Ben Duncan's AMP 01 - Page 2

Dave S · 2nd February 2006, 09:01 AM

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

tmblack · 3rd February 2006, 03:02 AM

Hello Dave,

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

Which circuits do you like better?

Tom

EE

Dave S · 3rd February 2006, 02:01 PM

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

tmblack · 4th February 2006, 06:09 PM

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

EE

forr · 4th February 2006, 08:06 PM

In case it can help, I still havef many of Duncan's articles published in Hifi-News.

~~~~~~~~ Forr

§§§

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2nd February 2006, 09:01 AM	#11
Dave S diyAudio Member Join Date: Mar 2003 Location: Searchin' for Sweet Singletrack	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

3rd February 2006, 03:02 AM	#12
tmblack diyAudio Member Join Date: Jan 2005 Location: UK	Hello Dave, I was intrigued by the balanced input which might help with hum. Which circuits do you like better? Tom EE

3rd February 2006, 02:01 PM	#13
Dave S diyAudio Member Join Date: Mar 2003 Location: Searchin' for Sweet Singletrack	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

4th February 2006, 06:09 PM	#14
tmblack diyAudio Member Join Date: Jan 2005 Location: UK	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 EE

4th February 2006, 08:06 PM	#15
forr diyAudio Member Join Date: Dec 2004 Location: Next door	In case it can help, I still havef many of Duncan's articles published in Hifi-News. ~~~~~~~~ Forr §§§