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Sphere 920
Graphic Equalizer
by Jon Erickson at Helsing Audio
Graphic
EQs from the late 70's. The 920 modules are the hotrodded
version of the 900 series. 11 Bands of inductor equalization
with thumbwheel high pass filter, switchable peaking or
shelf on the highest and lowest bands, phase reverse with a
Reichenbach inductor for each band including the thumbwheel
filter. The modules have the "optional" booster amplifier on
each card which allows it to happily drive an output
transformer. The transformers are original Sphere and the
modules are built from all discrete components. The extra
amp and transformer acts like the bus amplifiers in the
original console adding drive capability and some nice
transformer character and noise isolation. Suitable for
tracking, mixing and mastering.
