A tube-based Active tone control built on a PCB using a pair of 12AX7 tubes. Intended for use between RIAA Phono stage and integrated amplifier, the circuit was modeled in LTSpice before being built mostly from parts already on hand.



The project was built in an aluminium case with a clear acrylic top to give a good view of the internals.

Comments

• sqirmy
• 11 December 2017 at 04:53PM
• hi Anam thanks for sending the photo's I am suitable impressed you have made a great job of that project
  regards
  Ian