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Old 20th April 2005, 04:21 PM   #1
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Default Upgrading Lm3886 Board Caps

Hi i have built some of Brians Lm3886 based amps and think they sound superb. Very happy in general, however as always i was wondering about a few upgrades.

I have come by some panasnoic purism caps 4.7uf 50v which i was thinking about replacing the input caps with. Has anyone used Purism caps and if so would they be an upgrade from the standard FC in there.

Also i have bought some Elna Duorex II 100uf 50v which i was thinking about sticking in in place of the standard FC caps on the amp boards. I imagine this would help but how much can i expect from these types of upgrades?

Fil
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Old 20th April 2005, 10:39 PM   #2
Nuuk is offline Nuuk  United Kingdom
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For an input cap, you can't do better than a polypropylene film cap. You won't be able to add it to the PCB but it shouldn't be difficult to accommodate one if you want better sound.
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Old 20th April 2005, 11:01 PM   #3
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Hi Nuuk,

Since your from the u.k. are there any good one in Maplin.

http://www.maplin.co.uk/search.aspx?...enu=y&doy=20m4

there are two ranges there which ones are the type of thing i should be looking for and what sort of values?

Fil
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Old 21st April 2005, 09:26 AM   #4
Nuuk is offline Nuuk  United Kingdom
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Quote:
Since your from the u.k. are there any good one in Maplin.
The audio grade type from Maplin are good. The other type are not available in big enough values. CPC do some similar types as well.
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Old 21st April 2005, 10:59 AM   #5
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Thanks Nuuk,

What sort of value do you recommend, 4.7 uf?

fil
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Old 21st April 2005, 12:06 PM   #6
Nuuk is offline Nuuk  United Kingdom
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Quote:
What sort of value do you recommend, 4.7 uf?
I usually use 4.7uF but I think anything from 2.2 uF - 4.7 uF is fine.
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Old 21st April 2005, 12:31 PM   #7
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Thanks very much,

Gonna pop out at lunch time and get some.

Fil
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Old 21st April 2005, 01:29 PM   #8
Nuuk is offline Nuuk  United Kingdom
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Quote:
Gonna pop out at lunch time and get some.
You lucky so and so! The nearest place that I can by a resistor or cap is about 30 miles away!
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Old 21st April 2005, 01:53 PM   #9
brianuk is offline brianuk  United Kingdom
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You expect the local Maplin to carry the Audio grade caps? You'll be lucky! And if they do, check the values on them regardless of which draw the guy says "I got them out of ...."

Two trips for one ******* pot was slightly annoying!!
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Old 21st April 2005, 02:14 PM   #10
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True,

Just got back, " sorry we 'aven't had those in for a couple of years".

And only 3 out of 4 of the voltage regulators i need to try and repair my Arcam Alpha 5 CDP

And the one on tottenham crt Rd. is huge

Helpful people as always.

fil
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