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Many people who own a 100-watt/non-master volume Marshall will remove two of the output tubes to achieve a more manageable volume from the amplifier. This isn't such a bad idea (other than the fact that you have to keep tabs on a pair of output tubes that aren't 'aging' at the same rate as the 'in use' pair), but a popular myth is that you must reset the output impedance selector to one-half of what your cabinet is rated for. This is 99% untrue. An 8-ohm load connected to an 8-ohm output tap should achieve full rated power and full bandwidth. A mismatch 'up' or 'down' will reduce the power output and the bandwidth. With a 'good' transformer utilizing high-temperature wire and 'properly' insulated between the coil stacks, no special care is needed to ensure safe limits of current through the tubes or transformer. You will achieve full wattage and the 'original' bandwidth by adjusting the impedance, but the 'alternative' has interesting possibilities. It's all up to your ears. If you aren't 100% comfortable about this procedure, play the amplifier and feel the shell of the output transformer. Did you get a blister? You may want to check Screen Grid voltages and bias currents

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