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Old 18th December 2005, 07:53 AM   #1
tmblack is offline tmblack  United Kingdom
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Default Ben Duncan's AMP 01

Is anyone familar with this RIAA amp, published by Hi Fi News and Revord Review in the 80's?

I would like to see the schematics if possible.
I recall he also had a passive amp in this series.

Tom

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Old 18th December 2005, 06:12 PM   #2
tmblack is offline tmblack  United Kingdom
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This designation is similar to the Analog Devices AMP01.
Did Ben Duncan use these ICs?

Would instrumentation op amps work well for the MM type cartridges?

Tom

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Old 18th December 2005, 06:50 PM   #3
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Default Re: Ben Duncan's AMP 01

Quote:
Originally posted by tmblack
I would like to see the schematics if possible.
Hi,

Audio Synthesis, www.audiosynthesis.co.uk supplies bound reprints of the AMP01 and AMP02 series of articles. I bought them a few years back. Don't see them listed on the website but may still be available.

James
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Old 18th December 2005, 07:45 PM   #4
tmblack is offline tmblack  United Kingdom
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I would buy the reprint but its no longer available.
its been a long time and I need to refresh my memory.
How does the amp 02 differ from the amp 01?
What chips do they use?

Thanks

Tom

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Old 21st December 2005, 08:35 PM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
Ben D. used opamps that seemed to be just reaching the market at that time. All VERY expensive.
By now most of these will be a lot cheaper both in actual cost and in real terms. I suspect a few of them can be replaced with better more modern alternatives.

Have you tried the library archive?
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Old 23rd December 2005, 07:48 PM   #6
tmblack is offline tmblack  United Kingdom
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No libraries around here carry issues that far back.
But I just need to know the topography used.
Was it a 2 op amp passive design?

Tom

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Old 23rd December 2005, 09:08 PM   #7
srh is offline srh  New Zealand
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Hi Tom,

The amp 01 is a 3 ic design with mixed active/passive riaa eq. It has/had switched gain to cater for mc and mm carts as well as an option for balanced/unbalanced input. PM me if you want more info on his amp 02 and passive pre articles.

Cheers,
Steve.
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Old 23rd December 2005, 10:43 PM   #8
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Quote:
Originally posted by tmblack
No libraries around here carry issues that far back.
But I just need to know the topography used.
Was it a 2 op amp passive design?

Tom

EE

If you know the issue in question you can order it from the Document Supply Centre in Boston Spa via your local library.
In London, The Science Museum library and the British Library both carry back issues of HFNRR going back to at least the 70's. The IEEE library might also carry it.

BTW, If you want to build the AMP02 phono stage tracking down the SSM2016 might prove tricky.
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Old 24th December 2005, 08:49 PM   #9
tmblack is offline tmblack  United Kingdom
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The SSM2019 should work well in place of the SSM2016, but I'm more interested in his reasoning than actually cloning the circuit.

IC's are much better and cheaper than in those days.

Tom

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Old 29th December 2005, 04:51 PM   #10
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I doubt this helps but here's some info about Ben Duncan's riaa-equalisation module.

http://mail.google.com/mail/?view=at...265c6d0caedd8d

PS I have a little more information,if only I could find it !
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