AR-10Pi crossover schematic from the original AR Drawing sheet

[fedeleluigi]

 Here is the AR 10 Pi schematic coming from a copy of an original AR drawing sheet. Unfortunately the copy I have is not complete and a part of the AR drawing sheet is missing.
I couldn't find this schematic in the "AR Drawings" section, so I hope it can be added to the other files somewhere in the Library in order to allow everybody to see it. I think it's a rather rare document even though, unfortunately, not complete.
I have scanned it as TIFF format then I've converted it to JPEG to insert it directly into this post. To get a higher resolution, save the attached file in Tiff format.

Differently from LST, in the AR 10 Pi the auto-transformer and the 3 dB step switches permitted the listener to have more flexibility with a total of 27 different combinations of driver output level (that is 27 different frequency responses) without using any attenuation resistor. The auto-transformer enabled the user to control bass output by a 3 step switch as well. Differently from midrange and tweeter, the woofer switch (Woofer Environmental Control switch) is actually not a 3 position +/-3dB step switch but a 0dB (4Pi), -5dB (2Pi) and -8dB (Pi) switch.

Luigi

PS: I had already posted this schematic in the Acoustic Research forum pages but I think that the most appropriate place is probably here.

AR10 Pi original schematic TIFF.tif

[menchs]

I am looking to replace my crossover capacitors after 40 or so years. Do you, or anybody else on the forum know the voltage requirements of the crossover capacitors?

Will appreciate your help...

menchs

[RTally]

7 hours ago, menchs said:

I am looking to replace my crossover capacitors after 40 or so years. Do you, or anybody else on the forum know the voltage requirements of the crossover capacitors?

Will appreciate your help...

menchs

The general rule is to replace capacitors with ones having the same or greater voltage rating of the original caps. Since modern caps generally have higher voltage ratings than older caps, that is not hard to do. For speaker crossovers, any capacitor with a voltage rating of 100 V or greater will be fine.

[scottie munoz]

On 7/23/2017 at 1:54 PM, fedeleluigi said:

 Here is the AR 10 Pi schematic coming from a copy of an AR original drawing sheet. Unfortunately the copy I have is not complete and a part of the AR drawing sheet is missing.
I couldn't find this schematic in the "AR Drawings" section, so I hope it can be added to the other files somewhere in the Library in order to allow everybody to see it. I think it's a rather rare document even if, unfortunately, not complete.
I have scanned it as TIFF format then I've converted it to JPEG to insert it directly into this post. To get a higher resolution, save the attached file in Tiff format.

Differently from LST, in the AR 10 Pi the auto-transformer and the 3 dB step switches permitted the listener to have more flexibility with a total of 27 different combinations of driver output level (that is 27 different frequency responses) without using any attenuation resistor. The auto-transformer enabled the user to control bass output by a 3 step switch as well. Differently from midrange and tweeter, the woofer switch (Woofer Environmental Control switch) is actually not a 3 position +/-3dB step switch but a 0dB (4Pi), -5dB (2Pi) and -8dB (Pi) switch.

Luigi

PS: I had already posted this schematic in the Acoustic Research forum pages but I think that the most appropriate place is probably here.

AR10 Pi original schematic TIFF.tif 2.78 MB · 24 downloads

Thank you so very much for the schematic I've looked everywhere you are the man

[fedeleluigi]

For those who want to restore the AR-10 Pi crossover, Rlowe's files can be very useful. He did an excellent work with the last update (AR10pi-CircuitNotes Version 1.1 Sep2014) and the 1026.pdf and 1027.txt files. You can download them from the old thread “ AR10Pi crossover schematics” : https://community.classicspeakerpages.net/topic/1520-ar10pi-crossover-schematics/?do=findComment&comment=58409

PS: Note that there is an error in the file extension of the 1027.txt file. After downloading it, in order to open it you need to change its extension from .txt to .pdf.

 

 

 

[fedeleluigi]

In order to make things easier I attached Rlowe's files to this post. The 1027 file extention has been corrected.

1026.pdf 1027.pdf AR10pi-CircuitNotes Version 1.1 Sep2014 (1).pdf