Marconi valve…

ID: 232168
? Marconi valve… 
07.Oct.10 21:42
19

Francisc VISKY (RO)
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Francisc VISKY

 

In interesting valve… who knows the type?

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 2
May be a Q type 
08.Oct.10 06:27
19 from 7072

Emilio Ciardiello (I)
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Emilio Ciardiello

Dear Francisc,

give a look here. Your tube looks very similar to this one.

Regards, Emilio

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 3
? Q 
08.Oct.10 07:55
34 from 7072

Francisc VISKY (RO)
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Francisc VISKY

 

Yes! It is.  Thank Emilio! Reading the dataset it seems that it is a triode… Isn’t it?

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 4
? V24 and similar tubes 
08.Oct.10 08:40
53 from 7072

Emilio Ciardiello (I)
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Emilio Ciardiello

Of course not sure of the exact type. Tyne describes this family of Marconi tubes, characterized by low parasitic capacitance. The first type in 1916 was the V24 triode, intended as high frequency amplifier (about 1MHz). The Q type was used as detector. It is similar to V24, differing for the grid construction, a fine mesh gauze supported by two glass stems. Unfortunately internal details are not visible in the picture. Tyne also describes some tetrode types, the FE1 and the FE2, but they have an additional side cap for G2.

Hope that you can positively identify your tube, maybe helped by other members with more experience on this odd family.

Regards, Emilio

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 5
? Q, QX, or V24 
08.Oct.10 17:38
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Roy Johnson (GB)
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Agreed!   From the labelling it is most likely one of these three, which were in production until the mid 1930s for some Naval equipments.

Can see inside (or X-ray it), a positive identification may then be possible.

Best regards,

Roy

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 6
V-24 
08.Oct.10 21:29
127 from 7072

Francisc VISKY (RO)
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Francisc VISKY

 

Thank you, both of you… It is V24… 90%... according with the size of the anode plate. It can be seen here too.

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 7
QX or V-24 
08.Oct.10 21:58
133 from 7072

Roy Johnson (GB)
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Hello Francisc,

The anode size and construction of the QX is very similar to the V-24.

For comparison see below from Vyse and Jessop - A history of Valve-Making.

The performance of the tubes designed by Captain Round were a great achievement. The reduced inter-electrode capacitance enabled excellent high frequency performance. They were difficult and expensive to manufacture as they were hand built by experienced glass-blowers.    

Best regards, Roy

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