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McIntosh Audio A Tradition of Excellence

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  #11  
Old 09-12-2019, 07:34 PM
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jdandy jdandy is online now
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Quote:
Originally Posted by miner View Post
Dan,
Was this tube testing in preparation for your new amps?
Kevin......Yes and no. By that I mean yes, I knew the new amps were on the way and I wanted to ensure the C2300 performance wasn't being held back by weak tubes. The no part of the answer is I normally have an annual schedule for preventative maintenance that I usually perform each year in June. I was lax this year and let June, July, and August slid by without doing my due diligence. This has been a tough year for me. Here it is September already, so the arrival of the MC75's triggered me to get in gear.

When I perform my annual tube testing I keep records of each tube's numbers, i.e. transconductance, gain, and in the case of the small tubes, noise. That way when next year's tests are done I can refer back to the previous year's numbers for reference. I also test and record the information on all new tubes purchased, again as a reference point for testing annually once new tubes are put in service. I also test new tubes to ensure that when I pay for matched tubes they actually are matched. I have found a couple instances where one out of four matched tubes was way off the mark. I buy from reputable tube venders so getting a replacement happens without an issue. Like everything else, some things require specialized tools. Owning tube preamplifiers and tube power amplifiers practically demands that a tube tester be available.
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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

Last edited by jdandy; 09-12-2019 at 10:17 PM.
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  #12  
Old 09-12-2019, 10:05 PM
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  #13  
Old 09-13-2019, 01:09 PM
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sub'd also for fun, I have a c 50 but for some reason I'd love to try a 2300.
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  #14  
Old 09-13-2019, 02:39 PM
Marmarosa Marmarosa is offline
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Quote:
Originally Posted by jdandy View Post
Chema.......The higher output voltage of moving magnet phono cartridges negates some of the necessity for ultra quiet tubes in a phono stage. The higher signal levels produce from moving magnet designs deliver a louder signal that requires less amplification from the phono stage circuitry, so the noise floor is essentially masked to a certain degree by the stronger signal. That said, it is never a bad thing to have the quietest tubes in a phono stage, be they moving coil or moving magnet.
Thank´s again, maestro.
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