Вот, уже их словами, про "примитивность" авионики МиГ-25.
"A final indication of what may be Soviet EMP awareness is the case of the Foxbat. The plane, a MiG-25, was flown into Japan in 1976 by a Soviet defector. It was something of a paradox. Until the hands-on inspection, the Foxbat had been considered the world's hottest warplane. In 1973, Robert C. Seamans, Secretary of the Air Force, described it as "probably the best interceptor in the world today." And indeed, when the plane was inspected in Japan the engines were found to be state-of-the-art. Rather than relying on titanium, however, the aircraft's body used steel. The electronics, moreover, were old-vacuum tubes used throughout. But the circuits themselves were far from antiquated. "Of particular interest is the aircraft's high-quality airborne computer," notes the 1981 edition of Jane's All the World's Aircraft. No U.S. official with whom this reporter spoke would address the issue of whether the use of vacuum tubes was intentional and indicative of Soviet EMP planning or whether their use was forced because of the slow dissemination of semiconductor technology into the Soviet economy.
In its most recent edition, however, the Pentagon's bible on EMP description and protection says the following (5): "Some of these methods of hardening against the EMP threat are shielding, proper circuit layout, satisfactory grounding, and various protective devices. If these measures do not appear to be adequate, it may be advisable to design equipment with vacuum tubes rather than solid-state components."
5. S. Glasstone, The Effects of Nuclear Weapons
(Departments of Defense and Energy, Washington, D.C., 1977), p. 526.
William J. Broad, Nuclear Pulse (I): Awakening to the Chaos Factor
, Science 29 May 1981: Vol. 212. no. 4498, pp. 1009 – 1012, DOI: 10.1126/science.212.4498.1009