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Old 11th December 2009, 05:57 PM   #1
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Location: Winnipeg MB Canada
Default 2 board versions, 2 different input caps, which is better?

Hello guys and gals,

I am re-building a couple Marantz MA500 and have ran into something interesting:

-On the schematic CS01 is a .1uf ceramic cap.
-one one amp, board # YN176J231-0 the CS01 is indeed a .1uf ceramic.
-on the other amp board # YN176J231-4 the CS01 is a 4.7uf polar electrolytic.

I would assume the YN176J231-4 is the later version. What do you think is the better value to use?

I was thinking of switching this cap to a 1uf up to a 4.7uf polypropylene. Or maybe a better quality electro like a Cerafine or black gate. What would you suggest for this location?

This cap, CS01, runs in parallel with the + signal input, and is the first component after the RCA jack.

Any and all suggestions would be appreciated.

Best Regards

Kevin
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Old 11th December 2009, 09:37 PM   #2
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Join Date: Dec 2006
Location: Overtaxed Long Island, NY
CS01 is for the inverting op amp to be used when these amps are bridged. If you have no desire to do this then don't worry about it. Be more concerned with C701, 4.7Uf guy. Here is where a good cap will help.

OBTW, have you researched the infamous MA500 capacitor failings and what caps need to be changed out? If not I suggest you do. My 2 MA500's would go into protection with 2 watts output into an 8 ohm load. Changed out the bad caps with Pana FC 105 degree caps and these babies now sing loudly.
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Old 11th December 2009, 09:45 PM   #3
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Join Date: Oct 2002
Location: Winnipeg MB Canada
Quote:
Originally Posted by jrockhead View Post
CS01 is for the inverting op amp to be used when these amps are bridged. If you have no desire to do this then don't worry about it. Be more concerned with C701, 4.7Uf guy. Here is where a good cap will help.

OBTW, have you researched the infamous MA500 capacitor failings and what caps need to be changed out? If not I suggest you do. My 2 MA500's would go into protection with 2 watts output into an 8 ohm load. Changed out the bad caps with Pana FC 105 degree caps and these babies now sing loudly.
Thanks for the advice! I have swapped out all electros except the (2) big filter caps. In C701 I have an Elna Cerafine 4.7uf 100v.
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