ILD3-K (ILD3-K = red, ILD3-L = green, ILD3-S = blue) is a small cathode-ray tube without focusing system and beam deflection. ILD3-K indicator can adjust size of dot, depends on modulation and 1st anode voltage.

The main electrical characteristics:

Heater voltage, V: 6.3

Heater current, mA, nominal: 100

Anode voltage, V: 6000

1st Anode voltage, V: 40

Current anode, uA, nominal: 350

Modulator voltage, V: 0-35

Voltage cathode-heater: ±135