![]() ![]() The '3886 is not good for the expected 80 Watts. Much more protection was soon seen to be "essential" for products which would come back for repair at your expense. In stage amps, this means the first shorted speaker cable is an amplifier death. The other transfo-drive design has no protection at all. Speaking of protection: that Marshall plan has over-current but not SOA protection. In planar, a falling hFE is also a lower-cost product, so they ape the old hFE curve when selling as a '3055. But the old-old datasheet for '3055 shows hFE falling quite badly above a few Amps, and I think many old designs relied on this to protect (ha) against destruction. New-'3055 on planar process may have higher low-current hFE. Original-recipe "baked potato" '3055 had a base-width bigger than an SMD and correspondingly low hFE.
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