NSP1 strobotron

This valve measures 105x31mm overall and has a 4-pin UX base.

Ferranti call this a Neostron. It is a cold cathode tetrode arc discharge valve. The cathode is designed for pulse operation and is capable of passing currents between 5 and 250A peak. Developed primarily as a stroboscopic light source they are equally suitable for other uses where short duration pulses of very high peak current are required. The NSP2 is the same valve but with an octal base.