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In Reply to: RE: High-gain Phono Preamps ? posted by jhajeski on January 23, 2016 at 12:40:31
Higher gain phono preamps add more noise. It's just the nature of the beast. A lot of people use a stepup transformer (SUT)with a MM preamp to combat this......
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For an active gain stage the SNR will be set by its first gain stage. After that you can keep amplifying by adding more gain stages, the SNR will remain the same. What matters is the input noise of that first gain stage.As long as the gain of the first stage is above 3, you can usually pretty much ignore the contribution of the following stages.
Now, adding the transformer changes that, of course.
Edits: 01/24/16 01/24/16
You post, "Higher gain phono preamps add more noise. It's just the nature of the beast."
That statement is not necessarily the case. Note here I am focusing on the "add more noise" portion of your post. Several high quality phono pre-amps with gain at or around 72 dB do not appear to add noise. These phono pre-amps work wonders with LO MC carts having output of .25mV or less.
For example: Pass Labs XP-25; EAR 324 (both of which I have owned);and Boulder 1008 (which I have heard - or more accurately which did not add noise). I am convinced there are others. And with investigation one may find more moderately priced units are equally quiet.
Cheers,
Ian
Agreed, makes sense. Thank you.
I agree that you might want to think about a Step Up Transformer, which takes your signal ads gain and then sends it along to the phono pre of your pre amp. You might want to look at SUTs anyway. They are passive and quite small. I don't have a link for you but it should be easy to find .
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