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Grass Polygraph DC Driver Amplifier 7DA D with Low Level DC Pre-Amplifier 7P1A. The pre-amp contains 2- ECC83's, the rest is solid state. Overall appearance is excellent for its age. Front panel excellent, markings excellent. Chassis is clean. I have no way to test it so it is sold as-is for parts or restoration. Measures 19"W, 12"D, 3.5"H. Item #91010

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