• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
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Audio Research AC21 cross over

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AntoineRobineau

Member
Joined 2005
Hi,
i have a vintage A.R. AC 21 cross over. i want to change the frequencie cut for 280 Hz but i don't have the schematic. Is somebody have experience with this machine ?

thank you
 

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