Michael, that would depend on what the original specs of the B-3000 were and whether it was still in good enough condition to deliver those specs. If it can in fact deliver 140 clean watts then it should be audibly identical at precisely equal levels to your 1015, which has similar power capability. The ideal for an amp is to be "A straight wire with gain", i.e. something that doesn't change the signal in any way except to make it stronger. That ideal can't be entirely achieved, but audio technology has reached the point where even relatively inexpensive units(e.g. your 1015)produce transparent amplification within their design limits, with audibly flat frequency response and inaudibly low noise and distortion. That degree of perfection is all that's necessary and spending more can't bring audible improvement.
