Further info in support of the above comment:

- The Mig had been manufactured in February 1976 and thus was one of their latest most sophisticated production aircraft.

- Transistor circuitry was not used but instead the Soviets relied on vacuum tubes for most of their electronics.

- The Soviets reasoned the vacuum tubes were less affected by EMP waves in the case of nuclear attack; were more resistant to temperature extremes and they were easy to replace in remote airfields where transistors may not be readily available if repairs were needed.

- Welding was done by hand.

- Rivet heads were exposed in areas not critical to parasitic aerodynamic drag.

- Pilot forward vision was highly obstructed.

- With huge Tumansky R-15D-300 engines the Mig was considered almost a rocket.

- Pilots were forbidden to exceed Mach 2.5. There was a total of three engine instruments and the airspeed indicator was redlined at 2.8 Mach.

- Above Mach 2.8 the engines would overheat and burn up. The Americans had clocked a Mig-25 over Israel at Mach 3.2 in 1973. Upon landing in Egypt, the engines were totally destroyed. We did not understand that the engine destruction was inevitable.

- The combat radius is 186 miles.

- Without using afterburner; staying at optimum altitude and not maneuvering, the Mig can fly in a straight line for 744 miles.

- The plane was so heavy at 64,200 pounds, that according to early rumors Soviet designers had to eliminate a pilot ejection system. However this was disproved.

- Most MiG-25s used the KM-1 ejector seat. The last versions used an early variant of the famous K-36 seat. The speed record for the fastest successful ejection (Mach 2.67) is held by a KM-1 equipped MiG-25.

- Maximum operational altitude: Carrying two missiles, 78,740 feet (for maximum two minutes duration); carrying four missiles, 68,900 feet is maximum.

- Maximum altitude of missiles: 88,588 feet.

- Ability to intercept an SR-71: Belenko states the Mig-25 cannot intercept the SR-71 for several reasons: The SR-71 fly too high and too fast; the Mig cannot reach it or catch it. The missiles lack the velocity to overtake the SR-71 and in the event of a head on missile fire (The Golden BB), the Guidance system cannot adjust to the high closure rate of the SR-71.

- The Mig-25 has a jam proof radar but cannot distinguish targets below 1,640 feet due to ground clutter. The radar was so powerful it could burn through jamming signals by approaching bombers.

- Maximum G load: With full fuel tanks 2.2 G's is max; with near empty fuel tanks, 5 G's is dangerous. The Mig-25 cannot turn inside a U.S. F-4 Phantom fighter!

- The plane was made of steel alloy, not high temperature titanium, although strips of titanium was used in areas of high heat concentration.

- In a tight turn the missiles could be ripped from the wings.

- The Mig-25 was was not a fighter or an air superiority aircraft but rather designed by the Soviets to climb at tremendous speeds, fire missiles at one pass of the target and then land.

- Search and tracking radar had a range of 55.9 miles.

- The pilot duties were to take off, turn on the auto pilot and await instructions to fire the missiles from ground controllers. The Mig-25 had a superb auto pilot and digital communications from an onboard computer to ground controllers.

- Credit is given to the Soviets for building a high altitude Interceptor in a short period of time with the materials and engines available to them in 1967 in order to counter the perceived threat of the XB-70.

Source: http://www.wvi.com/~sr71webmaster/mig25.html