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Fluctuating volume in one channel: Part II

I posted a few days ago about my left channel volume fluctuating from time to time. I got advice saying that it was most likely either the tubes in the preamp or a bad solder joint on an interconnect.

I switched the tubes in the preamp from left to right and right to left and the problem stayed the same (left channel fluctuating). Then I switched the ICs between the preamp and the amp from right to left and left to right. The problem stayed the same (left channel still fluctuating).

I did not bother switching the ICs from the cd player to the preamp because the problem remains even if I listen from a different source.

What is next in line for me to test? If you would like to see the other thread, it can be found here:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1087439704&openusid&zzKetchup&4&5#Ketchup
Forgive me for starting another thread, but I know old threads don't always get read.
ketchup

Showing 3 responses by gnobber

gnobber
46 posts
 
Hello Ketchup,

I have a similar problem. I have Classe CAM 200 mono's. I have narrowed the problem down to one of the amps. In my case the volume doesn't entirely cut out, but when it goes, it goes down to about 1/4 of the normal amp's volume. It just started a few nights ago, and doesn't always happen (sometimes volume and quality are just fine from the amp). I was wondering what model you had, and what had happened with your repair.

thanks, Bill
gnobber
46 posts
 
Ketchup,

thanks for your reply. Good to hear that everything worked out with Classe- it is nice to know that they stand behind the product!

In my case I am using the XLR inputs, not the RCA's. I suppose the input board/shields that you mention are common to both RCA and XLR. My units are 2 1/2 yrs old.

I'll be darned but the amp has been running great for the past 48 hours. As soon as it acts up again I will be giving Classe a call.

thanks, Bill
gnobber
46 posts
 
Just an update . . . I sent in my amps to Classe via my dealer, and just got them back. So far so good after one night of listening. Armin mentioned replacing the shield wires, and replacing a resistor and cap, which he said wouldn't affect the unit sonically. Everything is sounding great once again!

Bill
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