Hi.Due to lack of confidence on others, i placed a new order at RS comp for some ST Tip3055(to-247). I believe tip3055 is good enough for JLH Class-A although no Ft spec in datasheet
I used the Bourns TIP2955/3055 in that package for a ESP project 3 clone amplifier I built for my HNC studies.
I don't know who acquired Bourns, but I expect the Ft of the ST is similar at about 2-3MHz
I used double the Transistors for a roughly 100W push pull amp, certainly one better for 4 Ohm loads, and a heatsink of about 0.5C/W maybe slightly less.