Tube/Valve related question

[Papa_lazerous]

Ok here's the deal I have been doing allot of reading up on valves, nd I can honestly say I understand what goes on inside a basic triode Valve, but there is just one slight niggle in my mind at the moment

Take for example the 12AX7/ECC83 Valve, thats a dual Triode, inside the glass tube are they physically isolated from each other or something?  I am asking this as I know or at least believe there is no interaction between the 2 individual triodes in the tube so I am wondering what stops the flow of electrons say going from the cathode of one side to the plate of the other?  I hope this makes sense.  I think maybe there is something seperating them but then its a guess

[bancika]

well, there isn't shield in regular 12A*7, but Russian 6n2p (I mentioned them to you before) have internal shield between triodes which is connected to pin 9. This means that there's no heater center tap, so they can only work with 6.3V, but I think it's a fair price. Having shield is better
I'm not sure what keeps electrons from flowing to other cathode in regular 12AX7...

[Papa_lazerous]

Thanks for the reply mate 

[trevorus]

Chinese 12ax7's have a shield between the two sides.

[JimRayden]

The plate of each triode section surrounds it and sucks the electrons, letting very few go astray. They either boil around the cathode or get sucked into the plate.

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Jimbo

[Papa_lazerous]

The plate of each triode section surrounds it and sucks the electrons, letting very few go astray. They either boil around the cathode or get sucked into the plate.

---------
Jimbo

That makes sense cheers.

Just incase someone is interested and wants to broaden their hozizons I've been reading this.  Only upto the 6th Chapter so far printing off a chapter a night at work (its easie to read printed than on the screen)  Its an army training manual from the 50's on Valves Really good read so easy to understand

http://www.pmillett.com/Books/army_theory.pdf