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Old 6th July 2011, 04:56 PM   #1
thermen is offline thermen  Italy
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Default AR3a Capacitor needs substitution? Help me

good evening,

I have disassembly my AR3a for repair and check the capacitors with my Beckman RCL Bridge.
It's old model (1968), the crossover mount old Paper/Oil capacitor and when i measure it i read:

single capacitor -> nominal 6uF measure = 7.3uF
double capacitor-> nominal 50+150uF measure = 64+186 uF

It's a good idea replace it or no? I'm very undecided......Please give me your opinion and suggestion

thanks for all and sorry for my english
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Old 6th July 2011, 06:44 PM   #2
AllenB is offline AllenB  Australia
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Join Date: Oct 2008
The paper in oil may be OK. They can sound good and sometimes not. If you want to try a polypropylene (for example) to see how it sounds, a value of 7u3 will show you the differences but 6u0 should produce the 'correct' result.

The other sounds as if it may be an electrolytic? If so, I'd replace that with a pair of new ones.
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Old 6th July 2011, 11:08 PM   #3
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Location: New England
Quote:
Originally Posted by thermen View Post
good evening,

I have disassembly my AR3a for repair and check the capacitors with my Beckman RCL Bridge.
It's old model (1968), the crossover mount old Paper/Oil capacitor and when i measure it i read:

single capacitor -> nominal 6uF measure = 7.3uF
double capacitor-> nominal 50+150uF measure = 64+186 uF

It's a good idea replace it or no? I'm very undecided......Please give me your opinion and suggestion

thanks for all and sorry for my english

You have a classic AR3a capacitor problem - drifted uF properties. When they drift, the original crossover target points also shift. Thus, the sound no longer is as the designers intended.
Replace the 6 uf with a film cap. Dayton has 6.2 uF 1% caps & don't worry about the new voltage ratings.
Replace the 50 and 150 with audio grade non-polar electrolytics.
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Old 11th July 2011, 04:03 PM   #4
thermen is offline thermen  Italy
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Join Date: Feb 2011
Location: Siena Italy
Thanks at all,

I think my summer will be a working summer....
I try your suggestion and listen for best result

bye
Thermen
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Old 20th March 2013, 01:40 AM   #5
soshs is offline soshs  China
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How is your result?
I did that but doesn't seem better than before,maybe worse.
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Old 2nd July 2014, 08:19 AM   #6
soshs is offline soshs  China
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Actually there was a vast difference when I upgraded other gears as I made the change back and forth a couple times
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Old 2nd July 2014, 12:41 PM   #7
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Quote:
Originally Posted by soshs View Post
Actually there was a vast difference when I upgraded other gears as I made the change back and forth a couple times
What does that mean?

Did you find a final result with new film caps improved or not?
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