Concept amp bass know

[Flipper245]

Hey everyone. Just picked up a concept hp2000 sub amp. What a beast! Need bass knob though and can't hardly find any info on concept let alone a knob. Does anyone know if knob from another brand will work or where I might be able to find a concept knob? Looks like the typical phone jack style. I don't want to resort to the rca style universal.

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