Jump to content


buzz on crown dc300a


  • Please log in to reply
4 replies to this topic

#1 dolores

dolores
  • Members
  • 2 posts

Posted 15 June 2006 - 12:46 PM

just got a crown dc300a, hooked it up and got some serious buzz coming out of my speakers (urei 813b). as soon as i hit the powerswitch it starts, volume level on the amp doesn't change the level of the buzz, neither does unplugging the input signal.
any ideas what that could be?
thanks

#2 mtarr

mtarr
  • Members
  • 3 posts

Posted 27 June 2006 - 07:34 PM

QUOTE(dolores @ Jun 15 2006, 01:46 PM)
just got a crown dc300a, hooked it up and got some serious buzz coming out of my speakers (urei 813b). as soon as i hit the powerswitch it starts, volume level on the amp doesn't change the level of the buzz, neither does unplugging the input signal.
any ideas what that could be?
thanks
View Post


Dolores,
I just fixed my amp, same symptoms.  I changed C4 and C5.  
-Morty

#3 dolores

dolores
  • Members
  • 2 posts

Posted 04 July 2006 - 10:11 AM

QUOTE(mtarr @ Jun 27 2006, 07:34 PM)
QUOTE(dolores @ Jun 15 2006, 01:46 PM)
just got a crown dc300a, hooked it up and got some serious buzz coming out of my speakers (urei 813b). as soon as i hit the powerswitch it starts, volume level on the amp doesn't change the level of the buzz, neither does unplugging the input signal.
any ideas what that could be?
thanks
View Post


Dolores,
I just fixed my amp, same symptoms.  I changed C4 and C5.  
-Morty
View Post



this is a little beyond my comprehension. what is c4 and c5?

thanks

#4 Stephane

Stephane

    Power User

  • Members
  • PipPipPipPipPip
  • 269 posts

Posted 04 July 2006 - 04:41 PM

Capacitor number 4 and 5(C4,C5) if you look on your electronic schematic of your amplifier,C4 is a 10 mfd 160 volts and C5 is a 10 mfd 50 volts vertical. Good luck.


QUOTE(dolores @ Jul 4 2006, 10:11 AM)
QUOTE(mtarr @ Jun 27 2006, 07:34 PM)
QUOTE(dolores @ Jun 15 2006, 01:46 PM)
just got a crown dc300a, hooked it up and got some serious buzz coming out of my speakers (urei 813b). as soon as i hit the powerswitch it starts, volume level on the amp doesn't change the level of the buzz, neither does unplugging the input signal.
any ideas what that could be?
thanks
View Post


Dolores,
I just fixed my amp, same symptoms.  I changed C4 and C5.  
-Morty
View Post



this is a little beyond my comprehension. what is c4 and c5?

thanks
View Post


#5 joust

joust

    Power User

  • Members
  • PipPipPipPipPip
  • 505 posts

Posted 08 July 2006 - 01:02 PM

I don't know if this will help, but I had this DC300 with low volume buzz that I couldn't remove. A local tech advised me to replace the micas isolators on the output devices. Lo and behold! the buzz disappeared!  biggrin.gif