Trying to figure out what a part is in an amplifier.

Beat_Dominator · 20th July 2007, 05:32 AM

I am trying to find out two things about these parts in a car amplifier I am upgrading.

1) What are they

*edit* (The green guys

)

2) Who made them?

The numbers on them make me think they are a resistor of some sort, but I cannot seem to find anything quite like em.

Any answers you guys might have would be much appreciated!

Geek · 20th July 2007, 05:36 AM

Hi,

I don't recognize the logo, so I can't answer who made them.

They are mylar capacitors though. 0.047uF (473) at 10% (K)

Cheers!

Beat_Dominator · 20th July 2007, 06:12 PM

Thank you! Do you know what the "2A" refers to?

Also, what is the logic behind "473" = .047uF ? I know more than the average person when it comes to electronics but I'm not the most educated when it comes to the reasons behind some of the nomenclature!

poynton · 20th July 2007, 06:33 PM

The codes are well known and are published in several books.

logic has nothing to do with it. see mullard tube codes.

Andy

Nigel Goodwin · 20th July 2007, 06:39 PM

Quote:

Originally posted by Beat_Dominator
Thank you! Do you know what the "2A" refers to?

Also, what is the logic behind "473" = .047uF ? I know more than the average person when it comes to electronics but I'm not the most educated when it comes to the reasons behind some of the nomenclature!

The code is quite simple and logical, it's the value in picofarads, with the last digit being the number of zeros to add on the end, so it's 47 (+3 zeros) or 47000pF, which is also 0.047uF or 47nF.

Beat_Dominator · 20th July 2007, 07:43 PM

Ahhh thank you Nigel. I never said it wouldn't be logical, as most of these things are...... they just aren't all predictable!

jacco vermeulen · 20th July 2007, 10:01 PM

BD,

this one is, you got the first answer because this type of polyester cap is green, aka Greenies.
Even wittier, the manufacturer thought it would be even easier to name the brand "Green"
2A means it's a 100 volt cap.
(if only girls had a color code)

Magura · 20th July 2007, 10:14 PM

Quote:

Originally posted by jacco vermeulen

(if only girls had a color code)

Oh, they do

When their faces turn red, you've done something wrong and you will be in the dog house for an arbitrary number of days, ranging from 1 to infinite.....

Magura

jnb · 21st July 2007, 12:07 AM

And when their face is white you know you'll have to return those new electrostatics.

Beat_Dominator · 21st July 2007, 03:29 AM

Thank you all again for the info. I am thinking about replacing all 33 of these capacitors in the amplifier as the amp is 20 years old.

I am just giving the electrolytics in this amplifier an overhaul and I thought, while I'm at it, why not replace the other capacitors?! I have read debates on this forum about the life span of various parts.... any input on how long mylar caps stay within tolerance?

(I am doing this project just for fun, and I don't mind what some might see as "frivolous" expenses

)

20th July 2007, 05:32 AM	#1
Beat_Dominator diyAudio Member Join Date: Jul 2005 Location: Phoenix, AZ	Trying to figure out what a part is in an amplifier. I am trying to find out two things about these parts in a car amplifier I am upgrading. 1) What are they edit (The green guys ) 2) Who made them? The numbers on them make me think they are a resistor of some sort, but I cannot seem to find anything quite like em. Any answers you guys might have would be much appreciated! __________________ :-P

20th July 2007, 06:12 PM	#3
Beat_Dominator diyAudio Member Join Date: Jul 2005 Location: Phoenix, AZ	Thank you! Do you know what the "2A" refers to? Also, what is the logic behind "473" = .047uF ? I know more than the average person when it comes to electronics but I'm not the most educated when it comes to the reasons behind some of the nomenclature! __________________ :-P

20th July 2007, 06:33 PM	#4
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	The codes are well known and are published in several books. logic has nothing to do with it. see mullard tube codes. Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

20th July 2007, 07:43 PM	#6
Beat_Dominator diyAudio Member Join Date: Jul 2005 Location: Phoenix, AZ	Ahhh thank you Nigel. I never said it wouldn't be logical, as most of these things are...... they just aren't all predictable! __________________ :-P

20th July 2007, 10:01 PM	#7
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	BD, this one is, you got the first answer because this type of polyester cap is green, aka Greenies. Even wittier, the manufacturer thought it would be even easier to name the brand "Green" 2A means it's a 100 volt cap. (if only girls had a color code) __________________ Looks like Sponge Bob has killed another thread.


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20th July 2007, 05:36 AM	#2
Geek diyAudio Member Join Date: Sep 2004	Hi, I don't recognize the logo, so I can't answer who made them. They are mylar capacitors though. 0.047uF (473) at 10% (K) Cheers!

21st July 2007, 12:07 AM	#9
jnb diyAudio Member Join Date: Dec 2006	And when their face is white you know you'll have to return those new electrostatics.

21st July 2007, 03:29 AM	#10
Beat_Dominator diyAudio Member Join Date: Jul 2005 Location: Phoenix, AZ	Thank you all again for the info. I am thinking about replacing all 33 of these capacitors in the amplifier as the amp is 20 years old. I am just giving the electrolytics in this amplifier an overhaul and I thought, while I'm at it, why not replace the other capacitors?! I have read debates on this forum about the life span of various parts.... any input on how long mylar caps stay within tolerance? (I am doing this project just for fun, and I don't mind what some might see as "frivolous" expenses ) __________________ :-P

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