Why can't I build my own ARC LS-5 or CJ PV-12? - diyAudio
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Old 26th July 2012, 02:42 AM   #1
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Default Why can't I build my own ARC LS-5 or CJ PV-12?

Why can't I build the preamps I can't afford? The schematics and pictures of the circuit boards are available on the internet. What would be the stopping point? Sourcing correct transformers?

This is a serious question from a beginner.

Thanks,
Jim
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Old 26th July 2012, 02:50 AM   #2
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As far as the pv-12 the cap are the only thing special but you can use good polyprop or even teflon for big bucks . The circuit is not much more than text book the power supply regulator is advanced and was desigened about 30 years ago . the store will soon have great boxes to put them in . As for the ls-5 have not loked at the schematic .
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Old 26th July 2012, 03:00 AM   #3
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Default ARC LS-5 schematic

Available from ARC DataBase website: ARCDB - LS5

It is a completely balanced circuit with all XLR connectors with no RCA single ended connector at all.

preamp schematic:
Click the image to open in full size.

power supply schematic:
Click the image to open in full size.
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Old 26th July 2012, 03:54 AM   #4
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Quote:
Originally Posted by Triodethom View Post
As far as the pv-12 the cap are the only thing special but you can use good polyprop or even teflon for big bucks . The circuit is not much more than text book the power supply regulator is advanced and was desigened about 30 years ago . the store will soon have great boxes to put them in . As for the ls-5 have not loked at the schematic .
Thanks Triodethom. Does that mean I won't be able to duplicate the power supply regulator? What about the transformers? Any other problem with trying to build one?

Thanks...
Jim
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Old 26th July 2012, 03:56 AM   #5
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Quote:
Originally Posted by directdriver View Post
Available from ARC DataBase website: ARCDB - LS5

It is a completely balanced circuit with all XLR connectors with no RCA single ended connector at all.

preamp schematic:
Click the image to open in full size.

power supply schematic:
Click the image to open in full size.
I don't know if I want balanced or not, I don't really understand it. But is there anything about this preamp a rookie like me should not be able to duplicate with patience? What about the transformers?

Thanks a lot...
Jim
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Old 26th July 2012, 05:49 AM   #6
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There is nothing special or particularly worthwhile about either of these units. You can build better sounding clones by using better passive components and in particular a good quality switched attenuator for volume.

Nothing special about the transformers either. Any decent R-core with higher power rating will sound better than what the originals used.

Last edited by analog_sa; 26th July 2012 at 05:52 AM.
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Old 26th July 2012, 06:08 AM   #7
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Jim , you can do anything you set your mind to do.

Your question is the very question I had asked myself when I first started out many many many moons ago and it is the very same question that drives my passion for this hobby back then and today !!!!

Just sayin'.




jer
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Old 26th July 2012, 01:08 PM   #8
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Quote:
Originally Posted by river251 View Post
Thanks Triodethom. Does that mean I won't be able to duplicate the power supply regulator? What about the transformers? Any other problem with trying to build one?

Thanks...
Jim
Sorry if I was misleading . the regulator not that hard to build built one from the schematic 27 years ago it not hard. If you can build off a schematic no problem . I like the aikido at tubecad.com much better than the two you chose even the cj act series is not much of a circuit just very expensive parts . The Aikido has circuit boards for sale making it a lot easier for a first time builder . The store here at diyaudio has boards for power supply and soon boxes to put the pre in .
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Old 26th July 2012, 02:29 PM   #9
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Quote:
Originally Posted by river251 View Post
But is there anything about this preamp a rookie like me should not be able to duplicate with patience?
My question to you is that why are you so set on these two models? Just curious....
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Old 26th July 2012, 03:18 PM   #10
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Don't be set on performance by the cost of these two. The circuitry is mediocre at best.
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