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Old 3rd Jul 2022, 12:42 pm   #1
Alf Fisher
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Default 6 Volt 40mA dial lamps

Hi all,

I'm struggling to find a couple of these lamps.
I can find only one seller on ebay and he asking 99!
The radio isn't even worth that much!

These lamps are used in several models particularly Pye 445U and P93U that all use the valve lineup of UCH42, UF41, UBC41, UL41 and UY41.

I can get 50mA and 60mA so has anyone got a way enable either of these to be used?

Alf
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Old 3rd Jul 2022, 1:53 pm   #2
JonSnell
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Default Re: 6 Volt 40mA dial lamps

https://uk.rs-online.com/web/c/light...926,4291930118
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Old 3rd Jul 2022, 3:32 pm   #3
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Default Re: 6 Volt 40mA dial lamps

Knowing the base fitting required would be a help.
I immediately imagine MES for a mains set.
Rob
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Old 3rd Jul 2022, 5:12 pm   #4
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Default Re: 6 Volt 40mA dial lamps

I'm thinking that 6 volt 40mA probably means they are the 'grain of wheat' wire-ended-micro-bulbs with flyleads that were used extensively as meter/dial-lamp illumination in 70s/80s radios/tuners etc.
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Old 3rd Jul 2022, 5:27 pm   #5
peter_sol
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Default Re: 6 Volt 40mA dial lamps

That Pye P93u. Is from 1955 so no grain of rice bulbs. Maybe the usual MES or equivalent.
They are listed in a Home radio catalogue of 1970.
The circuit shows resistors across them both so I should try the 50 MA ones.

Last edited by Cobaltblue; 3rd Jul 2022 at 9:27 pm. Reason: Edited per OP request
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Old 3rd Jul 2022, 6:00 pm   #6
Alf Fisher
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Default Re: 6 Volt 40mA dial lamps

Sorry guys,
I missed the vital point that they are MES as Peter_sol has deduced.
I've done so much searching I've got brain fade.

Alf
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Old 3rd Jul 2022, 8:44 pm   #7
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Default Re: 6 Volt 40mA dial lamps

6v 40mA were the old cycle dynamo lamps. You might find them on vintage cycle sites and suppliers.
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Old 3rd Jul 2022, 9:22 pm   #8
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Default Re: 6 Volt 40mA dial lamps

eBay have them, not cheap, but here is the item number: 110951791253
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Old 4th Jul 2022, 4:00 am   #9
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Default Re: 6 Volt 40mA dial lamps

These are not the most common type of lamp but can still be found at reasonable prices.
Some old catalogues list two different types of 6 volt 40ma lamp, one is a pilot lamp and one a cycle dynamo tail lamp.

Used in cold war fallout shelters to provide minimal area lighting for DAYS from one set of batteries. A 996 lantern battery will run one of these for about 200 hours, or over a week. The rather feeble light is enough for safe movement in familiar surroundings with dark adapted eyes.
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Old 4th Jul 2022, 6:32 am   #10
Alf Fisher
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Default Re: 6 Volt 40mA dial lamps

Thanks Rob,
There was a strange effect with that number. Each time I entered it, I got a different lamp bulb. The first time it was 2.2v @ 0.25A, then next time 6volt @ 0.1A but the was a drop down option for 0.04A.
Thanks for the info Rob.
I'll give that one a try and see what I get.
Cheers, Alf
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Old 4th Jul 2022, 7:19 am   #11
David G4EBT
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Default Re: 6 Volt 40mA dial lamps

Don't know if you've seen this listing:

https://www.ebay.co.uk/itm/110851079...=&toolid=10050

Qty 5: 6V 40, 60 or 100 mA M.E.S. E10 Indicator Lamp Torch Bulb 0.04A 0.06A 0.1A

4.95 + 2.95 'Buy It Now'.

(For one lot of five bulbs).

Hope that might help.
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Old 4th Jul 2022, 7:52 am   #12
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Default Re: 6 Volt 40mA dial lamps

I just wonder if these are new production but made in China? Seems 1000s have been sold.
I had some in the past but just got rid in a bargain bag of assorted bulbs.
Seeing the prices, I must pay more attention!
Rob
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Old 4th Jul 2022, 2:53 pm   #13
broadgage
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Default Re: 6 Volt 40mA dial lamps

I rather doubt that these are still manufactured in view of what I suspect is very limited demand. Almost certainly old stock being sold.

As regards the ebay sellers claim to have sold thousands, I suspect that this is the TOTAL sales from a multi choice listing that includes large sales of far more popular types.

OTOH manufacture of miniature lamps is not that hard, and a small factory in China could probably make a small batch of a hundred or a few hundred if required. The current rating is very similar to that of a 120 volt, 5 watt nightlight bulb which is a popular type. So a lamp factory would have have stocks of suitable filament wire. Cutting it to length and mounting it in a standard small bulb, fitted with a standard small base is easy and similar to making other more popular miniature lamps.
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Old 4th Jul 2022, 2:57 pm   #14
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Default Re: 6 Volt 40mA dial lamps

Quote:
Originally Posted by JonSnell View Post
At that price, from a reputable seller, I'd get these as Jon suggests and do a base/holder transplant.

eBay specials, albeit with the correct base, may or may not be up to the job in terms of longevity; the three RS ones claim 2,000 to 20,000 hour life. Cycle and torch bulbs generally are designed to be more efficient in terms of light output per watt, but at the cost of shorter life (or so someone here told me once).
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Old 4th Jul 2022, 4:18 pm   #15
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Default Re: 6 Volt 40mA dial lamps

Unless there is something unusually critical or demanding about the application basic ebay bulbs should be fine.

The smaller bulbs, about 11mm diameter were generally pilot lamps and the larger bulbs, about 15mm were generally cycle tail lamps.
The cycle lamps gave a very feeble light, and no light at all when stopped.

Torch bulbs had a typical life from a few hours to a few dozen hours.
Cycle lamps a few dozen hours, but very variable.
Motor vehicle headlamps often about a hundred hours, or a thousand hours for side lights. Dashboard indicators sometimes outlasted the vehicle.

Pilot lamps varied from a minimum of a thousand hours, up to many times that.
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