![]() A simplified solid-state op-amp circuit is shown in fig.1. (Does that date it, or does it?) It combines several active devices to produce a DC-amplifying package having, in its "perfect" form, infinitely high input impedance, infinitely high gain at DC, and zero output impedance. The op-amp (for operational amplifier) circuit module was originally intended to perform simple mathematical operations in all-tube analog computers. Why, then, is Stereophile publishing a review of an op-amp–based power amplifier? Read on. They are designed around op-amps (felt by many to be generally poor-sounding), they have scads of negative feedback (which is perhaps why op-amps sound bad), and they have only a moderately hefty power supply. To high-end audiophiles, the Boulder 500 amplifier and its less expensive derivative, the 500AE (Audiophile Edition), would not seem to be "high-end" designs.
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