• Black Lion Audio BLA B173 500 Series Microphone Preamp

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!

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


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

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Black Lion Audio BLA B173 500 Series Microphone Preamp

  • Brand: Black Lion Audio
  • Product Code: Black Lion Audio BLA B173 500
  • Availability: In Stock
  • $499.00
  • $399.00

  • Ex Tax: $399.00

Tags: Black Lion Audio BLA B173 500 Series Microphone Preamp