Acceptance testing and evaluation of TOPAZ II space power systems

Thermionic System Evaluation Test: Ya-21U System Topaz International Program

“…Twenty-six (26) systems were manufactured and 19 were tested during the period from 1970 to 1989 to assure that flight systems would provide 5 to 6 kW of electrical power for space missions lasting from 1-3 years. The basic TOPAZ-I system design remained the same, although a number of design changes were made during the development period (Voss #2).…”