(Prototype) JTM45 Small Box R/T Series II with Tube Buffered Serial Effects Loop. It features the R/T mod on a (on/off) volume 2 pull out and a transparent and low noise tube buffered loop in series. This amp was built from the ground up by me with Classic Tone transformers. I biased up a set of Gold Lion KT66's for this one. I also installed a new custom MV mod in this amp head and two 3 way switches on the back of the amp as well. One is (tone stack) switch and the other is a V2a cathode switch. Great for fine tuning many different types of guitar tones. Give me a little feedback, let me know what you think of the demo video.