Nice report. Thanks.
I've always enjoyed tube-rolling in my amps (though 2 power tubes per channel has always been my max). So much so I'm second-guessing my choice to go back to solid-state.
If there was not so much expense involved I would suggest trying a set of 6550s if the MC2301 allows for same (as does the MC275/MC75/etc.). In my MC275/MC75 amps I found the 6550s to have a bit better mid-range and not quite the bass.
My experience with GL tubes was the same as your report. A small, but noticeable improvement over stock. Plus, considering the cost of McIntosh branded tubes I always preferred to run GL or Tung-Sol and have the stock tubes on the shelf.
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Glenn...
Canton Reference 9 Clearaudio SM Pro Focal Bathys JLA 10" Dominion Kuzma Stabi S w/MC & MM Magnepan 1,7i McIntosh MA8950 & MR88 Oppo 203 Roon Nucleus Rose Hifi RS150B Shunyata Gemini-4 Sony ST-A6B, TA-F6B, ST-J75 & PS-X75 Sorane SA1.2 & TA-1L Stillpoints LP1v2 WW Pt, Au & Ag
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