Looking for a NAD 2140 schematic

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As the title says, I'm looking for a NAD 2140 schematic and/or service manual for this ancient classic. I'm also interested in hearing about any mods other users may have performed to their 2140/3140 amps-mine is working fine but I love to tinker. Any help would be much appreciated.
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.