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RE: Now and then

Posted by John Elison (A) on January 27, 2015 at 20:12:44

In Reply to: RE: Now and then posted by Dave Garretson on January 27, 2015 at 17:32:20:

The T-2000 has a turns ratio of 1:56 and it worked well with the MM phono stage in my Yamaha C-2x preamp, which had 35-dB gain. I got no audible noise that I can remember.

The Bob's Devices CM-1131 SUT has a turns-ratio of 1:40. It might work equally well with the MC-2000. A turns-ratio of 1:40 is only 3-dB less than 1:56.

I'm kind of surprised you are getting excessive noise with your Pass Labs XP-25. I own the XOno, which supposedly has 75-dB maximum gain and I get no noise with my DL-S1. I know that my DL-S1 has 3-times the rated output as your MC-2000, but based on its 40-Ω DC coil resistance in conjunction with my 20-Ω loading configuration, the results should be about the same.

Phono Stage Output = (Phono Stage Gain) x (Rated Cartridge Output) x (Phono Stage Load) ÷ [(Phono Stage Load) + (Cartridge DC Coil Resistance)]

76-dB = 6310-gain
75-dB = 5623-gain

MC-2000 / XP-25 Output = 6310 x 50-µV x 50-Ω ÷ (50-Ω + 3-Ω) = 298-mV

DL-S1 / XOno Output = 5623 x 150-µV x 20-Ω ÷ (20-Ω + 40-Ω) = 281-mV

I wonder if cartridge age might have reduced the MC-2000's output voltage or increased its coil resistance, or both? The only other option is that your XP-25 is rather noisy or else your tube line-stage is noisy. Anyway, I would think you should be getting excellent performance with your MC-2000 using 76-dB gain.

Best regards,
John Elison

PS. Something else just occurred to me. I wonder if the magnet in the MC-2000 has lost some of it magnetism over the years. If you have a test record with a 5-cm/s 1000-Hz test tone, you might want to measure the output from the MC-2000. You can measure it at the output of the XP-25.

Edits: 01/27/15 01/28/15

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