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sci / sci.electronics.repair / Re: Unusual lamp bulb.

SubjectAuthor
* Unusual lamp bulb.peter
+- Re: Unusual lamp bulb.Eli the Bearded
+- Re: Unusual lamp bulb.John Robertson
`- Re: Unusual lamp bulb.Carlos E.R.

1
Subject: Unusual lamp bulb.
From: peter@easthope.ca
Newsgroups: sci.electronics.repair
Organization: A noiseless patient Spider
Date: Tue, 6 Aug 2024 23:12 UTC
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: peter@easthope.ca
Newsgroups: sci.electronics.repair
Subject: Unusual lamp bulb.
Date: 06 Aug 2024 16:12:14 -0700
Organization: A noiseless patient Spider
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Hi,

Photo of the bulb and box here. http://easthope.ca/Bulb25T6.5.jpg

145 V, 25 W.

The filament in this bulb is broken but I've inherited more then 100
of them.

Anyone recognize this? What is or was a typical use?

Thx, ... P.

Subject: Re: Unusual lamp bulb.
From: Eli the Bearded
Newsgroups: sci.electronics.repair
Organization: Some absurd concept
Date: Wed, 7 Aug 2024 01:38 UTC
References: 1
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From: *@eli.users.panix.com (Eli the Bearded)
Newsgroups: sci.electronics.repair
Subject: Re: Unusual lamp bulb.
Date: Wed, 7 Aug 2024 01:38:36 -0000 (UTC)
Organization: Some absurd concept
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In sci.electronics.repair, <peter@easthope.ca> wrote:
> Photo of the bulb and box here. http://easthope.ca/Bulb25T6.5.jpg
> 145 V, 25 W.

E17 (standard "intermediate" base), T6.5 bulb shape. Nothing very
unusual there.

> The filament in this bulb is broken but I've inherited more then 100
> of them.

Those are used in horizontal desk work lights, picture frame lamps,
things like that. I believe the 145 volt rating is so typical use will
be undervoltage giving a longer life.

Fixtures like this:

https://www.etsy.com/listing/1267012161/vintage-pair-of-wall-art-display-frame

Some appliances may take a bulb like that, too. Sewing machines
typically have a smaller long tube bulb, but maybe one takes that size.

Elijah
------
maybe music stand lights, too

Subject: Re: Unusual lamp bulb.
From: John Robertson
Newsgroups: sci.electronics.repair
Organization: A noiseless patient Spider
Date: Fri, 9 Aug 2024 14:56 UTC
References: 1
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From: jrr@flippers.com (John Robertson)
Newsgroups: sci.electronics.repair
Subject: Re: Unusual lamp bulb.
Date: Fri, 9 Aug 2024 07:56:22 -0700
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On 2024-08-06 4:12 p.m., peter@easthope.ca wrote:
> Hi,
>
> Photo of the bulb and box here. http://easthope.ca/Bulb25T6.5.jpg
>
> 145 V, 25 W.
>
> The filament in this bulb is broken but I've inherited more then 100
> of them.
>
> Anyone recognize this? What is or was a typical use?
>
> Thx, ... P.
>
>
>

Used for fish tanks and bookcases...

John :-#)#

--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
#7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

Subject: Re: Unusual lamp bulb.
From: Carlos E.R.
Newsgroups: sci.electronics.repair
Date: Fri, 9 Aug 2024 20:08 UTC
References: 1
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From: robin_listas@es.invalid (Carlos E.R.)
Newsgroups: sci.electronics.repair
Subject: Re: Unusual lamp bulb.
Date: Fri, 9 Aug 2024 22:08:19 +0200
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On 2024-08-07 01:12, peter@easthope.ca wrote:
> Hi,
>
> Photo of the bulb and box here. http://easthope.ca/Bulb25T6.5.jpg
>
> 145 V, 25 W.

I googled. I found one reference to a DC max of 145.

https://www.vintage-radio.net/forum/showthread.php?t=98436

«I have seen 140/145 volt DC supplies, but in that case the 140/145
volts was the MAXIMUM not the nominal voltage.
Normally a 116 or 120 volt nominal lead acid battery charged by an
engine driven dynamo. Lighting circuits would be supplied by a voltage
regulator so as to give a roughly constant 115 volts on the lamps.
Power circuits direct from the battery and therefore up to about 140/145
volts when the engine was running.»

And this other:

«I can't throw any light on when or where 140VAC supplies were used, but
100 years ago, as GEC used to supply lamps for this sort of voltage.

In the GEC catalogue for 1911-12, while the most common voltage ranges
for which lamps were supplied were 100-130V and 200 - 260V, certain
types were available at pretty well any voltage. The customer was asked
to specify the required voltage when ordering, hence the voltage ranges
mentioned were ranges that were available and did not represent the
range of voltages over which a particular type of lamp could be used. A
range of 150-155V is specified for one particular type of lamp,
suggesting that there was a demand for lamps of this particular type for
use with a nominal 150V supply.»

--
Cheers, Carlos.

1

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