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On my Magnum 6000, there are 2 pink 2 pin jumpers (near the main relay).  One is a "low" drive and the other is a "high" drive (3dB).  That gives you 4 different drive levels that can be set internally with the 2 jumpers.  Active class A bias, 5 pole Chebyshev output filter, keying jack, cooling fan.  Super clean amp.