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Opamp Phono Noise
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Old 3rd June 2019, 09:16 PM   #31
audiopro is offline audiopro  Canada
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I'm not using any kind of measurement here as of yet. Strictly audible noise. My next step is to put them on the test rig, and measure noise and distortion. Then I'll find the best compromise IC for MM and for MC. It will probably be neither of these opamps.
I'm also using just what I have on hand, so as to not spend any money on this.
You are right. The TL071 does outperform the LT1028 on MM. I hadn't checked that initially.
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Old 3rd June 2019, 09:45 PM   #32
MarcelvdG is offline MarcelvdG  Netherlands
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That will more or less boil down to choosing the op-amp with the lowest overall noise for a source impedance of about 1.2 kohm.

For a 500 mH moving-magnet cartridge and using RIAA- and A- weighting, the effective cartridge impedance is about 12 kohm.
The sensitivity of a moving-coil cartridge is typically about one tenth of the sensitivity of a moving-magnet cartridge.
When you noise-optimize for about a tenth of 12 kohm, noise current will affect the SNR with a moving-magnet cartridge about as much as the noise voltage will affect the SNR with moving coil.
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Old 3rd June 2019, 10:00 PM   #33
tschrama is offline tschrama  Netherlands
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Quote:
Originally Posted by MarcelvdG View Post
That will more or less boil down to choosing the op-amp with the lowest overall noise for a source impedance of about 1.2 kohm.

For a 500 mH moving-magnet cartridge and using RIAA- and A- weighting, the effective cartridge impedance is about 12 kohm.
The sensitivity of a moving-coil cartridge is typically about one tenth of the sensitivity of a moving-magnet cartridge.
When you noise-optimize for about a tenth of 12 kohm, noise current will affect the SNR with a moving-magnet cartridge about as much as the noise voltage will affect the SNR with moving coil.
op-37 or one of its modern equivalents then?
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Old 3rd June 2019, 10:02 PM   #34
dreamth is offline dreamth  Romania
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