Posted on Sunday, 19th April 2009 by Jimmy Auw

I dig my tube boxes and found this old tube. Not a really expensive or most wanted tube, yeah… just an old Western Electric 393A tube. It’s a Argon and Mercury Vapor filled Thyratron tube. According to the datasheet, the addition of Argon gas on the Mercury Vapor atmosphere allows the tube to start conducting at low temperature. Ok, forget those technical literature, just watch the tube in action.

I heat up the tube for a while. According to the manual, to maintain the life span, it’s recommended to heat it up first. I give around 3-4 minutes. You can see the filament is glowing inside the metal bracket on the center of the tube.

Time for action, activate the High Voltage… Voila, the sky of blue on the top of the tube. Very beautiful!!! You still can see the red filament glowing inside the blue Mercury atmosphere.

(more…)

Tags: glowing, Mercury, tube, tube tester
Posted in Collectible Stuff | Comments (8)

Posted on Sunday, 12th April 2009 by Jimmy Auw

One factor that makes me like tube is its glow. Well, it’s hard to explain, but some tubes have a beautiful color, especially in dark room. Here is some of them.

Below is the 0A3/VR75 tube. It has red/fire color. Very bright and aggresive.

(more…)

Tags: Knight, Mercury, rectifier, tube tester, voltage regulator tube, VR tube
Posted in Collectible Stuff, Personal | Comments (7)