As a service to our readers, we're providing the LTspice files used in Dr. Dyer's article on simulation of the 12AX7 and the K2-W vacuum-tube op amp. 1. The model for the K2-W is established as a ...

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January 5, 2026 • D.C. police officers experienced some of the most intense violence during the attack on the U.S. Capitol on Jan. 6, 2021. We sat down with two of them to rewatch their body camera ...