Locomotive Audio Model 14B

The Real Sound of Vari-Mu Tube Compression at Your Fingertips


Locomotive Audio MODEL 14B: A Vari-Mu Compressor That Will Make Your Vocal Sit Perfectly

Make Your Vocals Sound Huge and Upfront with Presence and Excitement

The Real Sound of Vari-Mu Tube

Compression at Your Fingertips

Just like its popular vintage inspirations, the Gates Sta-Level, UA 175B, RCA BA-6A, and Collins 26U, the results are a sound that cannot be replicated with any other method of gain reduction.

The Locomotive Audio 14B delivers!


Super premium  MuMetal shielded  input and interstage transformers


Fast UA 175B attack meets smooth Gates Sta-Level Output


Adjust & cut the low frequencies that trigger compression


Use the 14B aggressively on your stereo room mics and overheads or gently on your mix bus


  • Stereo Link switch

  • Sidechain Low Cut filter control: Off and 70-350Hz

  • Hard-wire bypass switch

  • Compression turned off with full counterclockwise attack position, switching to line amplifier

  • Two position Compress-Limit Switch

  • Two position VU meter switch: Gain Reduction – Output

  • 6BC8 balance adjustment on the interior of the unit

  • Custom Sifam backlit VU meter

  • XLR input and output connections

  • Custom MuMetal shielded input and interstage transformers

  • Custom output transformer

  • Hand-built in USA

  • Heavy 16 gauge steel chassis

  • 115v/230v AC mains option on rear

  • Lifetime warranty parts and labor

Technical Specs

  • Tubes: (1) 6BC8, (1) 12AY7, (2) 6V6s

  • Input load impedance: 5kΩ

  • Output impedance: <1kΩ

  • Variable Attack: (300 µS – 20 mS)

  • Variable Release: (100 mS – 2 Sec)

  • Compression (4:1 ratio) or Limiting 10:1 ratio)

  • Frequency response: 20Hz-20kHz

  • THD+N: <1%

  • S/N ratio: >70dB

  • Dimensions: 19″w x 3.5″h x 10″d (2u Rackspace)

  • Shipping Weight: 20 lbs.

  • Power Consumption (120/240VAC): 42 watts


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