Knif Audio V804 Pre – 4 Channel

Knif Audio V804 Pre 4 Channel is a high-end vacuum tube microphone preamplifier that delivers ultra-low noise, high headroom and high gain through a two stage minimalist pentode design with Lundahl transformers and optional ultra-low capacitance DI input.

Historic Inspiration with Modern Execution

Knif builds the V804 Pre around the classic West German engineering principles of the 1950s while updating the architecture with contemporary components and precision construction. The input stage uses the revered Telefunken EF804S NOS pentode combined with a high step-up ratio Lundahl transformer so the preamplifier achieves both exceptional sensitivity and tonal integrity. Engineers who value vintage character gain the signature pentode immediacy, while the modern transformer design keeps bandwidth wide and noise extremely low.

Dual Stage Pentode Topology

The V804 Pre runs two tube stages, each based on carefully selected pentodes to achieve very high gain without sacrificing clarity. The first stage uses the EF804S to establish low noise performance, while the second stage employs an SQ grade E180F pentode to add authority and musical density. Lundahl couples this output stage to the outside world with a silicon iron core transformer, which contributes gentle thickness and smoothness at the top end. This transformer design also stabilises the low frequency response and improves transient delivery.

Gain Structure and Control

The unit offers gain selection in 4 dB increments through an Elma rotary switch so the engineer can set precise levels without drift or instability. The lowest gain steps activate an automatic 20 dB pad which protects the input stage and lets high-output sources remain clean and controlled. The signal path avoids electrolytic capacitors entirely so the transient structure remains fast, open and unconstrained.

Optional High Performance DI Input

Knif offers the V804 Pre with optional DI inputs featuring only 15 pF input capacitance, a value equivalent to roughly one foot of premium instrument cable. This extremely low capacitance preserves the highest harmonics of guitars and other Hi-Z sources so the instrument retains crisp articulation and extended treble detail.

Performance Profile

The V804 Pre 4 Channel achieves noise performance comparable to the finest solid-state microphone preamplifiers while maintaining the harmonic depth and dynamic headroom associated with true high-voltage pentode circuits. The minimalist two stage design brings rare sophistication to tube preamplification and creates a signal chain capable of authoritative gain and immaculate fidelity.

Why Choose Knif V804 Pre 4 Channel

• It provides authentic tube character without sacrificing the low noise expected in modern engineering.

• It adds musical weight and clarity to any microphone while remaining precise and controllable.

• It brings vintage West German pentode tone into a reliable, modern, studio-ready format.

• It elevates guitars and other Hi-Z sources with exceptional DI transparency.

• It offers a long-term professional solution built for mastering, tracking and high-end recording.

• Four channel high-end vacuum tube microphone preamplifier
• Two stage minimalist pentode design
• Telefunken EF804S NOS pentode input stage
• SQ grade E180F pentode second stage
• Lundahl input and output transformers with silicon iron core
• Very low noise and very high headroom
• Gain steps in 4 dB increments via Elma rotary switch
• Automated 20 dB pad on lowest gain settings
• No electrolytic capacitors in the signal path
• Optional DI input with only 15 pF capacitance

This item, like everything we supply, comes with the complete support of our expert team. Our excellent technicians have been specifying, building and supporting studios for over twenty years. If you have any problems with installation, setup or everyday use, they’re never more than a click away, and always happy to help.

You can contact them here.