2. amps-preamps
  3. 193101-7321

Preamp with separate volume control for each channel?

Thought I should ask you knowledgable folks for thoughts and recommendations.  Recently had my vintage Music Reference RM-9 repaired after losing the left channel.  Now it produces output, but at a considerably reduced level:  Left side volume at 9, for instance, while right side has to be about 5 to match output. 

  I'm using an old Promitheus Transformer Based preamp to make things work; tried a different passive with a single volume control and it just didn't work. 

   I had some issue with the repair shop regarding the amp and am reluctant to take it back to them.   

Thanks for any input.

 

leadfeathers
yogiboy's avatar
yogiboy
5,763 posts
 

AUDIBLE-ILLUSIONS preamps have separate volume controls for each channel!

https://www.hifishark.com/search?q=audible+illusions

wturkey's avatar
wturkey
817 posts
 

Agreed with the Audible Illusions units. 

leadfeathers OP
13 posts
 

Thanks everyone for your suggestions and comments.  I agree that the best solution is to get the amp repaired properly, but am frankly discouraged.  

  The backstory is that a couple years ago, the right channel went out.  I took it to a nearby electronics repair shop; don't think he had an emphasis on audio.  He charged about $300 and a couple weeks to get it going again.  It functioned well, sounded fine, except that the bias adjustment for the right channel didn't work anymore, which is to say that adjusting the pot didn't dim the light, which was how the bias was determined.  

    When the left channel went out, I was reluctant to take it back to him.  So I took it to George Meyer Audio in L.A.  Asked them to repair the left channel and get the right side bias adjustment feature working again.  

  They charged about $600, replaced several caps, filter caps, FETs.  And the bias still didn't light.  

  I'd been using 4 KT120's, but wanted to use new ones.  While I waited for them to arrive, I plugged in 8 6550's I used originally.  One of them popped, blew the fuse on that side.  After I replaced the fuse, received the new KT120's, I've had this issue with the uneven output.  Am not suggesting its an issue with George Meyer's workmanship; but the bias adjustment issue (and the hour and a half drive to L.A.) have me reluctant to return it to them.  

Don't know of another repair shop in So Cal.  

Anyway, thanks for all your input.    Jeff

 

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