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Old 2nd February 2006, 09:01 AM   #11
Dave S is offline Dave S  United Kingdom
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I don't know about the AMP01 but I built the AMP02 many years ago.

It had an error on the pcb whiich caused dc offset at the o/p of the SSM2016, although even when this was corrected the sound was not great.

The SSM2017 actually sounds better than the 2016 and is much easier to apply.

I have full set of AMP02 articles but would not recommend expending any effort on this project - there are many better sounding and much simpler RIAA stages around.

Dave
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Old 3rd February 2006, 03:02 AM   #12
tmblack is offline tmblack  United Kingdom
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Hello Dave,

I was intrigued by the balanced input which might help with hum.

Which circuits do you like better?

Tom

EE
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Old 3rd February 2006, 02:01 PM   #13
Dave S is offline Dave S  United Kingdom
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Hi Tom,

The AMP02 sounded better when the 2016 was replaced by a 2017. AD845 is also not one of my favourite opamps.
Unfortunately I used silver plated ptfe wire (before I knew better)for the balanced tonearm cable with my Amp02 - this gave a rather bright and spitty sound quality. Reverting to a "normal" arm cable in unbalanced mode gave much better results and hum was never an issue anyway (why try to solve a problem that does not exist?).

A JLH discrete RIAA stage sounded better that the AMP02 (and very similar to a Linn Kairn phono stage). In fact any competently designed 2 or 3 stage phono amp using decent opamps (e.g. AD797, OP27/37 or even NE5534 ) sounds better that the AMP02 IMHO.

What to build instead?
I'm not sure - I rarely listen to records nowadays. Maybe best to look for recommendations from somebody like Werner.

Cheers,

Dave
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Old 4th February 2006, 06:09 PM   #14
tmblack is offline tmblack  United Kingdom
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Is it understood why silver plated ptfe wire gives this sound quality?

How do you ground your tonearm?
Several players I have savaged have horrible hum, like an old Thoren.

Tom

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Old 4th February 2006, 08:06 PM   #15
forr is offline forr  France
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In case it can help, I still havef many of Duncan's articles published in Hifi-News.

~~~~~~~~ Forr

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