Startup of a Russian “type 458“ gyro block of a MiG-21 fighter after almost 40years of storage

The ’type 458’ gyro block (In Russian: 458МКС-15-32) in combination with the AGD-1 1122A/B (In Russian: АГД-1) type attitude indicator/artificial horizon is a part of the inertial navigation system used in the Mikoyan-Gurevich MiG-21 supersonic jet fighter aircraft. The same gyro block is also used on a big variety of other Russian fighter jet or transport aircraft still flying today! The shown gyro block was kept in storage for almost 40years after being rejected, this is the third startup after the storage. The cover is removed, so you can see the internals of the system during startup and very basic testing. The current setup yet lacks the matching AGD-1 1122A/B type HSI instrument, which could show both pitch and roll, so instead the pitch indicator block (syncro resolver and AC servomotor with servo amp) of a AGB-3K type attitude indicator is wired up for operation. Power requirement of the system is 27V DC and 3x36V 400Hz AC. Steady state total power consumption of the system is aro