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Old 26th Oct 2023, 10:00 pm   #1
kirstyd
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Default Any electric iron experts out there?

I have a Morphy richards steam iron given to me by my aunt in1977 although i think it may be older than that .Its still in regular use .last week i was replacing the flex for [at least]the fourth time and i managed to smash the small light bulb. Its one of those miniature things smaller than a torch bulb .Can anyone tell me what its rating would be and where i might get a replacement or something that would do the job
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Old 26th Oct 2023, 11:37 pm   #2
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Default Re: any electric iron experts out there

It's an LES size bulb, can you see any engraving around the side just below where the glass was?
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Old 27th Oct 2023, 12:45 am   #3
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Default Re: Any electric iron experts out there?

It seems to show 12V 0.1A in the picture.
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Old 27th Oct 2023, 8:21 am   #4
Leon Crampin
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Default Re: Any electric iron experts out there?

My recollection is that these irons used an MES cap lamp rated at 1.2 V. Careful measurement should verify this - the lamp supply being derived from a shunt in series with the element.

1.2 V lamps were common in single cell applications such as cycle rear lamps of old.

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Old 27th Oct 2023, 1:27 pm   #5
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Default Re: Any electric iron experts out there?

1.2v at 0.1A is going to be a bit dim in a lighted room (the best sort to do ironing in).

12v LES bulbs were once very common and easily available. Look for a classic car parts supplier and they may not have heard of Lilliput Edison Screw, but they'll know it as the bulb for the indicator stalk of an early mini. (No car discussion, please. Citing a source was helpful to the original poster)

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Old 27th Oct 2023, 2:37 pm   #6
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Default Re: Any electric iron experts out there?

A Google search for 12v LES lamp brings plenty of hits - as long as you make sure it doesn't look for LED lamps!
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Old 27th Oct 2023, 2:39 pm   #7
Leon Crampin
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Default Re: Any electric iron experts out there?

Consider the dissipation in the shunt. At nearly 5A element current, a 12V lamp would need a shunt dissipating nearly 60W. Although this energy could be dissipated in the sole plate, the MR irons of that vintage I have seen just use a small coil of resistance wire in free air.

The lamp is just an indicator - it doesn't illuminate anything and on the irons I've seen it's a bare lamp in the handle, sometimes painted green. An LED with appropriate circuit mods could be used. All of the MR irons I have seen used a lamp with an MES cap.

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Old 27th Oct 2023, 2:47 pm   #8
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Default Re: Any electric iron experts out there?

A tap in the element? The one I remember in the sixties was quite bright.

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Old 27th Oct 2023, 4:38 pm   #9
ex 2 Base
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Default Re: Any electric iron experts out there?

On the brass rim I can see 12 volt, and if you are unable to get fixed up in Leeds, then a trip to sunny Scarborough as I'm sure I have a lot. Ted
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Old 27th Oct 2023, 5:11 pm   #10
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Default Re: Any electric iron experts out there?

I read it that the smashed mangled thing in picture 3 was the actual bulb, I took it that picture 4 was to demonstrate the size?

I think some clarification is needed from the OP

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Old 27th Oct 2023, 5:18 pm   #11
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Default Re: Any electric iron experts out there?

It is possible to confuse 12V and 1.2V markings as the decimal point isn't always prominent. A little while ago I ordered some 12V MES bulbs from CPC, and although the sealed bags said they were 12V, the bulbs themselves turned out to be 1.2V, a type that CPC didn't sell. The filaments looked wrong, far too small for a 12V bulb, so I didn't destructively test them.

Measuring the voltage across the lamp socket will tell you which voltage bulb you need.
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Old 27th Oct 2023, 6:27 pm   #12
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Default Re: Any electric iron experts out there?

So far as I know, no lamp shunt resistance was used, the lamp was connected between one end of the element and a tapping at little way from the end.
Presuming about 10 volts on a 12 volt lamp so as to give a long lamp life, the tapping would be about 4% from the end.
A 3.5 volt MES lamp was more popular in older types of iron, that required a tap about 1% from the end, to give about 2.4 volts on the lamp.

therefore any common type of 12 volt LES bulb should be suited, even an LED lamp should do if suited for AC.
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Old 27th Oct 2023, 9:52 pm   #13
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Default Re: Any electric iron experts out there?

the bulb i am holding in the picture is for size reference .the broken brass base is what's left of the actual bulb . there is a shunt [in the form of a simple spring]inside the main body of the iron .One side of the bulb holder is connected to the live connection and the other to earth and when the bulb is in situ it sits inside a green holder and is quite bright when illuminated coming on and off as the thermostat cycles
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Old 27th Oct 2023, 9:57 pm   #14
kirstyd
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Default Re: Any electric iron experts out there?

thanks guys for your interest and advice
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Old 27th Oct 2023, 11:42 pm   #15
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Default Re: Any electric iron experts out there?

If the good bulb in the photo is a MES one, the smaller diameter broken bulb base looks like a LES one (Lilliput Edison Screw).
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Old 28th Oct 2023, 4:34 pm   #16
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Default Re: Any electric iron experts out there?

That iron looks familiar, i believe we had the same one, in black.

I would be tempted to use a neon and resistor provided it can be done without compromising safety/isolation. You can get neons with special phosphors, including green. I'm just wondering if the resistor could cope with the heat though.

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Old 28th Oct 2023, 7:47 pm   #17
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Default Re: Any electric iron experts out there?

Hi, I'm afraid a neon will not operate correctly in this position. It is not used as an "iron on" indicator, but it went out when the stat opened to shoe the iron was up to temp, then cycles as the stat opened and closed.
It detected the current flowing/ volt drop across the small nichrome resistor in series with the element
As has been said before, it was typically 1.5 to 2.5 V and a battery torch type. All the ones I have seen were MES types, not LES

If anyone is in need I may have some of the Morphy Richards black plastic bulbholder assemblies that used to form the rear of the Handle

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Old 28th Oct 2023, 8:12 pm   #18
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Default Re: Any electric iron experts out there?

Another member had one of these irons.

https://www.vintage-radio.net/forum/...d.php?t=126623

Perhaps worth a PM?

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Old 28th Oct 2023, 8:35 pm   #19
The Philpott
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Default Re: Any electric iron experts out there?

Clever design, thanks for confirming.

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Old 28th Oct 2023, 10:28 pm   #20
David G4EBT
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Default Re: Any electric iron experts out there?

Quote:
Originally Posted by kirstyd View Post
the bulb i am holding in the picture is for size reference .the broken brass base is what's left of the actual bulb . there is a shunt [in the form of a simple spring]inside the main body of the iron .One side of the bulb holder is connected to the live connection and the other to earth and when the bulb is in situ it sits inside a green holder and is quite bright when illuminated coming on and off as the thermostat cycles
As mentioned, that bulb is an 'L.E.S' - 'Lilliput Edison Screw'.

I'm not saying whether the ones at the link below are the correct voltage or current rating, but if you can ascertain that, the firm may well be able to suitable suitable ones:

https://www.lamps2udirect.com/miniat...t-bulbs/144997

If you do a google search, don't seek 'LES' bulbs - enter the name in full or google will think you've made an error and that what you are really looking for is 'LED' bulbs.

Hope that might help a bit.
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