The B173 is one of the most “bang for your buck” preamps in existence, and is now available
in the 500 series format. The B173 500 not only delivers the beefy lows, buttery mids, and
polished highs of a classic 1073 preamp, but does so at a fraction of the price!
The preamp and line amp circuitry found in the B173 500 is identical to the original B173.
Not a single component or design feature was compromised while converting it to a
smaller package. As a result, the circuit boards are jam packed with all sorts of delicious
components, including a brawny Cinemag input transformer!
The power supply is the backbone of any preamp design, and can make a huge impact on
the overall sound and performance of the preamp. The +24V rail needed to power the B173
500 is painstakingly converted from the +/- 16V rails of a 500 series rack using a custom
DC-DC converter circuit specially designed to keep any unwanted noise or modulations out
of the signal path. Complete isolation is then achieved through the use of inductors, ferrite
beads, decoupling capacitors, power regulation, and a custom enclosure surrounding the
entire circuit.
The B173 500’s “Class A”, discrete circuitry combined with high-end components provide
a fresh approach to a classic sound that won’t disappoint. Thanks for your purchase and
continued support of Black Lion Audio!
INTRODUCTION
FEATURES
• 500 Series format (500 series rack required for use)
• Cinemag Input Transformer
• Edcor Output Transformer
• 80dB Gain
• Hi-Z Input (passive, unbalanced)
• Phantom Power
• Phase Switch
• Output Attenuator
User Manual
Summary of Contents for B173 500
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