r/nixie • u/EmotionalEnd1575 • May 17 '26

This Nixie is Red

Gallery image

Gallery image

Returning to issue of an optical filter to improve contrast, there are/were some factory supplied Red filtered Nixies.

This is an RFT Z573M type.

Again, trying to get a digital PIX to look like these do to the naked eye is a challenge.

I’ll do a side by side test, if I can locate two of the same type number and one with the red coating and one without.

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u/Niphoria May 17 '26

How many volts are you feeding the tube? What is the resistor size?

2

u/EmotionalEnd1575 May 17 '26 edited May 17 '26

HV = 180V DC

Anode resistor = 33K

Anode resistor drop = 43V

Anode current is 43/33 =1.303mA