Special model made exclusively for use with some later revisions of Gulbransen consoles J, K, and N.  Tibia channel switched between one 6×9 in the fast drum and a stationary 6×9.  Isomonically separated complex channel switched between 2 additional 6×9 speakers in the fast drum, and two stationary 6x9s.  –Special Thanks to Jimmy Williams for this information.

Amplifier Type	4 Channel Vacuum Tube
Output Power	65 Watts total
Drum	Rotosonic
Horn	None
Speeds	1 Speed (Stop/Tremolo)
Interface	Custom