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Old 14th January 2014, 09:04 PM   #1661
Zen Mod is offline Zen Mod  Serbia
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Amp Camp Amp - ACA
then just chill

bullmout - readings are OK

you didn't made 2K2 (Iq mod ) ?
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Old 14th January 2014, 09:10 PM   #1662
bullmout is offline bullmout  France
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thank you for your time

not gone yet the mod, I board the resistance in stock, I expected to get an idea of ​​the origin sond. and that all goes well and I would mod before closing the chassis
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Old 14th January 2014, 09:56 PM   #1663
kacernator is offline kacernator  Czech Republic
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Default LM317 regulated PSU

Hi,

I have built regulated supply for my ACA. It is rectifier - 10,000uF - LM317 - 470uF.

When I replace 470uF output cap for 1000uF the sound is worse - congested, less dynamic, less bass, mids stand out. WHY is that? All electrolytic caps are ordinary one, no low ESR.

Thanks.
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Old 14th January 2014, 11:07 PM   #1664
Zen Mod is offline Zen Mod  Serbia
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LM317 is sissy for that role
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Old 15th January 2014, 08:08 AM   #1665
kacernator is offline kacernator  Czech Republic
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Quote:
Originally Posted by Zen Mod View Post
LM317 is sissy for that role
Why? My ACA draws 1.1A which is fine for LM317. Anyway it doesn´t explain why 470uF output cap sounds much different than 1000uF.
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Old 15th January 2014, 08:48 AM   #1666
Samuel Jayaraj is offline Samuel Jayaraj  India
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LM317 output current is a bit low to for 1000uF. Look for circuits using LM317 using transistors for boosting output current.
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Old 15th January 2014, 03:23 PM   #1667
WalterW is offline WalterW  Netherlands
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Quote:
Originally Posted by kacernator View Post
Why? My ACA draws 1.1A which is fine for LM317. Anyway it doesn´t explain why 470uF output cap sounds much different than 1000uF.
Oscillation? 1000 uF is very big for the output of a LM317... you normally see values around 10 - 100uF
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Old 15th January 2014, 03:38 PM   #1668
Zen Mod is offline Zen Mod  Serbia
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Quote:
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LM317 is sissy for that role
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Old 15th January 2014, 03:45 PM   #1669
WalterW is offline WalterW  Netherlands
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and like ZM says it's too light for ACA...
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Old 16th January 2014, 01:25 PM   #1670
kpoznanski is offline kpoznanski
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Default Replacing LSK170 with Toshiba 2SK170 JFETs

Hello Everyone.

I wonder if any of the ACA builders have any experience replacing LSK170 with Toshiba 2SK170 JFETs.

Does it make a noticable difference in sound quality?

Also, does anyone know what grade of LSK170 comes with the ACA kit?
I am asking in reference to the Idss matching.

Any feedback would be very appreciated.
Thank you.

Kris
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