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Old 4th March 2004, 03:13 PM   #1
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Default Large caps in PSU without choke?

Hi All,

I'm getting ready to rebuild my SE EL84 amp onto a nicer chassis and I have a question. I have a pair of dual section Elna Cerafine 220uF/450volt caps that I would like to use. Since I'm not using a choke in the PSU I should be able to use them shouldn't I? I have been using 32uF/500 volt dual section caps. Thanks.
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Old 4th March 2004, 03:47 PM   #2
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Tube rectifier? I have 2x2200uF 400VDC in my amp with a SS-rectifier. Works great.
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Old 4th March 2004, 04:58 PM   #3
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Quote:
Originally posted by Mikael Abdellah
Tube rectifier? I have 2x2200uF 400VDC in my amp with a SS-rectifier. Works great.
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Old 4th March 2004, 05:46 PM   #4
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Quote:
Originally posted by Sch3mat1c


Have you ever heard my amp?
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Old 4th March 2004, 07:54 PM   #5
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No, but I can hear the death screams of your power transformer's winding (unless it's hideously overrated) from here.

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Old 4th March 2004, 07:54 PM   #6
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No the rectifier is a GZ34.
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Old 4th March 2004, 09:46 PM   #7
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A GZ34 is only rated for maximum reservoir capacitance of 60uF. If you put 220uF directly on its output, the ripple current will quickly kill it. However, there's nothing to stop you using a 68uF as a reservoir (modern capacitors are far closer tolerance, so the slight, but controlled increase will be OK). You could then follow that with RC smoothing using your 220uF capacitors.
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Old 4th March 2004, 09:58 PM   #8
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Thanks!!
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Old 4th March 2004, 10:12 PM   #9
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Hi there.........really there's no need for so much cap/Joules...that sort of value sits in power drives.

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Old 4th March 2004, 10:59 PM   #10
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Default Capacitors

Quote:
Originally posted by G
No the rectifier is a GZ34.
Hello ,
If you're retaining the GZ34 why not upgrade to capacitors to motor runs ? 30uF 440V AC are easily obtainable and cheap . An improvement over electrolytics , as long as your chassis is big enough to house them...

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