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Old 1st January 2013, 03:22 AM   #1
terfyo is offline terfyo  Singapore
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Default Audio Research LS22 DIY

Hi all,

For the new year of 2013, I would like to state my new year resolution; I am going to build an Audio Research LS22 pre-amp from scratch.

Schematics can be found on the Audio Research unofficial database.

Any words of advice for a beginner?

Regards,
Terfyo
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Old 9th February 2013, 04:23 AM   #2
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I bought 2 of them, personally, I would go for easier.
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Old 9th February 2013, 07:23 AM   #3
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Gee, what made you pick that particular circuit? I can only scratch my head in wonder looking at it: equivalent performance can be achieved by half the tube count. Marketing considerations took over?
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Old 9th February 2013, 07:38 PM   #4
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I have to agree, this is such a difficult circuit for a new person. Start small, keep it reasonable... Maybe a curcio daniel? maybe a bottlehead kit? Like I said, I own two of these, they're fairly complex...
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Old 31st May 2013, 03:30 PM   #5
terfyo is offline terfyo  Singapore
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Well, it may seem difficult. I have soldering skills and experience.

My only concern is with the availability of the components used to build the unit.

I am afraid that when I start building one, the availability of components is a hindrance.

Possibility?
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Old 15th October 2013, 10:51 PM   #6
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There's nothing in them that would be difficult to find.
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Old 15th May 2014, 12:47 AM   #7
terfyo is offline terfyo  Singapore
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Hi all,

I'm sorry to have disappeared for a year. Well, since the time I had decided to build the LS22, I bought a LS8 instead. Really, go for the easy.

Any positives on the LS8?

Cheers.
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Old 15th May 2014, 07:03 PM   #8
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The LS22 is too complicated for its own good when they could use half of the tubes, as "analog_sa" pointed out, to get the same result and less parts in the signal path and possibly better sound.

Click the image to open in full size.

A more simplified circuit can be achieved:
Click the image to open in full size.

What's curious is that in the later more expensive model LS25, they did exactly that. If you have to copy their circuit, the LS25 is a better choice. After the LS25, ARC decided to go hybrid from that point on, so it's their last all tube line stage in the LS series, besides the Reference series.

Click the image to open in full size.
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Old 16th May 2014, 03:19 PM   #9
Ketje is offline Ketje  Belgium
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Unless you use a delayed power-up ,there is +180V on the grids of tube2 at the start(tube is cold then).
Not a good idea.The two diodes prevent it.Ones the tube conducts the diode is blocked as if it isn't there.
Mona
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Old 16th May 2014, 08:12 PM   #10
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Quote:
Originally Posted by Ketje View Post
Unless you use a delayed power-up ,there is +180V on the grids of tube2 at the start(tube is cold then). Not a good idea.The two diodes prevent it.Ones the tube conducts the diode is blocked as if it isn't there.
Yes, understood. I was reusing the ARC schematic and modified from it and indeed they use timer power supply in the stock circuit.

Original ARC LS-22 schematics:

<schematic of signal circuit>

<schematic of mute & switching>

<schematic of power supply>
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