| calvert73 |
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: |
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| calvert73 |
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!
RC |
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| gingertube |
RC,
Not exactly what you want BUT
SP6 , 8, 10, 11, 14, 15 schematics are here:
http://www.pi.infn.it/~federico/further.htm
I'd just grab copies of the SP8 and SP10 and hope that teh SP9 is somewhere in between.
Cheers,
Ian |
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| calvert73 |
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.
RC |
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| Toaster |
| 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... |
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| Valde |
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 ;)
Regards
Valde |
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| caliban |
| 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. |
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| caliban |
| Typo: 97 should be 87 |
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| Valde |
Caliban!
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
Regards
Valde
flemming.skov@nypost.dk |
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| analog_sa |
| quote: | Originally posted by calvert73
but my hand is itching!
RC |
Don't tell me you're itching to clone ARC's worst ever preamp when curcuits for LS25 & LS25Mk2 are available. |
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| Valde |
| quote: | Originally posted by caliban
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, I can't find the schematic anywhere. Do you still have the possibility to send me a copy? I would be very pleased then ;-)
Regards
Valde |
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| Brett |
| quote: | Originally posted by analog_sa
Don't tell me you're itching to clone ARC's worst ever preamp when curcuits for LS25 & LS25Mk2 are available. |
Why would you even bother with that? |
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| analog_sa |
| quote: | Originally posted by Brett
Why would you even bother with that? |
I wouldn't :) |
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| caliban |
| Valde, I sent the schematic on Feb 22. I can resend if if you did not receive it, please advise. |
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| Luke |
brett and analog_sa, if you were going to build a balanced valve pre, something with some gain and not rare silly price and availability tubes, which would you build?
My understanding is the arc ls25mkII is quite a good pre amp, but then that was reviews not listening.
cheers arthur |
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| Brett |
| quote: | Originally posted by Luke
brett and analog_sa, if you were going to build a balanced valve pre, something with some gain and not rare silly price and availability tubes, which would you build? |
Assuming no phono pre reqd, a balanced version of my 12B4 with siutable OPT or
http://www.raleighaudio.com/Figure_18.jpg
...but with ECC99, 6H30 or 6H6N and OPT adjusted accordingly. EL84 in triode with a sufficient amount of current would also be nice.
It all depends upon how much gain you want.
Without the input trans, Allen Wright's RTP3C front end could be added with a little tweaking of RIAA components to give phono capability and would come close to the last full function pre I built, and is similar to the next one I have planned. All my vinyl is stored at the moment and will be for some time yet, so it's way down on the to-do list. |
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| Valde |
| quote: | Originally posted by caliban
Valde, I sent the schematic on Feb 22. I can resend if if you did not receive it, please advise. |
Caliban, hmm I have not received this long awaited email
:bigeyes:
Last week there was a ADSL break.out in my area for 36 hours. so maybe I has been harmed by that.
With Regards
Valde
flemming.skov@nypost.dk |
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| caliban |
V,
I resent the schematics (6 pages) on March 2, 6:20 A.M. EST (USA). If you do not receive the email this time, let me know and we'll figure something out.
Make sure your spam filter does not bury it, sender is flatsixxx. |
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| Valde |
| quote: | Originally posted by caliban
V,
I resent the schematics (6 pages) on March 2, 6:20 A.M. EST (USA). If you do not receive the email this time, let me know and we'll figure something out.
Make sure your spam filter does not bury it, sender is flatsixxx. |
Caliban, this is very strange! I have not received your mail. Eventhough that I had received other emails this day ?!? I'm not aware that I have a spam filter, if so, it's administrated by the ADSL operator which is DK's biggest operator on this field and should manage this kind of files...
Do you send it direct to flemming.skov@nypost.dk ?
Thanks for your efford in advance... |
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| caliban |
| Yes, I did. I will try sending one page at a time to see if that works, stand by. |
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| caliban |
http://s53.photobucket.com/albums/g73/porporpor/
V -- I uploaded the schematics to PhotoBucket, they are slightly smaller due to the website constraints, but I think they will be large enough. Click on the image for a full size view.
This has to work. I have no idea why the email has not. |
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| Valde |
| quote: | Originally posted by caliban
http://s53.photobucket.com/albums/g73/porporpor/
V -- I uploaded the schematics to PhotoBucket, they are slightly smaller due to the website constraints, but I think they will be large enough. Click on the image for a full size view.
This has to work. I have no idea why the email has not. |
Thanks again for your effort, Caliban! I got it know :D
Valde |
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| Luke |
Hi Brett,
Ive thought about building allen wrights pre, need to buy the book first dont you? Ive read a few good things about his rtp3c.
It seems wrong to use transformers in a preamp, surely you can do as well if not better without this added expense? |
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| Brett |
| quote: | Hi Brett,
Ive thought about building allen wrights pre, need to buy the book first dont you? Ive read a few good things about his rtp3c. |
Nope, I've bought it but built from the schematic.
| quote: | | It seems wrong to use transformers in a preamp, surely you can do as well if not better without this added expense? |
Wrong, why? They work well, sound better than caps and give galanic isolation. Sure they can be a bit exxy, but so can caps and the RTP3 linestage is a difficult and potentially expensive build with 5 envelopes/channel. I preferred a similar line stage to what I suggested above to the RTP. Allen will no doubt disagree, but I've built both. |
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