Mc C-22 Ce

Tubesin · 21st December 2006, 07:24 AM

Hello,
Do any one have the McIntosh C-22 Com. Ed. preamplifier schematic? I need it to check a trouble with the left channel with noise sustained noise while the other one is quiet....

waterman · 21st December 2006, 07:41 AM

visit the link below

http://www.berners.ch/McIntosh/Downloads/C22CE_ser.zip

Tubesin · 21st December 2006, 11:02 AM

Thank you, Waterman, this is great help to hunt for the trouble noises....

waterman · 21st December 2006, 02:44 PM

I'm also an Ex-owner of Mcintosh C22 CE. This pre-amp is pretty reliable. I guess the problem probably comes from the volume tuner or tube. Good luck.

Tubesin · 23rd December 2006, 01:56 PM

It's a constant low poping noise, looks like some resistor or capacitor....still hunting the source. Thank you. It's a pity it happen to both amplifier, my MC275CE also has problem with a output tube with red plate! Only one kt88, so, I changed the tube and problem still persist, I suspect the bias circuit. My system is on holiday........

Tubesin · 25th December 2006, 01:53 PM

Tracked the noisy problem is from a 11K resistor R43 to ground in the balance output circuit. It measures over 18K. So, one problem is fixed.

HollowState · 25th December 2006, 11:45 PM

Quote:

my MC275CE also has problem with a output tube with red plate!

Very likely a leaky coupling capacitor to the grid of the tube. To test it either just replace it or, with the amplifier off, unsolder the capacitor lead going to the grid. Then with the amplifier on, use your meter to look for any B+ an the floating cap lead. If so, replace it. Better yet, replace them both.

Victor

21st December 2006, 07:24 AM	#1
Tubesin diyAudio Member Join Date: Sep 2004 Location: macao	Mc C-22 Ce Hello, Do any one have the McIntosh C-22 Com. Ed. preamplifier schematic? I need it to check a trouble with the left channel with noise sustained noise while the other one is quiet....

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

21st December 2006, 07:41 AM	#2
waterman diyAudio Member Join Date: Oct 2003 Location: HK	visit the link below http://www.berners.ch/McIntosh/Downloads/C22CE_ser.zip

21st December 2006, 11:02 AM	#3
Tubesin diyAudio Member Join Date: Sep 2004 Location: macao	Thank you, Waterman, this is great help to hunt for the trouble noises....

21st December 2006, 02:44 PM	#4
waterman diyAudio Member Join Date: Oct 2003 Location: HK	I'm also an Ex-owner of Mcintosh C22 CE. This pre-amp is pretty reliable. I guess the problem probably comes from the volume tuner or tube. Good luck.

23rd December 2006, 01:56 PM	#5
Tubesin diyAudio Member Join Date: Sep 2004 Location: macao	It's a constant low poping noise, looks like some resistor or capacitor....still hunting the source. Thank you. It's a pity it happen to both amplifier, my MC275CE also has problem with a output tube with red plate! Only one kt88, so, I changed the tube and problem still persist, I suspect the bias circuit. My system is on holiday........

25th December 2006, 01:53 PM	#6
Tubesin diyAudio Member Join Date: Sep 2004 Location: macao	Tracked the noisy problem is from a 11K resistor R43 to ground in the balance output circuit. It measures over 18K. So, one problem is fixed.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)