For my JCM800 6V6 build I was planning to use an upright PT. I need the space inside the chassis. I thought it was fine if I just rotated the PT 90 degrees wrt the OT. However, I found a YouTube video ' Transformer Orientation' by DeepBueHarp clearly showing the benefit of a lay down PT. So I would like to use a lay down PT and raise it above the chassis. I can imagine some aluminium strips, or a small hammond chassis as a ' foundation'. Has anyone done this before? Other ideas? And secondly, where should I place the choke? Electrically it should be between the PT and OT. That way it would also screen the OT from the PT. But what about the effect of the field of the choke on the OT? A lot of amps have the choke on the other side of the OT. What would be the benefit of that? I know thousands of amp have been build with upright PT's and chokes al over the place. But this is a research/learning project for me, so simply copying stuff is not my goal. I'm also planning to test this (in reality), but I first need to know whether I need to buy a lay down or an upright PT.