As of January 2025 the ATU are fully assembled and no longer supplied in kit form. If you ATU has the Toroids already on the PCB use the 'Installation Manual' below NOT the 'Assembly Instructions'
We've taken the retrofit instructions out of the assembly manual so if you are installing the ATU in a pre-Rev G - S/N < 1400 - older than 2015 amp, contact us for retrofit instructions.
All ATU kits shipped since March of 2017 are Rev D kits. If you are assembling an older Rev C kit contact us for the Rev C instruction manual.
Firmware V2.1 has updates for the Hardrock-50+ 100W upgrade.