I'm going to be starting a build of a JTM45. I'd like to be able to have some things be switchable to the more high-gain, early 70s plexi specs. For example, I'd like to put a switch to switch between tube rectifier and solid state rectifier, and have two separate bias pots, so I can bias the tubes properly for each of the different rectifiers. I'm looking for some advice: 1. What is a good kit to use? I've used mojotone kits in the past and liked them (for parts-quality, not instructions, which were terrible, so I referenced the BYOC instructions a lot), but are there any other ones I should consider? 2. I'd like to be able to swap between EL34s and KT66s. Which transformer should I use for this purpose? Is it better to go with a transformer designed for EL34s if I want to be able to swap like this?