Hi Bjorn, regarding getting the right tone, etc. out of Butler Tube Driver, you mentioned that it needs powerful amp cranked up which is not very convenient in home studios. I already have a 100 watt Carvin XV-212 amp which I ended up not using since I bought my 15w Laney Cub. Do you think using a load box like Palmer PGA-04 or Messa Cab Clone allows getting all power tubes running hot to get that sound without shaking the foundation of the house? Did you bother changing the chip or input resistor?
How do you deal with buffer issue? Do you have it in the bypass loop? Do you use buffer both upsteam and downstream?