Similar to ジャイロトロン

Klystron

Cavity magnetron

12AT7

12AU7

12AX7

6GH8

6N3P

6SN7

Output transformerless

Phototube

Nanoscale vacuum-channel transistor

Traveling-wave tube

Magic eye tube

13th century BC

1st Marine Infantry Parachute Regiment

I Corps (South Korea)

Gunn diode

Microwave engineering

Maser

Vacuum tube

6AK5

6DJ8

6N1P

EL34