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Noise - HK Sound House 600
Noise - HK Sound House 600
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Old 15th November 2017, 09:10 AM   #1
dhaman is offline dhaman  Slovakia
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Join Date: Dec 2009
Location: Banska Bystrica
Noise - HK Sound House 600
Default Noise - HK Sound House 600

Hello, I have this PA system on the table. I'm working on hi-fi mostly this is first PA system.

ISSUE: There is huge noise on tweeter even if volume is down.

I'm trying to do something with power amp.
I added 22pF parallel to R27. but it not helps.

Do you have any idea what can be upgrade to do low noise ? Thank you for any ideas.

Schematics of poweramps: schematics.png
Service manual: hughes_kettner_lucas_600_service_manual.pdf
Attached Images
File Type: png schematics.png (167.1 KB, 47 views)
Attached Files
File Type: pdf hughes_kettner_lucas_600_service_manual.pdf (539.9 KB, 9 views)
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Old 18th November 2017, 02:04 AM   #2
MAAC0 is offline MAAC0  Portugal
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Join Date: May 2010
What kind of noise ?
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Old 18th November 2017, 02:21 AM   #3
rayma is offline rayma  United States
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Join Date: Apr 2011
Quote:
Originally Posted by dhaman View Post
There is huge noise on tweeter even if volume is down.
Make sure the output Zobel resistors are ok, and not burned up.

Last edited by rayma; 18th November 2017 at 02:25 AM.
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