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I have two sony tc-788-4 reel to reel decks and i went and did the full e-recap on one of them. After doing step by step calibration and adjustment i run into the problem of adjusting the record eq. I am not sure what is wrong.

The voltages do not change when i do the adjustment. I even try to removed the metal core completely out and there was not change in the v readings. The same thing for both units. As the result i get a lot of high freq and low voltage readings on low freq on my recordings. Any idea what could be causing that.