Ampeg B115R

This a homemade fusion of the Ampeg B15R preamp with the B100R 4 bands EQ.

Details

All the following section is based on the B115R_preamp_schema.pdf schematic.

Input:

• 12VDC @ ~600mA
• ~150mA of that is used for 12AX7/ECC83 heater

Extra:

• A long plate 12AX7 (JJ ECC803S) for V1 which adds more dynamics and improves the tonestack
  • V2 is a JJ ECC83S (normal plate)
• The trimpot can be a A1M or a B500K

Tools

• KiCAD
  • https://gitlab.com/kicad/code/kicad
  • https://github.com/KiCad
• DIYLC
  • https://github.com/bancika/diy-layout-creator
• LiveSPICE

Resources

• https://ampeg.com/support/files/Schematics/
• http://www.valvewizard.co.uk/index.html
• https://www.ampbooks.com/mobile/amplifier-calculators
• http://www.guitarscience.net/tsc/info.htm (tonestack calculator)