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Tubes for Mcintosh MR71

I've got a McIntosh MR71 tuner that I’ve done some tube rolling on but I have not been very pleased with the results. What I think are new tubes are resulting in increased background noise and poorer selectivity. I don’t have a tube tester so I can’t check tubes to confirm they are “new”. I am about to get the tuner aligned and want to use the best tubes I can since my understanding is the tubes effect the alignment (with the obvious exception of the audio tubes). Has anyone found what they think are the best tubes for use in this tuner?
pmotz

Showing 1 response by s23chang

s23chang
617 posts
 
Try some Amperex 6BL8, Mullard M8162 ( 12AT7 ), Amperex 7316 ( 12AU7 ) and Amperex 6U8. For 6AU6A, stick with GE or RCA.

I still own MR-71 and have sent back to Richard Modifferi ( ex-Mac chief engineer ) for the upgrade mod. The gain is much better and very quiet overall. The mod also increased the lower frequency response. YOu should really consider to send it to Richard. Regular tune and repair is $350 via audioclassics. Don't let anyone else touch you tuner other than a Mac person. I learned from the hardway and got rip off and made worst sound...
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