Nº33H
MONAURAL POWER AMPLIFIER
Each monaural Nº33H weighs in at 175 pounds (over 80 kg) and takes advantage of a vertically oriented industrial design that reduces the floor space the amplifier would otherwise require. Rated at 150 watts into an
Technical Background
Fully Balanced Power Supply: The Nº33H uses two independent, bipolar power supplies to support the fully balanced nature of the amplifier
from input to output. These are taken from a single 3.417 kVA custom transformer, using multi- ple taps to maintain the symmetrical nature of the two bipolar supplies. Since each amplifier is monaural, you can count on symmetry at the transformer for the noninverting and inverting sides of the same signal. This stands in contrast to “stereo” amplifiers which share a single trans- former between dissimilar amplifier channels, wherein crosstalk through the power supply pres- ents problems.
AC Regeneration: One of the most significant features of the Nº33H amplifiers is the presence of the AC Regeneration system, which siphons off a portion of the ± DC power from the main supply, using it to power an oscillator circuit that gener- ates pure sine wave AC. Having created this absolutely clean AC source, we then rectify it, filter it, and regulate it as you would expect in any high quality power supply. But because the AC power we began with was
