What is this component used for?

Mrpong · 30th August 2004, 11:02 AM

Hello

I'm planning to upgrade some components in my amplifier. I found four brown components that I'm not familiar with.

Two of them are shown in the picure. What are they and their purpose? Can we replace them with better ones? Please suggest.

Thank you.

SY · 30th August 2004, 11:53 AM

Those are 4.7 uF capacitors. Film caps, decent quality. You could buy more fashionable ones, but they won't be any better functionally. Can't say anything about their purpose without a lot more information, like a schematic.

Mrpong · 30th August 2004, 01:02 PM

Thank you so much.

Anyway, could you please tell me how the code means "4.7 uF"?

Unfortunately I don't have its schematic, but what I can tell you now is that these film caps are located between an input section and driving section.

Generally, can they be replaced with the polypropylene type (i.e. SCR or solen)?

UrSv · 30th August 2004, 01:08 PM

That type of cap with that type marking is marked in pF. First two digits are value and third digit is number of zeroes. So 475 is 4700000 pF = 4700 nF = 4.7 uF.

Mrpong · 30th August 2004, 01:12 PM

OH Thank you.
How about replacing them with poly or paper-in-oil ?

Nisbeth · 30th August 2004, 10:45 PM

You can do that if you want, but how much benefit you'll get from a replacement depends on what their function are in the circuit.

/U.

EchoWars · 31st August 2004, 11:15 AM

Quote:

Originally posted by Mrpong
OH Thank you.
How about replacing them with poly or paper-in-oil ?

They are poly, or at least look like it.

Appear to be good caps. I'd leave 'em alone.

30th August 2004, 11:53 AM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Those are 4.7 uF capacitors. Film caps, decent quality. You could buy more fashionable ones, but they won't be any better functionally. Can't say anything about their purpose without a lot more information, like a schematic. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

30th August 2004, 01:08 PM	#4
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden	That type of cap with that type marking is marked in pF. First two digits are value and third digit is number of zeroes. So 475 is 4700000 pF = 4700 nF = 4.7 uF. __________________ UrSv Those who say it can't be done should not stop those who are doing it.

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30th August 2004, 01:02 PM	#3
Mrpong diyAudio Member Join Date: Aug 2004 Location: Bangkok	Thank you so much. Anyway, could you please tell me how the code means "4.7 uF"? Unfortunately I don't have its schematic, but what I can tell you now is that these film caps are located between an input section and driving section. Generally, can they be replaced with the polypropylene type (i.e. SCR or solen)?

30th August 2004, 01:12 PM	#5
Mrpong diyAudio Member Join Date: Aug 2004 Location: Bangkok	OH Thank you. How about replacing them with poly or paper-in-oil ?

30th August 2004, 10:45 PM	#6
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	You can do that if you want, but how much benefit you'll get from a replacement depends on what their function are in the circuit. /U.

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