hifi engine

Musical Fidelity E1 amplifier

Hi Hope someome can help me. try to repair a faulty E1 amplifier. output have large DC offset both channales . 3-4Vdc, all transistors seems to be OK , also can anyone confirm what output transistor is the MF special . are they just nornal NPN Bipolar, any changer they are Darlinton type regrads a circuit diagrams will be apprciated.