On
Used to turn on (or bypass) each of the four channel sets.
Bus
Sends the channel set to the stereo mix bus and headphones.
Drive
Outer control on each concentric pot sets the level going to the tube drive circuit.
Heat
Sets the B+ voltage going to the 12AX7 tube with 35, 70 or 140 volts for more or less distortion.
Level
Sets the output from the tube drive - acts like a master volume on a tube guitar amp.
Tube Drive On
Activates the tube drive – may be bypassed to compare wet versus dry or revert to the transformer coupled signal path.
HPF
High pass filter gently rolls off low frequency resonance below 40Hz to remove excessive bass.
Mix Bus
Turns on the XLR outputs. Used to adjust the summing mixer output level.
Headphone
Stereo 1/4" headphone output with level control.
Power
Turn the Space Heater off to conserve tube life and reduce power consumption and heat.
Power
5-pin locking XLR connection for the external power supply.
Link
Stereo ¼” TRS link in/out bus combines 2 or more Space Heaters together for 16x2, 24x2 or 32x2 tube summing.
Stereo Sum Outputs
Provide left and right summed outputs for the most luxurious old school analog character.
Ground Lift
Recessed switch lifts pin-1 on the two XLR outputs to help reduce hum and buzz caused by ground loops.
D-Sub Outputs
25-pin D-sub is used to send all 8 transformer isolated channels back to the mixing console or workstation.
Send
Eight ¼” TRS balanced sends feed the post tube signal to an external processor or may be used as additional outputs for parallel processing.
Receive
Eight ¼” TRS balanced receive jacks bring the signal back to the Space Heater and routes it to the D-Sub output or stereo mix bus.
D-Sub Input
25-pin D-Sub follows the Tascam/ProTools standard and is wired in parallel to the ¼” jacks.
Inputs 1-8
Eight ¼” TRS balanced inputs for easy connection to the Space Heater.
