Stahle.......As I understand it, the McIntosh branded tubes being used in their current tube preamps and amps are manufactured by JJ Tubes in their Russian plant. My suggestion is buy two Gold Lion ECC83/B759 (12AX7) gold pin tubes, and perhaps another pair of Tung-Sol Gold 12AX7 / ECC803S tubes. This will allow you to swap the different tubes and make direct comparisons, plus give you spares. Remember, all vacuum tubes have a break-in period that can exceed 60 hours or more, so don't make snap decisions on their sound until you have sufficient hours on each pair.
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Dan
STUDIO - McIntosh C1000C/P, MC2301 (2), MR88, Aurender N10, Esoteric K-01X, Shunyata Sigma spdif digital cable, Sonos Connect, PurePower 2000, Stillpoints, Furutech Flux 50, Michell Gyro SE, Michell HR Power Supply, SME 309, Ortofon Cadenza Black, Wireworld, Sonus faber Amati Anniversario
LIVING ROOM - McIntosh C2300, MC75 (2), MR85, Magnum Dynalab 205, Simaudio MOON Neo 260D-T, Schiit Audio Yggdrasil, Aurender N100H, Shunyata Sigma USB cable, Micro Seiki DD40, Ortofon Cadenza Blue, Nakamichi BX-300, Sony 60ES DAT, PS Audio P10, Furutech Flux 50, Sonos Connect, Stillpoints, Wireworld, Kimber, PMC EB1i, JL Audio f113
VINTAGE - McIntosh MA230, Tandberg 3011A tuner, Olive 04HD, Sony DTC-59ES DAT, McIntosh 4300V, JBL 4312A
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