Weight Tank WT-COMP  From Weight Tank


Weight Tank


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What We Think

Locomotive Audio are generating some buzz with their new Weight Tank Tube Compressor & Mic Preamp. This Variable-Mu Compressor combines two Tubes (6BC8 & 12AU7) with three Transformers (Input, Interstage & Output) to achieve a smoothly-colored, vintage sounding compression that adds a ton of thickness. It also holds together quite well at high gain-reduction levels. The build quality is hefty, (looking and feeling like a piece of vintage gear) while the price tag is not.

Manufacturer's Description from Weight Tank

The Weight Tank Compressor will put a stamp on any material run through its circuitry. The smooth and euphonic sound of soft-knee vari-mu compression paired with thick, distinct and colorful harmonic saturation makes the Weight Tank Compressor very unique. 

Unlike its cousin, the Locomotive Audio 14B, which buffs your sound to a glossy sheen, the Weight Tank Compressor offers darker tones while adding huge vintage heft to your audio.


Three all-steel transformers deliver big, thick, colored results


Audio passes through two vacuum tubes for smooth warmth 


Backlit meter displays gain reduction accurately 


Variable attack & release timing allows for great flexibility


When run in “Round” mode, a smooth, sweet and pure tone will result. If switched to “Drive” mode,  an enhanced harmonic structure and overall driven tone will result.



 ♦ XLR input and output connections​

 ♦ Stereo Link 1/4" TS jack on rear

 ♦ 6BC8 and 12AU7 tubes

 ♦ Stereo Link switch​

 ♦ Hard-wire bypass switch​

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

 ♦ 6BC8 balance adjustment on interior of unit​

 ♦ Custom backlit Gain Reduction Meter​

 ♦ Steel input, interstage and output transformers​

 ♦ Hand-built in USA

 ♦ Heavy 16 gauge steel chassis​

 ♦ 115v/230v AC mains option on rear​

 ♦ 2-year warranty parts and labor


Weight Tank


Tubes: (1) 6BC8, (1) 12AU7

Input load impedance: 5kΩ

Output impedance: <1kΩ

Variable Attack: 12 mS - 50 mS)

Variable Release: (200 mS - 2 Sec)

Compression ratio 3.5:1

Frequency response: 20Hz-20kHz 

THD+N: <1% Round || >5% Drive​

S/N ratio: >70dB

Dimensions: 19"w x 3.5"h x 10"d (2u rackspace)

Shipping Weight: 20 lbs.

Power Consumption (120/240VAC): 25 watts