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Copley DC Servo Amplifier model 24 replacement?

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We have one of the attached Copley DC Servo Amplifiers. It is not functioning and we need to find a replacement. Anyone can suggest a proper replacement?
It drives a DC motor (90-110V DC and 20A). Motor turns back and forth from a "H" power bridge using a triangle shape current when up and down buttons pressed. Feedbacks are motor speed taco signal and a sample signal from motor current (across a 0.05 ohm 25W resistor, yellow aluminium casing) plus an adjusting potentiometer for setting initial speed.
 

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