Black Lion Audio B173 500-Series Preamplifier

Brand New
$399
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Shipped From
Alto Music
Middletown, NY, United States
60,443
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About This Listing



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!



  • 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


Mic Section
  • Max Microphone Input Level: +1 dBu
  • Input Impedance: 200Ω
  • Gain: +12dB to +80dB
  • Equivalent Input Noise (noise floor): -103dB
  • THD+N (@ +4dBu output):
    • .072% @ +8 dBu Gain
    • .074% @ +29 dBu Gain
    • .082% @ +44 dBu Gain
    • .152% @ +60 dBu Gain
    • .709% @ +76 dBu Gain
  • Bandwidth (1kHz, 150Ω source, unweighted): 10Hz to 30kHz
Hi-Z Section
  • THD+N (@ +4dBu output):
    • .0045% @ +10 dBu
    • .0076% @ +15 dBu
Output Section
  • Max Output Level: +29dBu
  • Output Impedance: 600Ω
Power Supply
  • +24V provided by ultra low noise,
    custom power supply (500 series rack
    required)
Product Dimensions
  • 1 .5” x 6.5” x 5.25”
Product Weight
  • 1.2 lbs
Shipping Dimensions
  • 13” x 13” x 5”
Shipping Weight
  • 3 lbs

Product Specs

ConditionBrand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.learn more
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60,443