Operating instructions

The centre piece of the “Hellborg Amp System” is the Preamp.
The input is a combined ¼”/XLR jack providing both low (XLR) and high (¼”) impedance. The input jack is followed by an
input transformer. This imparts galvanic signal isolation and the sweetness for which good transformers are known. The
EQ section provides shelving EQ for high and low band and an inductive (coil based) EQ for the mids with stepped (fixed)
frequency and continuously variable gain. Choices of frequencies are as follows: 110, 300 and 800Hz for low mids, 1.5, 3
and 5kHz for high mids. All transformers and coils are optimally shielded in MU-metal housing. The DI output amp is dri-
ving a carefully configured output transformer for the warmest recording or PA sound.
Safety Appliances
Warning:
High Voltage inside. To prevent electric shock do not open cover. Refer servicing to qualified service personnel.
To avoid fire hazard, replace fuse with same type and rating. To avoid electric shock hazard, do not operate this equipment
in rain or wet environment.
PREAMP
PREAMP
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