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Presonus TubePre

Mono Tube Preamp


Presonus TubePre Figure 1The Presonus TubePre professional mono tube preamp features a dual-servo (no capacitors) gain stage that lets you boost the program signal to extremely high levels without significantly increasing the background noise, while offering rich and warm audio quality.

The 12AX7 vacuum-tube-based preamp includes a Gain control and a Tube Drive control that lets you decide how much signal to put through the tube. You also get 48V phantom power, a 80 Hz high-pass filter, a -20 dB pad and a polarity-reverse switch. It even sports an analog, backlit VU meter.

Thanks to separate instrument and mic inputs, the TubePre can serve as a direct box (DI) for guitars and basses. It's small enough to carry almost anywhere, although you also can rack-mount it using an optional 3UMR rack adapter.

Presonus TubePre Features:
• Dual-servo, 12AX7 vacuum-tube-based preamp
• Tube Drive tube-saturation control
• Gain control
• 48V phantom power
• 80 Hz high-pass filter
• -20 dB pad
• Polarity-reverse switch
• Backlit VU meter
• Clip LED
• One unbalanced 1/4" instrument input
• One balanced XLR mic input
• One unbalanced 1/4" line output
• One balanced XLR line output
• Compact 1/3U rack-mount chassis
• External 16 VAC power supply
• Optional 3UMR rack adapter

Presonus TubePre Specifications:


• XLR Impedance: 1.3k Ohms
• High Z Impedance: 1 Meg Ohm

Panel Controls:

• Tube Drive: 0dB to +20dB
• Gain: 3dB to +48dB
• Phase Reversal
• -20 dB Pad
• +48V Phantom Power
• 80Hz Rumble Filter


• Blue Backlit VU


• XLR Balanced: 51 Ohms Impedance
• 1/4" TRS Unbalanced: 51 Ohms Impedance


• THD+Noise (Unweighted): 0.05% at 0dB Tube Drive; 10% at 30dB Tube Drive
• Noise Floor: -98dB
• Signal To Noise: >95dB
• Power Supply Rejection: >98dB
• Amplifier Type: Dual-Servo

Power Supply:

• Type: Linear
• Input: 16VAC/1000mA (factory configured)
• Power: 16 Watts


• Weight: 5lbs.
• Dimensions: 5.5 x 5.5 x 1.75 inchess
• Mounting: Universal Rack Tray Insert
• Chassis: Steel
• Panel: Brushed Aluminum
• Sides: Cast Aluminum

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