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 Post subject: Old bulb
PostPosted: Mar Fri 09, 2018 9:49 pm 
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Found 3 of these incandescent small bulbs in a box of old radio parts. They are 2 inches long...any idea when and how these might have been used?

Frank


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 Post subject: Re: Old bulb
PostPosted: Mar Fri 09, 2018 10:06 pm 
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Frank,

It looks like it is a panel lamp of some sort. The bulb number, and voltage should be on the base. I have a MEP-002A generator that uses bulbs, that look like this and measure slightly under 2 inches in length, to illuminate the operator panel at night.

Pat


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 Post subject: Re: Old bulb
PostPosted: Mar Fri 09, 2018 11:00 pm 
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The base only has a very small
......usa......with dots on either side.
Frank


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 Post subject: Re: Old bulb
PostPosted: Mar Fri 09, 2018 11:12 pm 
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HP also used similar bulbs in a couple of their signal generators, for current limiting in the oscillators I believe.

I'm stuck inside with a cold or I'd dig you up more details.

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 Post subject: Re: Old bulb
PostPosted: Mar Fri 09, 2018 11:15 pm 
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They were used in many applications such as industrial panel indicators.

Here is one marked GE 6W
Ive got a bunch in a bag.

-Steve


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 Post subject: Re: Old bulb
PostPosted: Mar Fri 09, 2018 11:19 pm 
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That looks identical...what date would those have been?
Frank


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 Post subject: Re: Old bulb
PostPosted: Mar Fri 09, 2018 11:24 pm 
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Judging from the stuff we have at work, I would guess the 1950s through the 80s.
Not really sure.

-Steve

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 Post subject: Re: Old bulb
PostPosted: Mar Sat 10, 2018 7:08 am 
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If there is no marking on the base, look at the top of the glass. The most common sizes are 6W and 3W. The 6W ones were commonly used in pilot lights, night lights, exit signs, etc. The 3W ones were also used in many audio signal generators to stabilize the output voltage. They are made in a variety of voltages, and there were even colored ones. I have a couple of 10W 240V ones. I didn't check but I wouldn't be surprised if they aren't still being made for replacement use. They were mainly used until similar LED lights came along.

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 Post subject: Re: Old bulb
PostPosted: Mar Sat 10, 2018 9:09 am 
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I think of sewing machines, and I have one test equipment panel that uses them. It is the only shape that will fit.


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 Post subject: Re: Old bulb
PostPosted: Mar Sat 10, 2018 9:29 pm 
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you can still get those bulbs, I've seen them in our local hardware stores.

https://www.cesco.com/GE-Lighting-6S6-3 ... r/p2125673

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 Post subject: Re: Old bulb
PostPosted: Mar Sat 10, 2018 11:24 pm 
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It's called an "indicator bulb," because they were used in numerous places where a 115-V or 230-V indicator was needed--elevator floor indicators being a major application at one time. From the long filament on yours it may be a 230-volt one (they were often used on 115 volt circuits to give longer life). Earliest ones with that bulb style I have ever seen dated to the 1930s; they are still in production today. It's a standard miniature candelabra base.

Will say that they are not the longest life bulbs out there and they tend to be delicate if shaken or shocked. Best used for things that are only on intermittently. For things that will be on constantly, neon or LED indicators are preferable.

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 Post subject: Re: Old bulb
PostPosted: Mar Sun 11, 2018 12:02 am 
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Chris108 wrote:
Best used for things that are only on intermittently.

Curiously, they were also used in the permanently on red indicator lights located above fire alarm pull stations. But if they're on continuously they don't suffer from thermal shock, so they should have a long life.


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 Post subject: Re: Old bulb
PostPosted: Mar Sun 11, 2018 3:49 am 
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Type 6S6; besides indicators and pilot lamps, they were used for many years as a framing light in 35mm theatre projectors. The bulb would shine through the aperture plate, allowing the projectionist to properly thread the film "in frame".

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 Post subject: Re: Old bulb
PostPosted: Mar Sun 11, 2018 4:22 am 
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They make 135V and 145V versions for longer life in exit signs.

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 Post subject: Re: Old bulb
PostPosted: Mar Sun 11, 2018 3:49 pm 
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They were in some wall switches to indicate visually if switch was on, ones I remember had a stainless cap with serrations over the bulb... Used for attic, garage etc that may not be obvious from switch location were on...

I have a few here, maybe even a 220v... I know I had one, but probably 10 years ago sent it to a fellow ARF member...

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 Post subject: Re: Old bulb
PostPosted: Mar Sun 11, 2018 9:36 pm 
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I have a Westinghouse radio Model H204-A that uses a 6S6 bulb like that. It looks really odd-ball in there.


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 Post subject: Re: Old bulb
PostPosted: Mar Tue 13, 2018 8:13 pm 
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35Z5: I have exactly what you describe. A part of our house that was finished in the late 50s or early 60s has one of these, the bulb sockets fit a Despard type electrical plate, that allows mixing and matching of switches and outlets. In our case, there are two bulbs that are wired to light when either of two in-wall electric heaters are on. The bulbs are located at the top of the stairs, so this must have been intended as a way to know if a heater was left on without going up to check the thermostat. I'm glad to read the information here, because I have one bulb that is burned out, and had no idea of what type I was looking for until today. BTW, if anyone has one to sell and wants to send me a PM..... I am also willing to upload a photo of the light assembly if anyone is interested.


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 Post subject: Re: Old bulb
PostPosted: Mar Wed 14, 2018 3:25 pm 
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classicelectronicsguy wrote:
35Z5: I have exactly what you describe. A part of our house that was finished in the late 50s or early 60s has one of these, the bulb sockets fit a Despard type electrical plate, that allows mixing and matching of switches and outlets. In our case, there are two bulbs that are wired to light when either of two in-wall electric heaters are on. The bulbs are located at the top of the stairs, so this must have been intended as a way to know if a heater was left on without going up to check the thermostat. I'm glad to read the information here, because I have one bulb that is burned out, and had no idea of what type I was looking for until today. BTW, if anyone has one to sell and wants to send me a PM..... I am also willing to upload a photo of the light assembly if anyone is interested.

Shoot me a PM with addy...

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