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calvert73 2nd September 2006 02:48 PM

Audio Research SP9 Circuit Diagram HELP!
Hi, I'm looking for a circuit diagram for the ARC SP9 ideally all 3 versions with parts lists, I'd be glad to pay even for a good scan via e-mail.

RC :dead:

calvert73 7th September 2006 12:32 PM

SP9 Line Circuit?
even just the line section. I dont mind ordering one from ARC via snail mail (forget about AS in the UK prices are just silly!) but my hand is itching!


gingertube 11th September 2006 04:42 AM

Not exactly what you want BUT
SP6 , 8, 10, 11, 14, 15 schematics are here:

I'd just grab copies of the SP8 and SP10 and hope that teh SP9 is somewhere in between.


calvert73 17th September 2006 11:26 AM

Not Quite!
Thanks Ian,

the SP8 and SP10 (which I've owned) are all valve the SP9 is a hybrid circuit but quite different to the SP11.


Toaster 27th September 2006 04:25 PM

Hi, I have the circuit for the SP9 MK1- ARC thoughtfully include it with the manual. Bear in mind though that some of the fets are ARC own brand and equivalents are not listed, so it depends what you're trying to do as to whether the circuit'll do you any good...

Valde 22nd February 2008 08:16 AM

Hi Folks and mainly Toaster,

I'm in the same situation for the need of a circuit diagram for a SP9 mkI.

The ARC dealer in Denmark won't handover a sheet to even if I pay for it.

My ARC SP9 has a modified phono section. The 2 big transistors (in a TO-220 housing) in the mid of the phono stage has been removed a modified with one EC91 in each channel. Somebody claims that this is in the powersupply section of the phono section but I doubt. So I will be very pleased to see a circuit diagram for the SP9 (the original version, but a later version will also be apreciated ;)


Luke 22nd February 2008 08:19 AM

check out the arc database

caliban 22nd February 2008 09:11 AM

I have the schematic. if you don't get if from anyone else, let me know and I will photograph it and send it to you. Mine is dated 4-20-97, it's an original SP9.

caliban 22nd February 2008 11:22 AM

Typo: 97 should be 87

Valde 22nd February 2008 11:35 AM


Wow, I would be very pleased to get an email from you with the scanned circuit diagram for the SP9 :)

The web side Luke mentioned does not include the SP9, SP1->8 and SP10-> so again I will be very happy to receive your email


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