Question about this Marconi.
Question about this Marconi.
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L610
Brans tube compendium calls A 615 as corresponding.
The black spot at your tube is hiding the MWTC (Marconi Wireless Telegraph Co) logo.
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- 400_3963616465386432 (29 KB)
- 400_6535333438613232 (31 KB)
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Marconi?
Thank you for helping me. I not see in your picture the socket, is it the same with the Marconi's. On my reversed picture it can be seen a 4 figure. But I am not positive...
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yes I left out a photo showing the socket because it´s exactly the same one.
I did not yet find any more information on this triode.
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L610
Francisc,
It could well be a L610, but please compare with the specimen in the National Valve Museum, HERE. The size, base and structure should help.
If the vacuum and filament are intact you may care to check that it is indeed a 6V tube.
Regards,
Roy
P.S. Reiner, please load a picture as there is not one for the L610 - thank you.
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Here we are
Yes, I am happy to load the pictutre but want to assure myself, the listed TUNGSRAM L610 tube is identical to the MARCONI type.
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L610
As usual your comments are very well done, thaks for making clear the doubts around this nice tube from the early of radio communication.
Best regards,
Francisc
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L610
Reiner, Francisc
Thank you! I am not convinced about the Tungsram L610 and can find no reference to it. The cited Taschenbuch zum Röhren-Codex 1948/49 may be in error.
However, I shall leave it in existence and ask for it to be verified. If the Tungsram and Marconi have identical characteristics we can amalgamate.
In the meantime, for security, I have added the L610_Marconi for your pictures.
Regards,
Roy
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L610???
I just wanted to upload the picture when I took a look again to my Marconi and I have seen some yellow marks. After a soft cleaning the following inscription came up:
....ED & PATENTED IN ENGLAND
The first letters should be 'manufactur' I guess, then under the '&' sign there is '51' and under the letter 'N' (from England) there is a '1'. It is written roundly.
End now the surprise, at lest for me, the type is
DET 9
I tested several times using a magnifier (x6) and breathing many time on the glass!
Also in my oldest Radio Valve Data (1958, MK Budapest) there are six type of L610 only one has a 'D' at the end but what is strange is that there is one with 4 v heater voltage the rest with 6 v. The manufacturers are:
Geco (L610)
Lissen (L610, 4v heater)
Tungsram (L610)
Valvo (L610)
Osram (L610, L610D)
On the RM there is an empty page for DET 9....
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DET9
Thank you for the dilligence Francisc!
I have added data to the DET9 which also met the CV specification CV2899. This type was available from the manufacturers as late as 1963 although from existing stocks and of a later pattern.
The most common circular writing said "MADE & PATENTED IN ENGLAND". The 51 is a batch coding.
As before mentioned, I find that putting the tube in the refridgerator for a period before trying to read weak markings as the slight moisture lasts longer and enables focussing and even photography.
Now that we are certain of your tube, please load the pictures.
Regards,
Roy
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DET9
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DET9
P.S.
Roy, thanks for the idea with the refrigerator.
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It seems that your three pictures of the DET9 tube are correctly placed on the DET9 page ready to be shown. What is the problem, please?
Roy
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