n ,
he 1950s/1960s as an indicator lamp (on/off) at about the time that radio m anufacturers started to become concerned about user-servicing and hot-chass is radios - something that never really bothered them in the past. The work ed on the theory that a neon lamp was far less likely to burn out than the old standby #44 or #47, so that loose fingers were less likely to get nippe d. ASIDE: Audio devices held on to incandescent lamps (With specific refere nce to the 47) well into the 80s, before shifting - very slowly - to LEDs o r Fluorescent lamps. But, they had transformers on board to isolate the cha ssis.
only one post will light. It will trip (glow) at about 90V +/-.
220 or 240 V - that is voltages outside of Japan and the Americas. As sup plied, it has a 100K resistor in series with the lamp. For conversion to 22 0V, I have heard values of up to an *additional* 220K in series. Try there and work back if you wish to operate at 220V.familiar with, and keep a bunch of these lamps in my spares-box.
Yes antique radios. I like them to with filaments glowing in the tubes.For younger members the tube is old glass bulb valve with the led on top. Some of them have the magic green eye for RF strength if you are lucky enough to find one. Neat trick that you can do with the old variable capacity plate tuner. Charge it to 30 volts with a neon bulb across. When you turn the tun ing knob to open the plates the neon bulb will flash? With only 30 volts ho w could it flash a neon bulb with a 80 volt trigger voltage?