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Old 15th December 2017
Lives for gear
cheu78's Avatar
Yep these are class AB output amps.. (B638) draw less current and generate less heat..afaik.
and I believe they mount a different xformer than the class A units.. but don't quote me on that..
Imho they still sound good, a bit "cleaner" than their class A predecessors..

I'd ask Geoff Tanner, he will provide complete and correct information