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Old 16th Jan 2018, 5:55 pm   #1
Brettski
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Default Roberts RM33

Hi all, could any one advise what the correct value display bulb is fitted to the Roberts RM33 please. Some one has swapped mine out and its really dim.

If anyone would like to sell me one that would be great too.

(Graham, thought I would try the nice people on here too)

Many thanks. Brett.
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Old 16th Jan 2018, 6:16 pm   #2
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Default Re: roberts RM33

https://www.vintage-radio.com/manufa...s/roberts.html ...

"The dial lamp bulb should, according to the service information, be a 6.5V 0.3A type. However, this is run at full voltage and does not enjoy a long life. After replacing two such bulbs in my set within a year, I fitted a 12V 2.2W type instead. This gives ample illumination for the scale, and has so far lasted over five years."
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Old 16th Jan 2018, 6:29 pm   #3
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Default Re: roberts RM33

I could not find a specification for the bulb in the Roberts service info, only a 6 volt tap on the transformer.
From the info in the link that Paul posted I would try that suggestion.
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Old 16th Jan 2018, 9:50 pm   #4
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Default Re: roberts RM33

Thanks guys, I’ve got inside now and I am getting 5.8v across the bulb. The bulb fitted is a 12v but says 0.1 amp rather than watt.

I’m thinking I might try and get one 6v and one of the 12v 2.2w and see where that take me .

Many thanks
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Old 16th Jan 2018, 10:09 pm   #5
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Default Re: Roberts RM33

I have now ordered a 6.5v and a 12v . I have also found a 9v too. I figure if 6.5 burns out quick and 12v ( which is what’s fitted now) is still to dim( no sure how good my bulb is, i presume they either work or they don’t) then the 9v should be a good compromise.

Thanks for your help
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Old 16th Jan 2018, 11:28 pm   #6
Herald1360
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Default Re: roberts RM33

Quote:
Originally Posted by Brettski View Post
The bulb fitted is a 12v but says 0.1 amp rather than watt.
That's 1.2W. A 12V 2.2W one will give a bit more light at 6V than that one will.
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Old 17th Jan 2018, 1:26 pm   #7
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Default Re: Roberts RM33

Thanks Chris, I will fit all three and see which I like best . The 12v I have ordered is 2.2w

Cheers

Last edited by Brettski; 17th Jan 2018 at 1:28 pm. Reason: took smiley face off post as it was wrong emotion
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Old 18th Jan 2018, 9:31 pm   #8
Brettski
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Default Re: Roberts RM33

Hi all, my 9v bulbs came today and they are perfect.

So if the info is any use to anyone the RM33 and probably the other Roberts table radios will take a MES E10 300ma 9v bulb .

Thanks for everyone’s help .

Brett
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Old 19th Jan 2018, 8:29 am   #9
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Default Re: Roberts RM33

Quote:
Originally Posted by Brettski View Post
(Graham, thought I would try the nice people on here too)
Well done Brett. I knew the forum members would have the answer. I haven’t had to change any bulbs in mine yet but I will pick some up just in case.

Regards

Graham
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