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Old 26th July 2005, 01:25 PM   #1
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Default Dual phono chip

A friend of mine asked me for some help in improving a phono preamp on his receiver.

The problem is it uses a dual DIP chip: M5220P. It's supposed to be a low-noise chip, but it's all I know.

It's unlikely it's nothing special, so it might be interesting an upgrade to a better chip.

Being dual limits the choices somehow, so my personal favourite OPA627 unfortunately, is not an option here.

I wonder if it's good keeping the FET inputs or if the choices should be widened, including some bipolars. Once again, the bipolars I know, like the LT1028 or LT1115, are single types.

So what might be a good choice?

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Old 26th July 2005, 02:07 PM   #2
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Default Duals

For very low noise, OPA2228.
For a little higher noise but better sound, OPA2132.
You can also make an adapter and try the AD8620 (SMD).
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Old 26th July 2005, 02:08 PM   #3
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Try an OPA2227/2228, you may surprised how good it sounds. The AD8620 is also a good candidate, as well as the RC4560 which actaully sounds quite nice.
Less pulp more juice Twisted Pear Audio.
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Old 26th July 2005, 03:07 PM   #4
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NE5532 ... it isn't considderd hi-end, but the noise / thd spec are hi-end ...
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Old 26th July 2005, 04:28 PM   #5
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Well, with so many options to try, better put a socket first.

Can anyone tell me how you compute the gain of RIAA stage?

I say this because some chips may not be unity-gain stable, and I was just reading that at high frequencies the RIAA will eventually take gain to 1.

This layout uses a single chip, with the RIAA eq on the feedback.

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Old 27th July 2005, 03:22 PM   #6
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try 4580 too
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