Radial Space Heater Analog Summing Mixer

The Space Heater is an 8-channel tube overdrive that can be used as an analog summing mixer or as a multi-channel studio effects device, utilizing the tube circuitry for a range of effects from subtle warmth and grit to full harmonic distortion.

The Space Heater is a high performance summing mixer that allows you to blend tracks out-of-the-box in the analog domain, with oversized output transformers and vacuum tubes for vintage warmth and character. Eight mono input channels or four stereo pairs are available, with a heat switch on each pair to adjust the voltage on the 12AX7 tube - lower voltage settings starve the tube for a more pronounced distortion effect. Separate Drive and Level controls on each channel give you complete control over each tube circuit, providing a range of tones that allow you to fatten up digital stems or provide a distorted effect on vocals, guitars or drums.

Radial Space Heater Analog Summing Mixer Features

• 8-channel 12AX7 tube overdrive with summing mixer
• 35, 70, and 140 volt Heat switch
• Channel outputs allow for use on single tracks
• Transformer coupled outputs for vintage tone

• Space Heater Analog Summing Mixer1
• Power supply1

• Circuit TypeClass A tube gain stage with IC buffers
• Frequency response 20Hz – 20Khz, +0/-3dB
• Total Harmonic Distortion (THD+N) Variable
• Dynamic range 96dB
• Input impedance – Bypassed 50kΩ in parallel with your load device
• Input impedance – Active 100kΩ
• Maximum input +22dBu
• Gain+33dB@140V, +29db@70V, +27dB@35V
• Gain - Mix Bus6dB above individual channel output
• BypassFull Bypass
• Clip Level – Output +26dBu
• Output impedanceBalanced
• Outputs 180 Ohms
• Output Impedance - Headphone Out 15 ohms
• Output Impedance - Mix Bus Out 100 Ohms
• Common Mode Rejection -70dBu @ 55Hz
• Equivalent input noise-103dBu
• Noise floor - Maximum Gain -64dBu@140V, -66dBu@70V, -70dBu@35V
• Noise floor - Controls at 50% -70dBu@140Hz, -72dBu@70V, -76dBu@35V
• Intermodulation distortionVariable
• Unity Gain Control SettingDrive and Gain at “11 o’clock”
• Number of channelsEight channels
• Input Connectors ¼” TRS, DB-25
• Output Connectors DB-25
• Insert Connectors 8 x ¼” TRS Send, 8 x ¼” Receive
• Mix bus output XLR Low pass filter -5dB @ 40Hz, 6dB/Octave slope
• XLR configurationPin 2 +, Pin 3 -, Pin 1 GND
• Power Supply (Included) External switching type 100V – 240V AC, 1600mA output with 5 pin XLR
• Construction 14 gauge steel chassis and outer shell
• FinishPowder coat
• Construction 14 gauge steel chassis and outer shell
• Dimensions 17.5” x 6” x 1.75” (44.5 x15.25 x 1.75cm)
• Weight 8.5 lbs (3.8kg)
• Conditions For use in dry locations only between 5°C and 40°C
• Warranty Radial 3-year, transferabl