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Sidebar 3: Measurements The two-chassis TL-7.5 was a delight to test, both ergonomically and because it proved oblivious of every grounding scheme I tried between it and my test equipment. Someone has done their homework with respect to arranging the preamp circuit's grounding arrangement. Maximum voltage gain with balanced input to balanced output measured 25.25dB; unbalanced to unbalanced was 18.4dB, both figures slightly but inconsequentially lower than specified. Unity gain on the stepped volume control was "60" balanced, "69" unbalanced.
Vacuum Tube Logic TL-7.5 Reference line preamplifier Measurements | Stereophile.com