JE’s 1×12 PP-18 combo

For JE’s 1×12 18W combo, he opted to adapt the layout so that the valves hung downwards – i.e. at right angles to what would be the chassis’ back panel. This means fitting them into a tighter space than they would otherwise take up, but JE found no problems. A side benefit is that there’s more space for the turret board and its associated wiring.