The Locomotive Audio WT-72 is an all-tube single-channel mic/line and instrument preamp based on the legendary V72.
The Locomotive Audio WT-72 offers up to 56dB of characterful gain and uses the same AC/DC voltage feedback design as the original to deliver the necessary gain and stability. The first 36dB of gain is obtained by attenuating the signal to the first EF86 tube, while the final 20dB of gain is obtained by switching the AC and DC feedback. A quiet gain switching system that employs a unique muting system eliminates loud transients and ensures proper valve stability. As the gain is reduced, this design produces superior noise performance with lower noise.
The WT-72 has transformer-balanced input and output to replicate the original's unmistakable character. The audio is routed through two EF86 tubes to deliver up to 56dB of gain, while a plate choke provides large output swings with low distortion.