Last winter I built a 5f11 kit from mojotone, and built my own pine cabinet. Great amp. I’m finally getting around to the tweed covering so it’s all disassembled in my basement. While it’s opened up, I thought I might make a few upgrades. Going to install a bias pot for sure. What do you think about upgrading the OT? Allen or classic tone...is it worth doing? Also considering a master volume like Robinette posted for the 5e3, worth doing? I play a lot early in the morning before the house is up, thought it might let me drive the preamp a little harder. Any other changes I should consider?