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Old 2nd February 2014, 09:16 PM   #1751
Joerytech is offline Joerytech  Netherlands
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Then I don't know, maybe peter has an idea. to bad for you, I'm really enjoying his amp. and the previous amp I used seemed not to be the worst and peter's is way out of that's league .
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Old 2nd February 2014, 09:22 PM   #1752
Peter Daniel is offline Peter Daniel  Canada
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Quote:
Originally Posted by Xerxes75 View Post
My old standard LM3886 gives better results...
How is it built then?
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Old 2nd February 2014, 09:31 PM   #1753
Xerxes75 is offline Xerxes75  Netherlands
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The lm3886 is from chipamp.com is also dual mono and uses 2x25v transformer and the usual chipamp power supply and only the standard parts are used.

I see a lot off builders using caps on the input, could this be the answer?
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Old 2nd February 2014, 09:45 PM   #1754
Joerytech is offline Joerytech  Netherlands
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Quote:
Originally Posted by Xerxes75 View Post
Mmmhh i checked it and all seems fine, and as I play my lm3886 and ta2020 with same speakers in the same room the bass sounds more alive and much deeper. Maybe Peter Daniel has an idea?
The overall sound is extremely pretty...a better bass would make it complete..
To bad you live far from me, if you want your very welcome to come over to listen here in Eindhoven
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Old 2nd February 2014, 09:56 PM   #1755
Joerytech is offline Joerytech  Netherlands
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Listening to Armin van Buuren now, max volume, great bass, definition, simply WOOWWW.
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Old 2nd February 2014, 10:03 PM   #1756
Peter Daniel is offline Peter Daniel  Canada
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Quote:
Originally Posted by Xerxes75 View Post
The lm3886 is from chipamp.com is also dual mono and uses 2x25v transformer and the usual chipamp power supply and only the standard parts are used.

I see a lot off builders using caps on the input, could this be the answer?
In that case put the similar caps in LM4780 and you should receive similar results. Previous pic shows that larger caps will fit on rectifier board.

Caps on the input are only needed when source shows DC offset, otherwise, in most cases, they will degrade the sound.
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Last edited by Peter Daniel; 2nd February 2014 at 10:06 PM.
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Old 2nd February 2014, 10:18 PM   #1757
Joerytech is offline Joerytech  Netherlands
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Quote:
Originally Posted by Peter Daniel View Post
In that case put the similar caps in LM4780 and you should receive similar results. Previous pic shows that larger caps will fit on rectifier board.

Caps on the input are only needed when source shows DC offset, otherwise, in most cases, they will degrade the sound.
But so much influence??
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Old 3rd February 2014, 07:53 AM   #1758
Xerxes75 is offline Xerxes75  Netherlands
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Thanks for your replies, I will try the swap with the parts.

Eindhoven is a bit far otherwise I would have a listen but thanks anyway!
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Old 3rd February 2014, 10:08 AM   #1759
AndrewT is offline AndrewT  Scotland
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Quote:
the amp float and the chassis and copper bar will never touch the floor.
The pics in post1738 show the copper bar is bolted to the thick aluminium Chassis. It is not floating. That aluminium is you heatsink.
Have you inserted Thermal Paste into the joint between copper and aluminium to reduce thermal resistance. Why only 2 bolts? Three would be better, five are probably good enough.
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Last edited by AndrewT; 3rd February 2014 at 10:13 AM.
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Old 3rd February 2014, 11:54 AM   #1760
Joerytech is offline Joerytech  Netherlands
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Quote:
Originally Posted by AndrewT View Post
The pics in post1738 show the copper bar is bolted to the thick aluminium Chassis. It is not floating. That aluminium is you heatsink.
Have you inserted Thermal Paste into the joint between copper and aluminium to reduce thermal resistance. Why only 2 bolts? Three would be better, five are probably good enough.
I said the AMP is floating, not the copper bar.
Its bolted with 3 M5 bolts to the aluminum chassis.
I did not use paste because I'm not sure the paste can cause electrolytic corrosion, Two different metals with fluid in between can cause the least noble metal (not sure you say it like that in English) to corrode away.

3 bolts are enough as the metal strips are thick and will only very slightly bend.
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