Marantz PM66 se problems, information wanted

alan_w · 13th April 2007, 12:22 AM

I have been doing some research on this amp as my own has been having some problems, in that the right side output channel is at a lower volume than the left, which wasn't the case about 2 months ago.

Whenever I put in this amp into google it comes up with this website, and from what I have read I assume that this site is full of people who know far more than I ever will about this subject, so, like a moth to light it drew me in.

I am not totally sure what the problem actually is yet, I have ruled out the CD player (Marantz CD-48), the speakers (Kef Q35) and the cables (QED) and narrowed it down to the amp right hand speaker channel.

I have been told that Leaky electrolytic filter caps will result in audible hum, as there is no hum that rules that out. The thing is, the sound is good on both channels, but the left channel is quite a bit louder than the right, meaning that the balance has to be almost all the way to the right to actually balance it.

Does anyone have any ideas/hints/tips? Where can I get a schematic from so that I can start detailed diagnostics?

If it helps, I took some photos of the insides of the amp, mainly to document, but also incase it showed anything obvious up.

Thanks for your help, I appreciate it.

Leolabs · 13th April 2007, 01:21 AM

Leaky signal/feedback caps or dirty volume/balance control.

alan_w · 13th April 2007, 09:41 AM

Sorry, I forgot to include the link to the photos. Probably won't help but I include them anyway (tried to look for a way to edit the OP but couldn't find one).

http://alan-wall.fotopic.net/c1254209.html

Juko · 6th May 2007, 05:59 PM

I had the same problem with a Yamaha amplifier. Cleaning the speaker protection relay-contacts solved the problem.

13th April 2007, 12:22 AM	#1
alan_w diyAudio Member Join Date: Apr 2007	Marantz PM66 se problems, information wanted I have been doing some research on this amp as my own has been having some problems, in that the right side output channel is at a lower volume than the left, which wasn't the case about 2 months ago. Whenever I put in this amp into google it comes up with this website, and from what I have read I assume that this site is full of people who know far more than I ever will about this subject, so, like a moth to light it drew me in. I am not totally sure what the problem actually is yet, I have ruled out the CD player (Marantz CD-48), the speakers (Kef Q35) and the cables (QED) and narrowed it down to the amp right hand speaker channel. I have been told that Leaky electrolytic filter caps will result in audible hum, as there is no hum that rules that out. The thing is, the sound is good on both channels, but the left channel is quite a bit louder than the right, meaning that the balance has to be almost all the way to the right to actually balance it. Does anyone have any ideas/hints/tips? Where can I get a schematic from so that I can start detailed diagnostics? If it helps, I took some photos of the insides of the amp, mainly to document, but also incase it showed anything obvious up. Thanks for your help, I appreciate it.

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Marantz PM66 KI tweeks	Fidelity Audio	Solid State	462	7th February 2012 05:41 PM
wanted marantz pm66 amp	paul.42	Swap Meet	0	6th April 2009 08:09 PM
marantz pm 75 coaxial information	kdlsrinu	Solid State	0	10th August 2006 06:45 AM

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


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

13th April 2007, 01:21 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Leaky signal/feedback caps or dirty volume/balance control.

13th April 2007, 09:41 AM	#3
alan_w diyAudio Member Join Date: Apr 2007	Sorry, I forgot to include the link to the photos. Probably won't help but I include them anyway (tried to look for a way to edit the OP but couldn't find one). http://alan-wall.fotopic.net/c1254209.html

6th May 2007, 05:59 PM	#4
Juko diyAudio Member Join Date: Jan 2007	I had the same problem with a Yamaha amplifier. Cleaning the speaker protection relay-contacts solved the problem.

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