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Old 22nd July 2010, 02:33 PM   #1
zog666 is offline zog666  Australia
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Default identify coupling capacitor in Rotel RA-820BX2

I've just been looking into an old amp of mine (now sold to a friend) to replace the capacitors as the electroytics would be getting pretty old now.

I was able to find the service manual from:
which is very handy!

Tracing the circuit I can see 2 coupling capacitors where the line level inputs go in, 1uF rated.. but the type is not mentioned and they aren't familiar to me (but I'm a bit of a newby at this). These are C602 and C601 in the diagram by the way

Anyone know what these kind of capacitors are? -

Click the image to open in full size.

(the blocky silver one in the middle)

.. and the follow on question, how good are they (should I bother replacing them)
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Old 22nd July 2010, 02:48 PM   #2
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These capacitors are multilayer type capacitors with an open construction (not sealed in resin or anything like that). They are an older type of capacitor and if you are replacing the rest of the caps, you may as well do these too. Although they probably won't have gone out of tolerance and will be fine, its best to replace them anyway. Multilayer type capacitors are dirt cheap these days and shouldn't be hard to find.
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Old 22nd July 2010, 03:29 PM   #3
alexcp is offline alexcp  United States
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This cap looks like a Metallized Polyester Film (MKT), e.g. Epcos B3256x (see Should be replaceable with any good MKT or better MKP cap.
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Old 23rd July 2010, 12:34 PM   #4
zog666 is offline zog666  Australia
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ok, thanks.. got a bag of red WIMA MKP10 0.47uF caps here, 2 of those (= 0.94uF) should make a nice replacement.

for what it's worth, heres a peep inside the amp (leaving off the phono stage which is 1/4 of the PCB but I'm not interested in)

Click the image to open in full size.

Last edited by zog666; 23rd July 2010 at 12:37 PM.
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