 Non-Simulclass versions of the Mark III came in either 60w RMS with two 6L6s or 60w/100w with four 6L6s in the power section.Mark IIIs contain either four or five 12AX7 tubes in the pre-amp section, depending on if they have the reverb option.Simul-class Mark IIIs usually contain two 6L6s in the inner sockets and two EL34s in the outer sockets for 15w/75w use.