Discussion:
4/20 uf electrolytic capacitor?
Michael Griggs
2013-01-26 16:19:34 UTC
Permalink
Hi there,

Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.

What does the 4/20 part mean?

Any help would be greatly appreciated.

Thanks
Michael

--
Ben Barwise
2013-01-26 17:47:26 UTC
Permalink
I imagine that means 4uf 20v but cant be too sure.
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
--
Michael Griggs
2013-01-26 17:54:25 UTC
Permalink
thanks for your response.

It is actually

4/20 mfd x 450V electrolytic... hmmm

could it have anything to do with bipolar electrolytic caps?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
Ben Barwise
2013-01-26 18:02:06 UTC
Permalink
Oh weird i guess it could literally mean 4 20ths ? But i have never seen
caps written like that. Probably some oldschool thing!
Post by Michael Griggs
thanks for your response.
It is actually
4/20 mfd x 450V electrolytic... hmmm
could it have anything to do with bipolar electrolytic caps?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
--
Mark Steward
2013-01-26 18:04:27 UTC
Permalink
If it's a parts list, could it just mean 4 of them?


Mark
Post by Michael Griggs
thanks for your response.
It is actually
4/20 mfd x 450V electrolytic... hmmm
could it have anything to do with bipolar electrolytic caps?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
Adrian Godwin
2013-01-26 18:20:42 UTC
Permalink
If it's a valve amp, the big metal caps were often multi section. So
it's perhaps 4 x 20 uF caps in the same can.
Post by Mark Steward
If it's a parts list, could it just mean 4 of them?
Mark
Post by Michael Griggs
thanks for your response.
It is actually
4/20 mfd x 450V electrolytic... hmmm
could it have anything to do with bipolar electrolytic caps?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
--
Michael Griggs
2013-01-26 18:25:41 UTC
Permalink
excellent. Thanks.

I found a link to this:
http://tubedepot.com/cp-ce-20x4-475v.html

Not sure how to find them on farnell though.
Post by Adrian Godwin
If it's a valve amp, the big metal caps were often multi section. So
it's perhaps 4 x 20 uF caps in the same can.
Post by Mark Steward
If it's a parts list, could it just mean 4 of them?
Mark
Post by Michael Griggs
thanks for your response.
It is actually
4/20 mfd x 450V electrolytic... hmmm
could it have anything to do with bipolar electrolytic caps?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
--
Adrian Godwin
2013-01-26 18:38:58 UTC
Permalink
You're not likely to find them at Farnell - more likely a specialist
like the link you found.

There's no reason why you can't use 4 separate caps though if you can
mount them. Just make sure you use at least that voltage rating
(higher is OK) and roughly that capacitance (no need to be too
accurate, they're usually +100, -50% tolerance anyway .. i.e. could be
half or double what it says on the tin).
Post by Michael Griggs
excellent. Thanks.
http://tubedepot.com/cp-ce-20x4-475v.html
Not sure how to find them on farnell though.
Post by Adrian Godwin
If it's a valve amp, the big metal caps were often multi section. So
it's perhaps 4 x 20 uF caps in the same can.
Post by Mark Steward
If it's a parts list, could it just mean 4 of them?
Mark
Post by Michael Griggs
thanks for your response.
It is actually
4/20 mfd x 450V electrolytic... hmmm
could it have anything to do with bipolar electrolytic caps?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
--
--
Adrian Godwin
2013-01-26 18:26:29 UTC
Permalink
This isn't the right value but it's an example of the style

http://www.ebay.co.uk/itm/230764355934
Post by Adrian Godwin
If it's a valve amp, the big metal caps were often multi section. So
it's perhaps 4 x 20 uF caps in the same can.
Post by Mark Steward
If it's a parts list, could it just mean 4 of them?
Mark
Post by Michael Griggs
thanks for your response.
It is actually
4/20 mfd x 450V electrolytic... hmmm
could it have anything to do with bipolar electrolytic caps?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
Michael Griggs
2013-01-26 18:49:34 UTC
Permalink
oh great,

so i can have 4 20uF caps with all leads wired together between to turrets?
do they have to join before they reach the post? or would it be better to
run two between two turrents and the opther two to another two turrets and
bridge them together?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
Adrian Godwin
2013-01-26 19:11:30 UTC
Permalink
Not all together, unless that's what the schematic requires (in which
case just use one 80uF. 68uF or 100uF will be easier to find and near
enough).

Just one lead of each (probably the negative, but check) and then use
the resulting five leads as though they were the original (which might
have only 4 pins, all the negatives going to the case / chassis).

-adrian
Post by Michael Griggs
oh great,
so i can have 4 20uF caps with all leads wired together between to turrets?
do they have to join before they reach the post? or would it be better to
run two between two turrents and the opther two to another two turrets and
bridge them together?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
Adrian Godwin
2013-01-26 19:17:55 UTC
Permalink
This must be the schematic :

Loading Image...

It looks as though they're only using 3 sections, but they are all
separate, making a 3-stage filter for the 300V supply (so the input
stage gets the minimum amount of mains hum).

So just use 3 450V 22uF. Can types might be nicer for ruggedness and
appearance but wire-ended ones will work just as well.
Post by Adrian Godwin
Not all together, unless that's what the schematic requires (in which
case just use one 80uF. 68uF or 100uF will be easier to find and near
enough).
Just one lead of each (probably the negative, but check) and then use
the resulting five leads as though they were the original (which might
have only 4 pins, all the negatives going to the case / chassis).
-adrian
Post by Michael Griggs
oh great,
so i can have 4 20uF caps with all leads wired together between to turrets?
do they have to join before they reach the post? or would it be better to
run two between two turrents and the opther two to another two turrets and
bridge them together?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
--
Michael Griggs
2013-01-26 19:32:50 UTC
Permalink
excellent, that's a lot of help.

I think i might do that.

Still a little confused as to how to solder them in (bit of a noob)

So i connect the negative terminal to the turret, and the other two
negatives joint the negative lead after the turret?
likewise with the positive?
Post by Adrian Godwin
http://vibrochamp.org/wp-content/uploads/2011/06/vibrochamp-schematic.jpg
It looks as though they're only using 3 sections, but they are all
separate, making a 3-stage filter for the 300V supply (so the input
stage gets the minimum amount of mains hum).
So just use 3 450V 22uF. Can types might be nicer for ruggedness and
appearance but wire-ended ones will work just as well.
Post by Adrian Godwin
Not all together, unless that's what the schematic requires (in which
case just use one 80uF. 68uF or 100uF will be easier to find and near
enough).
Just one lead of each (probably the negative, but check) and then use
the resulting five leads as though they were the original (which might
have only 4 pins, all the negatives going to the case / chassis).
-adrian
Post by Michael Griggs
oh great,
so i can have 4 20uF caps with all leads wired together between to
turrets?
Post by Adrian Godwin
Post by Michael Griggs
do they have to join before they reach the post? or would it be better
to
Post by Adrian Godwin
Post by Michael Griggs
run two between two turrents and the opther two to another two turrets
and
Post by Adrian Godwin
Post by Michael Griggs
bridge them together?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
--
Adrian Godwin
2013-01-26 19:54:03 UTC
Permalink
Difficult to say without seeing how you're building it.

Probably all 3 negatives to the turret.
Post by Michael Griggs
excellent, that's a lot of help.
I think i might do that.
Still a little confused as to how to solder them in (bit of a noob)
So i connect the negative terminal to the turret, and the other two
negatives joint the negative lead after the turret?
likewise with the positive?
Post by Adrian Godwin
http://vibrochamp.org/wp-content/uploads/2011/06/vibrochamp-schematic.jpg
It looks as though they're only using 3 sections, but they are all
separate, making a 3-stage filter for the 300V supply (so the input
stage gets the minimum amount of mains hum).
So just use 3 450V 22uF. Can types might be nicer for ruggedness and
appearance but wire-ended ones will work just as well.
Post by Adrian Godwin
Not all together, unless that's what the schematic requires (in which
case just use one 80uF. 68uF or 100uF will be easier to find and near
enough).
Just one lead of each (probably the negative, but check) and then use
the resulting five leads as though they were the original (which might
have only 4 pins, all the negatives going to the case / chassis).
-adrian
Post by Michael Griggs
oh great,
so i can have 4 20uF caps with all leads wired together between to turrets?
do they have to join before they reach the post? or would it be better to
run two between two turrents and the opther two to another two turrets and
bridge them together?
Post by Michael Griggs
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf
electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
--
Martin Klang
2013-01-26 19:22:58 UTC
Permalink
is your 4/20 capacitor a 5 pin part?

/m
Post by Michael Griggs
oh great,
so i can have 4 20uF caps with all leads wired together between to turrets? do they have to join before they reach the post? or would it be better to run two between two turrents and the opther two to another two turrets and bridge them together?
Hi there,
Building a fender vibrochamp and the parts list lists a 4/20 uf electrolytic capacitor.
What does the 4/20 part mean?
Any help would be greatly appreciated.
Thanks
Michael
--
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