Black Lion Audio B173 500 Preamp

Classic 1073 sound in 500 format
MFR# B173500
Black Lion Audio B173 500 Preamp
Black Lion Audio B173 500 Preamp Black Lion Audio B173 500 Preamp
or $12/month for 36 months 0% interest for 36 months**. 36 equal monthly payments required. Learn more
In Stock
Orders placed by 4:30pm ET M-F will ship the same day. Place your order before 4:30pm ET Mon-Fri and we will ship your items the same day.

To inquire if this item is available in one of our stores, please call 888.653.1184 or chat with us.

The B173 is one of the most “bang for your buck” preamps in existence, and is now available in the 500 series format. The Black Lion Audio 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!


  • 500 Series format (500 series rack required for use)
  • Cinemag Input Transformer
  • Edcor Output Transformer
  • 80 dB Gain
  • Hi-Z Input (passive, unbalanced)
  • Phantom Power
  • Phase Switch
  • Output Attenuator


  • Max Microphone Input Level: +1 dBu
  • Input Impedance: 200Ω
  • Gain: +12dB to +80dB
  • Equivalent Input Noise (noise floor): -103 dB
  • THD+N Mic Section (@ +4dBu output): .072% @ +8 dBu Gain; .074% @ +29 dBu Gain; 082% @ +44 dBu Gain; .152% @ +60 dBu Gain; .709% @ +76 dBu Gain
  • Bandwidth: (1 kHz, 150 Ω source, unweighted): 10 Hz to 30 kHz
  • THD+N (@ +4dBu output) Hi-Z Section: .0045% @ +10 dBu; .0076% @ +15 dBu
  • Max Output Level: +29 dBu
  • Output Impedance: 600Ω
  • +24 V provided by ultra low noise, custom power supply (500 series rack required)
  • Products Dimensions: 1.5 x 6.5 x 5.25 in
  • Product Weight: 1.2 lb
  • Shipping Dimensions: 13 x 13 x 5 in
  • Shipping Weight: 3 lb

Additional Information

Condition New
Unit Weight 3 lb
Chassis Module
Module Type 500 Series
Module Slot Count 1 Slot
Input Connectors Analog XLR
No one has written a review yet. Be the first!

Share Your Opinion

The best gear advice always comes from those who use it the most. That's where you come in! Let the pro audio world hear your voice with a review of the Black Lion Audio B173 500 Preamp. Once you submit your review, please check your email and verify your address to have it posted.

How do you rate this product?

Blog Posts

Have some questions about this item?

When it comes to getting the best gear, your tastes are probably pretty particular. Vintage King can help answer any and every question to help you make the right decisions for your sound. Fill out the form below and we'll be in contact with you shortly.

Free Shipping in the USA and 50% Off International Shipping! See terms.

* Required Fields