I was recently presented with another interesting amp build and this time it was a 5F8A high power tweed Twin, but the customer wanted it in a LunchBox head. So after some thought I figured out I could fit the circuit into my 16×8 chassis enclosure so I committed to the build. When everything was said & done the amp turned out be be a very nice fit in that chassis, and it really was a tone monster with a loud, throaty growl & bark when it got pushed. I also added individual bias points so each tube’s bias can be measured just to make sure that each pair match or even the entire quad. I’ll be waiting to see if the owner sends any sound clips to share but in the meantime here’s some of the build pics.