GOST 11948-1978 Devices for measurement of wow, flatter, parasitic amplitude modulation and drift factors for sound recording and reproduction apparatus. Technical requirements and test methods
GOST 15150-1969 Machines, instruments and other industrial products. Modifications for different climatic regions. Categories, operating, storage and transportation conditions as to environment climatic aspects influence
GOST 24863-1987 history
1987GOST 24863-1987 Magnetic tape recorders for domestic use. General specifications