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Old 23rd August 2006, 09:32 PM   #1
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Default 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
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Old 23rd August 2006, 09:39 PM   #2
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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
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Old 23rd August 2006, 10:04 PM   #3
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Thanks Simpleton,
I'll look for a smaller cap then.

cheers,
Pete MCk
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Old 23rd August 2006, 10:28 PM   #4
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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
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Old 23rd August 2006, 10:43 PM   #5
Zen Mod is offline Zen Mod  Serbia
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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
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Old 23rd August 2006, 10:50 PM   #6
anatech is offline anatech  Canada
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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
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Old 23rd August 2006, 10:59 PM   #7
arnoldc is offline arnoldc  Philippines
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Hi choky!

I have a 6X4 rectifier which is somewhat noisy. Any tricks to make it silent? (not by changing it)
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Old 23rd August 2006, 11:07 PM   #8
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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?
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Old 23rd August 2006, 11:08 PM   #9
Zen Mod is offline Zen Mod  Serbia
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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 ......
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Old 23rd August 2006, 11:13 PM   #10
arnoldc is offline arnoldc  Philippines
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Choky, thanks for the info. In my place, beer is cheaper than tubes
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