Intro: Vaccum Tube Night Light
Ok, this is a instructable on how to turn old vaccum tubes into a cool looking light source.
Even though title says night light I would be kind of afraid of use them as that because they get really hot and could short out and what not. Also be very careful when working with mains voltages its not deadly but will deliever a very bad shock, and never place vaccum tubes close to anything flamable.
Step 1: Get Some Old Tubes!!!!!!!!!
The first thing you need do is find some old tubes. I would say you can use just about any type of tube I used two old 36am3 rectifier tubes out of an old radio.
Step 2: Finding the Heater Pins
Fort his instructable we only want the vaccum tubes to light up and look pretty, so we need to find the two heater pins. The way to did this, is get an ohm meter and tested all the pins. The two heater pins should be the two with the highest resistance, on mine it was about 100 ohms.
Step 3: Powering the Tubes?!?!
Most vaccum tubes run on fairly low voltages, so I hooked mine up to a variac,MAKE SURE AND DONT PLUG DIRECTLY INTO WALL AT FIRST. Slowly adjust the voltages to you start to see tubes light up. Mine did around 40-50 volts, but the tubes i used were quite small so if u decide to use power tubes or something like that it would probably take much more voltage. I did accidentally blew out one tube at about 80 volts, so when it gets a good glow going dont turn it up to much more.
Step 4: Enclosure
Your probably going to want to put the tubes in something preferbely heat proof. I put mine in a old glass jar and used part of an old trumpet to add to the look (see pic).