Built this kit a few years ago and it's a nice sounding amp and solid pedal platform, but it is not a JTM45. Not even close. Recently purchased a Budda SD30 so the high gain territory is covered. So I got looking at the TubeDepot JTM45 schematic versus the original Marshall circuit. Wow, not even close. The TubeDepot design is a mix of a JTM50 and some later component values here and there. The only thing JTM45'ish about Robert Hull's design is the tube rectifier. When I have a bit more time I'll list what the TubeDepot kit used and what the real JTM value was. Purchased some nice components from Valvestorm, need a few more but for the most part it's almost there. The original build; Newly installed components; The kit was designed for EL34's. But the problem with this kit is the high B+ voltage at ~490V. The assembly manual stated it should be 480 V but most people that have built this kit state it's a bit over 490V. The original running KT66's are around 450V from what I've seen on line. This kit will eat EL34's with the stock 470 Ohm grid resistors at about a rate of once a year with moderate home playing. The 470's get stressed and have to be changed as well. Reading online, many kits use 1K resistors to alleviate the issue. The g2 voltage on Pin 4 is pretty high for modern tubes. Will be trying a set of 6CA7 tubes this time as they are suppose to be a hybrid of the EL34 and 6L6. If I like what I'm hearing I may get an OT for KT66's and make the full changeover. Will update this weekend. Would also appreciate any experiences other people have had with their TubeDepot JTM45 kits.