cap value for 6X4 rectifier?

PeteMcK · 23rd August 2006, 09:32 PM

Hi Guys,

I'm slowly converting an old radio into a guitar amp;

it has a 6X4 rectifier tube, & I want to replace the PS capacitors.

I have some 82uF (400v) on hand, would these be too big (cause to much start-up current)?

I'm thinking of using 3 all up in the B+ chain
(rectifier - cap - R - cap - R - cap)

(I'll probably eventually replace the tube with diodes, - but it's there, wired, & I'm very lazy....)

cheers,
Pete McK

Simpleton · 23rd August 2006, 09:39 PM

The maximum capacitor value for this rectifier is 40uF. You can series connect 2 of your caps to make one 40uF cap for a first and from then on the others may be larger value.
Good luck!

6x4 - 40uF - R- C - R - C

PeteMcK · 23rd August 2006, 10:04 PM

Thanks Simpleton,
I'll look for a smaller cap then.

cheers,
Pete MCk

Geek · 23rd August 2006, 10:28 PM

Hi,

I've used a 47uF in my headphone amp after a 6X4 and she hasn't quit even after years of service. Plenty of on/off cycles

Zen Mod · 23rd August 2006, 10:43 PM

Quote:

Originally posted by Geek
Hi,

I've used a 47uF in my headphone amp after a 6X4 and she hasn't quit even after years of service. Plenty of on/off cycles

you certainly use wimpy xformer

that can be explanation for long life of (nearly ) abused 6X4

anatech · 23rd August 2006, 10:50 PM

Hi Geek,
I have to agree with Zen Mod. High transformer resistance saved it.

Why not go a little lower in value with the first cap (because there is a minimum supply resistance in those specs) and filter a little heavier later on?

-Chris

arnoldc · 23rd August 2006, 10:59 PM

Hi choky!

I have a 6X4 rectifier which is somewhat noisy. Any tricks to make it silent? (not by changing it)

alexmoose · 23rd August 2006, 11:07 PM

What will happen? because I am making a project using a 6X4 Rectifier, that shows using 50uf caps in two LC filters

30H----50uf----30H----50uf

will it explode?

Zen Mod · 23rd August 2006, 11:08 PM

Quote:

Originally posted by arnoldc
Hi choky!

I have a 6X4 rectifier which is somewhat noisy. Any tricks to make it silent? (not by changing it)

try to place some resistors in anodes (series with secondaries

) and also few nanofarads across "diodes" (A to K and A to K) ;if that no helps,than change it

6X4 must be dirt cheap ,even from your place ......

arnoldc · 23rd August 2006, 11:13 PM

Choky, thanks for the info. In my place, beer is cheaper than tubes

23rd August 2006, 09:32 PM	#1
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	cap value for 6X4 rectifier? Hi Guys, I'm slowly converting an old radio into a guitar amp; it has a 6X4 rectifier tube, & I want to replace the PS capacitors. I have some 82uF (400v) on hand, would these be too big (cause to much start-up current)? I'm thinking of using 3 all up in the B+ chain (rectifier - cap - R - cap - R - cap) (I'll probably eventually replace the tube with diodes, - but it's there, wired, & I'm very lazy....) cheers, Pete McK

23rd August 2006, 09:39 PM	#2
Simpleton diyAudio Member Join Date: Jan 2005 Location: Lisboa	The maximum capacitor value for this rectifier is 40uF. You can series connect 2 of your caps to make one 40uF cap for a first and from then on the others may be larger value. Good luck! 6x4 - 40uF - R- C - R - C __________________ "There's something organic about a happy cloud of electrons" - Neutron Bob

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23rd August 2006, 10:04 PM	#3
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	Thanks Simpleton, I'll look for a smaller cap then. cheers, Pete MCk

23rd August 2006, 10:28 PM	#4
Geek diyAudio Member Join Date: Sep 2004	Hi, I've used a 47uF in my headphone amp after a 6X4 and she hasn't quit even after years of service. Plenty of on/off cycles

23rd August 2006, 10:50 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Geek, I have to agree with Zen Mod. High transformer resistance saved it. Why not go a little lower in value with the first cap (because there is a minimum supply resistance in those specs) and filter a little heavier later on? -Chris

23rd August 2006, 10:59 PM	#7
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	Hi choky! I have a 6X4 rectifier which is somewhat noisy. Any tricks to make it silent? (not by changing it)

23rd August 2006, 11:07 PM	#8
alexmoose diyAudio Member Join Date: Mar 2006 Location: Michigan	What will happen? because I am making a project using a 6X4 Rectifier, that shows using 50uf caps in two LC filters 30H----50uf----30H----50uf will it explode?

23rd August 2006, 11:13 PM	#10
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	Choky, thanks for the info. In my place, beer is cheaper than tubes

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