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Replacement caps for Rotel RB-980BX
Replacement caps for Rotel RB-980BX
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Old 19th September 2019, 04:13 PM   #1
Rainman74 is offline Rainman74  Sweden
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Default Replacement caps for Rotel RB-980BX

Hi!

I plan (need) to replace a couple of capacitors in a pair of Rotel RB-980BX. Some of the capacitors are starting to look like frozen beer cans after 25 years or something :-)

Anyway. I'm having problems finding replacement caps for the 10000uF, 63V. The ones that are fitted are 35mm wide, 75 mm high, 4 "legged" with 22mm spacing of + and -. I've spent hours looking but cant find any new capacitors with the same spec. The limiting factors (besides 10kuF and 63V) are 35mm wide (no place to fit anything wider) and the 22mm spacing.

Anybody know of any capacitor that would fit, or have suggestions on how to solve the problem in any other way would be much appreciated.

//h
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Old 19th September 2019, 05:36 PM   #2
jaycee is offline jaycee  United Kingdom
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Is it possible you could drill a hole in the board so that 10mm spacings could be used? Or perhaps one of the dummy pin holes could be re-used?
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Old 19th September 2019, 05:41 PM   #3
cumbb is offline cumbb
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Philips Elkos 10000mF/63V - +85degC - 4 pin - NEU | eBay
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Old 19th September 2019, 05:43 PM   #4
cumbb is offline cumbb
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The bigger the better(-:
1 x Panasonic UP 15000uF 63V DC Through Hole Aluminium Electrolytic Capacitor | eBay
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Old 19th September 2019, 05:58 PM   #5
Rainman74 is offline Rainman74  Sweden
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Thank's for help and suggestions. A follow up question would then off course be if there is any potential issues with using bigger capacitors (bigger as in higher capacitance)?
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Old 19th September 2019, 06:33 PM   #6
jaycee is offline jaycee  United Kingdom
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Originally Posted by Rainman74 View Post
Thank's for help and suggestions. A follow up question would then off course be if there is any potential issues with using bigger capacitors (bigger as in higher capacitance)?
You may put excessive stress on the bridge rectifiers doing this, or cause inrush current issues that make the transformer primary fuse pop or your circuit breaker trip. 10,000uF per rail per channel is already very generous!
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Old 19th September 2019, 06:36 PM   #7
cumbb is offline cumbb
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No stress;-)

I would build in capacity, that's doable in size. 15 mF or 22 mF;-)

Furthermore I would replace the rectifier-bridges by shottky-diodes.
And I would connect the "mono" -psus. May be per switcher first - to listen the bollock "double-mono"-)
And I would remove the rectifier-bridge-bypass-capacities (10 nF, 500 V?)
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Old 19th September 2019, 06:39 PM   #8
jaycee is offline jaycee  United Kingdom
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Maybe change the rectifiers for 35A types and mount them somewhere to keep them cool.. other than that, no. I dont believe Schottky diodes for mains frequency rectification make any difference in sound quality.
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Old 19th September 2019, 06:41 PM   #9
Rainman74 is offline Rainman74  Sweden
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Originally Posted by jaycee View Post
Is it possible you could drill a hole in the board so that 10mm spacings could be used? Or perhaps one of the dummy pin holes could be re-used?
Would it be safe to drill new holes? The existing holes are fairly centered on the leading part of the PCB (dont know the exact term, I hope you understand) and new holes would need to be much closer to the edge. The dummy holes are just holes where there is not nothing but fiber glass on the PCB.
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Old 19th September 2019, 06:45 PM   #10
cumbb is offline cumbb
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Maybe change the rectifiers for 35A types and mount them somewhere to keep them cool.. other than that, no. I dont believe Schottky diodes for mains frequency rectification make any difference in sound quality.
Thought, we were in diyaudio, experienced and loving sound;-)

Just try;-)
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