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-   -   Not connecting grids/anode can hurt tube? (http://www.diyaudio.com/forums/tubes-valves/26000-not-connecting-grids-anode-can-hurt-tube.html)

Redemption 13th January 2004 08:25 PM

Not connecting grids/anode can hurt tube?
 
Hello folks,

I have a pentode/triode combination tube which runs on low voltages (12V anode). I am only using the triode for now. I didn't connect the grids and anode of the pentode, but since the triode and pentode share the kathode, electroncs are moving in the direction of those pentode grids...

Can this hurt the tube?

Greetings,
-- Charl

dhaen 13th January 2004 09:00 PM

Common cathode..
 
I don't see how any damage could be caused.
However, with the pentode's anode and grids floating, it could have a random effect on the triode's operation, so best to ground them.

Redemption 13th January 2004 09:03 PM

Okay, thanks!

-- Charl

fscarpa58 14th January 2004 08:16 AM

Quote:

but since the triode and pentode share the kathode
are you sure of this? strange!

bye

Federico

dhaen 14th January 2004 10:13 AM

shared cathode
 
Quote:

Originally posted by fscarpa58
[B]

are you sure of this? strange!

/B]
There have been a few valves like this.
The only B9A valve I know of is the ECL80.
Among 7 and 8 pin valves, Eg B7G, Octal it is necessary to share because there are not enough pins.

fscarpa58 14th January 2004 10:33 AM

I learned something new today

thank you

Federico

Redemption 14th January 2004 11:20 AM

Tube I'm using is the ECH83.

-- Charl


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