Hi Chris. Could you check the mH and current ratings of mid-range inductors on the older back plates that have the +3/0/-3/-6dB selector? I assume the -3/-6dB settings use a multi-tap inductor in a black box… I see a separate inductor for +3dB outside of the inductor box.
Also, do you know the current rating of the 4mH inductor on the latest version back plate?