Audio Research SP9 Circuit Diagram HELP!

[caliban]

Yes, I did. I will try sending one page at a time to see if that works, stand 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.

 

[Valde]

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

Valde

 

[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?

 

[Brett]

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.

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.

 

[Humanjava]

Trying not to drag up such an old thread but I was looking in the schematics, specifically in the power-supply section in regards to voltage change.

Is there dual taps for both 50 and 60Hz voltage frequencies? What about going from a 110volt country to a 220volt. I have my SP-9 maybe being sent here to me here in Germany from Canada and wonder if this will work, or a step down transformer may.

thx
Shamus