BULB DISCUSSION BOARDS > Antique Bulb Discussion

ID Help Please

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tommythetech:
Greetings everyone I am new here and need some help identifying this bulb please.

adam2:
Looks to me like an early type of valve/vacuum tube and not a lamp.
The screw terminals suggest use an a workshop or lab for teaching, rather than permanent use in a piece of equipment.
Only three connections suggests a directly heated diode, two connections for the filament and one for the anode.

Might be valuable since mounting as shown is rare.

Chris W. Millinship:
That looks like a General Electric NE34 neon glow lamp. Usually found with an E26 screw base that also houses an integrated resistance for use at 120 volts so it can be powered directly from standard US line voltages. Used anywhere a low power but long lived light source is desirable. Industrial indicator lights, nightlighting, that sort of thing.

In this case the bespoke mounting assembly suggests that one has been adapted for scientific or experimental uses, but for what specifically is a mystery. I can`t tell if the resistance is still present within that assembly at the bottom or not, but if it is, perhaps the three terminals allow for connection with or without it in circuit depending on application.

adam2:
Agree, that sounds more likely than my initial supposition.

emilyakbb:

--- Quote from: Chris W. Millinship on February 16, 2021, 02:31:19 pm ---That looks like a General Electric NE34 neon glow lamp. Usually found with an E26 screw base that also houses an integrated resistance for use at 120 volts so it can be powered directly from standard US line voltages. Used anywhere a low power but long lived light source is desirable. Industrial indicator lights, nightlighting, that sort of thing.

In this case the bespoke mounting assembly suggests that one has been adapted for scientific or experimental uses, but for what specifically is a mystery. I can`t tell if the resistance is still present within that assembly at the bottom or not, but if it is, perhaps the three terminals allow for connection with or without it in circuit depending on application.

--- End quote ---

I also agree with this idea.

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