Guitar Amp Schematics - wwwubestore Guitar Amp Schematics. Here we've listed our collection of guitar amplifier schematics. All are available for free download. If you need a guitar amp schematic for your amp repair that is not listed here, contact us and we'll try to locate it. Guitar Amp Schematics - AudioTinker Free Guitar Amp schematics in PDF format. 2W Tube Guitar Amplifier, 12AX7 & 12L8GT Single Ended This is a low power Guitar tube amp suitable for practicing, recording or miking through a PA system.