

What would the effect be of replacing these larger value electrolytic caps with polypropylene equivalents? I'm building the amp chassis from scratch so space isn't an issue, there is only a few of them so cost is not a big worry.

what is YOUR opinion, will their be any improvement in the sound, would I loose any character of the amp etc. I'm not trying to make a carbon copy of the amp, just a decent small all vale amp with a good tone.
In a Champ circuit?
NO improvement AT ALL.

Electrolytics are the way to go there.
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Old 27th November 2020, 06:25 AM   #6
MarcelvdG is offline MarcelvdG  Netherlands
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Presumably Puggie has already finished his guitar amp, 15 years is a long time.
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Old 27th November 2020, 07:16 AM   #7
analog_sa is offline analog_sa  Europe
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Electrolytic vs polyprop capacitors
It would still be interesting if he ever compared the two options. Don't think that guitar players fuss less about their amps than audiophiles. And they certainly hear better than blindfolded engineers

My attempts to convert any of my amps or preamps to a polyprop PS have ended up with reverting back to electrolytics. The only spot where i use a polyprop supply is in the fixed bias for the power amp. Elsewhere there is something wrong with the sound, especially the bass and image depth.

For giggles tried even prime quality polyprops like Clarity MR stacked up to above 100u and even then the Cerafines won.
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Old 27th November 2020, 10:46 PM   #8
Vovk Z is offline Vovk Z  Ukraine
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Guitar players need as much distortion as it can be so their 'best' is I think rather an opposite to a 'best' for engineers.
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