6E6p-e Little Tiny Wire - diyAudio
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Old 9th February 2013, 11:03 PM   #1
jlsem is offline jlsem  United States
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Default 6E6p-e Little Tiny Wire

The 6E6P-E tube has an element at pin eight that consists of a very fine wire that circles about three-quarters of the way around the internal structure of the tube. It is fastened in four places on the top and bottom micas but isn't connected to any other elements. There is a description in the second data sheet at this link but I can't read Russian.

''GSTube.com''. Tubes, sockets etc. Parameters and characteristics 6E6n-DP

Does anyone know what this does?

John
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Old 10th February 2013, 12:45 AM   #2
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"Проводящий слой внутренней поверхности баллона (Вывод 8) должен иметь отрицательный потенциал относительно катода. Обрыв цепи Вывод 8, а также приложение положительного относительно катода потенциала к проводящему слою приводят к выходу лампы из строя."

"The conductive layer (=screen) inside the tube (Pin 8) should have a slight negative potential in relation to the cathode. If Pin 8 is left open, or a positive potential in relation to the cathode is applied, it can cause a tube failure."

This means the usual way of dealing with such a screen. Simply apply ground potential. Due to the cathode resistor, the screen will be naturally a bit more positive than the cathode.
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Old 11th January 2015, 08:38 AM   #3
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Quote:
Originally Posted by the_manta View Post
.. If Pin 8 is left open, or a positive potential in relation to the cathode is applied, it can cause a tube failure.

..Simply apply ground potential. Due to the cathode resistor, the screen will be naturally a bit more positive than the cathode.
doesn't this contradict ?
i've been always wondering about the function of that wire element.
i'm using diodes in cathode bias. it looks like if it needs to be even more negative than cathode, separate supply should be used (?)
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Old 11th January 2015, 11:54 AM   #4
Charm is offline Charm  Russian Federation
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8 - Conductive layer inside surface of the cylinder. (screen)
6E6P-DR.jpg
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Old 11th January 2015, 11:56 AM   #5
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yes, but what is it for ? (if it's a tetrode and not pentode)

and how to connect it, if it has to be more negative than (already negative) cathode ?
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Old 11th January 2015, 12:27 PM   #6
Charm is offline Charm  Russian Federation
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To connect to the cathode.
http://lampilich.narod.ru/lamp_ru/pentodru/6e6p.html

Last edited by Charm; 11th January 2015 at 12:57 PM.
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Old 11th January 2015, 01:03 PM   #7
Charm is offline Charm  Russian Federation
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6E6P_pin.gif
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Old 11th January 2015, 01:08 PM   #8
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thanks. i have it connected like this for a year.

what made my questions was just to know it's function, physically-wise. and also, why it has to be more negative than cathode (which is not, if it's tied to it, or to the ground)
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Old 11th January 2015, 01:40 PM   #9
TheGimp is offline TheGimp  United States
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It looks to me like a classic drawing of the shield around the tube.

However in looking a the 6E6P that I have , it is a single gold wire which forms a vertical loop around the outside of the plate. This loop is on the ends of the plate which are partially open box structure. The ends are along the axis of the grid and screen support rods.. The loop is offset from the axis of the cathode/grid/screen and thus is asymmetrical to the rest of the tube structure..

I have no idea what this is for.
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Old 11th January 2015, 02:26 PM   #10
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6Э6П tetrode tube with a spatial suppression dynatron effect. This optional wire promotes this.
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