Hard to say what is exactly wrong with your unit but have you tested all the tubes? I have had several MR-67s and MR-71s and a host of other tube tuners and have miracles happen with tube change to high quality NOS Tubes.
modafferi mod for mcintosh tuner
I have a mcintosh MR67 tuner which needs some work (intermittently noisy and low sensitivity)and was wondering if the modaferri mod($500)might be a good option. Does anyone have have experience with this mod and or/repairs. The tuner is in good shape physically and sounds better than the NAD that it replaced.
Thanks
Thanks