Very important recommendation! Contact Sam's Audio Labs. Sam is "the" expert on your amp.
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Cool. I had a McIntosh MR71 Tuner that was upgraded by Audio Classics some years back. It sounded really good, but today's heavy cables caused stress on those old jacks. I sent the tuner to Sam, and he upgraded all the jacks. He then converted the audio section to full triode. I was astonished by the sound.
The best part, is that he works with all kinds of equipment and will provide different levels of service at reasonable rates.