Radial Space Heater 8-Channel Summing Mixer and Tube Drive

The Radial Space Heater 8-Channel Summing Mixer and Tube Drive is a state-of-the-art analog summing mixer designed to bring vintage warmth and character to your digital audio productions. This high-performance piece of equipment provides eight mono input channels or four stereo pairs, allowing you to seamlessly blend tracks out-of-the-box in the analog domain. At the heart of this versatile mixer are oversized output transformers and 12AX7 vacuum tubes, which together provide a rich, warm sound that is often missing in digital recordings. Whether you’re looking to fatten up digital stems or add a distorted effect to vocals, guitars, or drums, the Space Heater’s comprehensive control options give you the customization you need.

With separate Drive and Level controls on each channel, you can have complete control over each tube circuit. Additionally, the heat switch on each pair of channels allows you to adjust the voltage on the 12AX7 tube, providing you with a range of textures, from subtle warmth to more pronounced distortion effects. The transformer-coupled outputs contribute to the unit's vintage tone, giving your mixes a character that stands out. Constructed with a 14-gauge steel chassis, the Space Heater is built to last, ensuring reliable performance for years to come.

Key Features

• 12AX7 vacuum tube overdrive & summing mixer
• Heat switch adjusts voltage applied to each tube
• Individual outputs to use as an 8-channel effects insert
• Transformer-coupled outputs for vintage tone

Specifications

• Audio circuit type: Class-A tube gain stage with IC buffers
• Number of channels: 8
• Frequency response: 20Hz - 20Khz +0/-3dB
• Dynamic range: 96dB
• Gain: +33dB@140V +29db@70V +27dB@35V
• Clip Level: +26dBu
• Input Impedance: Bypass: 50k in parallel with your load device | Active: 100k
• Output Impedance: Balanced Output: 180 | Mix Bus: 100
• Common Mode Rejection Ratio: -70dBu @ 55Hz
• Equivalent Input Noise: -103dBu
• Noise @ Max Gain: -64dBu @ 140V -66dBu @ 70V -70dBu @ 35V
• Maximum Input: +22dBu
• Construction: 14 gauge steel chassis and outer shell
• Size (L x W x D): 17.5” x 6” x 1.75” (44.5cm x 15.25cm x 4.45cm)
• Weight: 8.5lb (3.8kg)
• Shipping size (L x W x D): 22” x 10.375” x 4.5” (55.9cm x 26.4cm x 11.4cm)
• Shipping weight: 9.5lb (4.3kg)
• Power: External switching type 100V - 240V AC, 1600mA output with 5 pin XLR
• Conditions: For use in dry locations only between 5°C and 40°C

Package Contents

• Radial Space Heater 8-Channel Summing Mixer and Tube Drive
• Power Supply
• User Manual