Customization Update - Rocket Jumper 2D Playtest

2d 21 The 2D21 thyratron is, as usual, a gas filled valve, in this case the gas at low pressure is xenon. This example is of tetrode construction and was desned. 2D21. THYRATRON. OPERATIONAL RANGE. OF CRITICAL GRID VOLTAGE. TYPE 2D21 SHIELD

2d 69, The Sylvania Type 2D21 is a miniature four element thyratron with negative control character.