real load resistors

When measuring and comparing the output powers of audio amplifiers (especially at the high end of the audio spectrum) it is useful to have available a `real` load resistor, i.e. one which is a pure resistance with no parasitic induct-ance or capacitance. Carbon film re-sistors have a low self-inductance, but unfortunately are not commonly avail-able in the high power ratings required for amplifier testing. The highest rating normally available in a carbon film resistor is 2 watts, so a load resistor for testing a 100 W amplifier would need to be made up of 50 such resistors in series/parallel combinations!