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Old 12th September 2012, 09:33 PM   #1
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Default Help with Multi Section Can Cap replacement


I am replaceing the multi section cans on my Crown SXA. The current cans are 40/10/10/10 @ 475v. I would like to keep the look as original as possible so my preference would be the CE MFg. models. I understand increased capacitance can be benificial in these cases but how much is too much? Which would be my best option.

40/20/20/20uF 525 VDC, CE Manufacturing

40/40/20/20uF 525 VDC, CE Manufacturing (What would be best section to run second 40uf to)

20/20/20/20 F @ 475 VDC, CE Manufacturing (with additional parallel 20uf sub chassis)

I have included a schematic

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Old 13th September 2012, 12:35 AM   #2
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Default SXA schematic

Schematic for Crown SXA
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File Type: jpg sxa-photofact1.jpg (758.1 KB, 69 views)
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Old 13th September 2012, 12:43 AM   #3
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Default ooops!

Sorry that last Multi ca option should read

20/10/10/10uF 450*VDC, CE Manufacturing with a 20uf cap in parallel under the chassis for the 40uf section. Note that this capacitor is 450v compared to the original which is 475v
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Old 13th September 2012, 12:44 AM   #4
jjman is offline jjman  United States
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I would use the 40/20/20/20.
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Old 13th September 2012, 12:45 AM   #5
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Schematic Added
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Old 13th September 2012, 12:50 AM   #6
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I would also use the 40-20-20-20 just because it's the closest to original.
"It is hard to imagine a more stupid or more dangerous way of making decisions than by putting those decisions in the hands of people who pay no price for being wrong." ~Thomas Sowell
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Old 13th September 2012, 06:10 AM   #7
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Thanks for your input. Are there any risks or short comings to increasing the capacitance this much? Are there any compensations required elsewhere in the circuit if the capacitance is increased?
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Old 13th September 2012, 03:44 PM   #8
Struth is offline Struth  Canada
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Location: books at londonpower.com
Hi Guys

The best option is to leave the original cans in place and disconnect them completely from the circuit. Then use individual modern caps inside the chassis and connect them to the circuits they power. This allows the ground for each cap to be placed where the circuit is rather than having a compromised joined ground where signals can modulate each other.

Have fun
Kevin O'Connor
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