One shows transformer # 3-4pt and another # 3-6pt. Whats the difference?
3-4pt (40 watt EL 34 based amps with 7199 pi tube) actually physically smaller , 3-6pt would be the 60 watt KT88 or originally 6550's powered amps. Big as Melons....
SUNN made 40 watters and 60 watters in identical looking packages like my 40 watt Solarus Head became a identical looking 60 watt only model a few months after.