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Phono Termination Calculations and Calculator
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Old 10th January 2019, 06:37 PM   #21
jackinnj is online now jackinnj  United States
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Reference Recording LP's are available from their website (but note that some are 45 rpm, not 33's)
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Old 10th January 2019, 06:59 PM   #22
jackinnj is online now jackinnj  United States
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Quote:
Originally Posted by billshurv View Post
Noise should be about 6dB higher with the resistively loaded case.
Both are resistively loaded.
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Old 10th January 2019, 09:52 PM   #23
billshurv is online now billshurv  United Kingdom
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I have enough RR, Wilson, Sheffield labs and Crystal clear on vinyl for any collection, although the Don Mclean albums on CD more recently are superb, if needing to have the HDCD decoded.



What I meant was that in loading low enough to get a passive 75us rolloff you get a chunk noisier. That's why Bob only went to 8kHz, although it was shown here that a cooled load does work well here.
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Old 11th January 2019, 01:38 AM   #24
jackinnj is online now jackinnj  United States
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track #3 of that RR recording of Slavonic Dances -- when me and my buds did the listening test for the regulator article in Linear Audio you could un-mistakenly decipher the issues with some of the designs.
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Old 11th January 2019, 09:27 AM   #25
billshurv is online now billshurv  United Kingdom
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Doesn't look like the LP is currently available. Shame as always helps to have same test music as others.
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Old 11th January 2019, 11:14 AM   #26
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by jackinnj View Post
So, we can do this -- substitute LM4562 for LME49710 in each case. The gain setting resistor in the T5 compensated amplifier is lowered to 88 ohms so that the gains of both amplifiers are almost exactly equal. a 1us pole replaces the 75us pole so that some of the values change.

I'm open to suggested recording torture tests. We've used "Rachmaninoff Symphonic Dances, Funeral March Andante con moto (tempo di valse), Reference Recordings 5" -- good (excellent) if you can find it.
Jack what happens if you add a few 100 pF to the input as cable cap in each case?

Jan
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Last edited by jan.didden; 11th January 2019 at 11:16 AM.
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Old 11th January 2019, 02:36 PM   #27
jackinnj is online now jackinnj  United States
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Quote:
Originally Posted by jan.didden View Post
Jack what happens if you add a few 100 pF to the input as cable cap in each case?

Jan
Just theoretical -- the actual charts from the Bode 100 were created using a Shure M78 cartridge -- the simulations are close to what to expect from a Shure V15:
Attached Images
File Type: png Cartridge Loading V15 47k.png (26.8 KB, 33 views)
File Type: png Cartridge Loading V15 5k2.png (26.3 KB, 32 views)
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Old 11th January 2019, 03:04 PM   #28
jackinnj is online now jackinnj  United States
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Noise (simulated) is higher with the damped input:
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File Type: png Cartridge Loading V15 Noise.png (42.5 KB, 31 views)
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