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Old 12th August 2018
Gear Guru
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Seventh Circle also makes a Jensen Twin Servo preamp. You can put the Hardy op amps in it. Not a 500 series, though. I've never used it, or a Hardy for that matter, so I have no idea how any of them compare. But, I am really interested in the answer to this question.

Originally Posted by Jim Williams ➡️
Hardy uses one opamp. The Jensen design cascades two.
The M1 is his single op amp preamp. The Twin Servo 990 uses two.
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Radial Jensen Twin Servo - Hardy?-screen-shot-2018-08-12-4.49.56-pm.jpg