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Author Topic: what is the use for 2 cathodes in an triode?  (Read 832 times)

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Offline ELS122Topic starter

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what is the use for 2 cathodes in an triode?
« on: February 02, 2020, 12:50:40 am »
what would someone use 2 cathodes for?
I found this 6Г7 tube that has 2 cathodes and don't see it useful.
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Offline schmitt trigger

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Re: what is the use for 2 cathodes in an triode?
« Reply #1 on: February 02, 2020, 12:52:35 am »
It would be very interesting if you post the tube schematic.

Perhaps as a mixer?
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Offline ELS122Topic starter

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Re: what is the use for 2 cathodes in an triode?
« Reply #2 on: February 02, 2020, 12:53:44 am »
datasheet : https://www.gstube.com/data/430/
shematic where I found it : https://www.gstube.com/schemes/pics/Ra/Belarus.GIF
also I don't really want to know how is it used in the shematic but what can it be used for
« Last Edit: February 02, 2020, 12:58:05 am by ELS122 »
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Offline ArthurDent

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Re: what is the use for 2 cathodes in an triode?
« Reply #3 on: February 02, 2020, 01:18:19 am »
That is a multipurpose tube with one cathode, 2 anodes, plus a triode. Tubes like this were used the diodes for the detector and automatic volume control (AVC) and the triode for the 1st audio amp in a receiver. Here is a similar tube.  https://frank.pocnet.net/sheets/093/6/6SQ7.pdf
« Last Edit: February 02, 2020, 01:23:50 am by ArthurDent »
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Offline ELS122Topic starter

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Re: what is the use for 2 cathodes in an triode?
« Reply #4 on: February 02, 2020, 01:24:17 am »
wait so it's basically a diode connected to the grid of the triode?
I don't understand this at all.
https://www.radiomuseum.org/images/tubeenvdiag_klein/cv5876qgnr68_appa~~3.png
also it says in that shematic that 1 of the cathodes go to the signal diode and plate to the output
how is it?.. what??? :-//
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Offline ArthurDent

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Re: what is the use for 2 cathodes in an triode?
« Reply #5 on: February 02, 2020, 01:39:04 am »
You are not understanding what I have said or the datasheets have described. Here is the tube redrawn to make it obvious.
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Offline ELS122Topic starter

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Re: what is the use for 2 cathodes in an triode?
« Reply #6 on: February 02, 2020, 01:43:58 am »
oooooooohhhhhhhhhhh...  |O

how did I not see the cathode down there and thought that those 2 plates were cathodes  :-//
thanks, now I get it!
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