Radial Engineering PowerTube Tube Microphone Preamp, Class-A with Jensen Transformer

Radial Engineering's PowerTube is a high performance microphone tube preamplifier designed to be used with the Radial Workhorse and other 500 series modular racks. It features 100% discrete components for optimal signal transfer and utilizes a 12AX7 vacuum tube to deliver the excitement and character of a high-voltage vintage tube amplifier.

The design begins with a front mounted XLR for instant connectivity plus a recessed 48V phantom power switch for safety. Gain can be adjusted up to 55 dB, and when pushed hard can add a great distorted character and harmonics to the sound. This is supported with a full 10 segment LED meter for precise signal monitoring.

To add extra character; a control switch lets you set the PowerTube to 'Air' for added high frequency air such as when accentuating a vocal track or adding harmonic content to an acoustic guitar, while the 80 Hz high-pass filter eliminates excessive bass.

Features

• Made from 100% discrete electronics
• Variable input trim
• Fully variable gain control, presence, low cut
• Full 10-segment LED bar graph
• Equipped with a Jensen transformer

Specifications

• Audio Circuit Type: 100% discrete class A with 12AX7 tube drive
• Transformer: Jensen JT-115KE
• Frequency Response: 20 Hz - 20 kHz, +0/-1 dB
• Dynamic Range: >93 dB
• Gain: +75 dB when used with Workhorse (sold separately)
• Total Harmonic Distortion: 0.05%
• Intermodulation Distortion: 0.011%
• Input Connector: XLR
  • Input Impedance: 900 Ω
  • Common Mode Rejection Ratio (CMRR): >84 dB
  • Equivalent Input Noise: -128 dBu @ maximum gain
• Output Connector: XLR
  • Output Impedance: 200 Ω
  • Maximum Output: +22 dBu
• Data Compression: 235 mA
• Features: 180° polarity reverse, ground lift, HPF, level control, phantom power, OmniPort
• Conditions: For use in dry locations only, 5-40°C
• Dimensions (H x W x D): 9" x 2" x 6.5"
• Weight: 1.5 lbs