Not connecting grids/anode can hurt tube?

Redemption · 13th January 2004, 08:25 PM

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

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

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

13th January 2004, 08:25 PM	#1
Redemption diyAudio Member Join Date: Jan 2004 Location: Netherlands	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

13th January 2004, 09:00 PM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	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.

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13th January 2004, 09:03 PM	#3
Redemption diyAudio Member Join Date: Jan 2004 Location: Netherlands	Okay, thanks! -- Charl

14th January 2004, 10:33 AM	#6
fscarpa58 diyAudio Member Join Date: Nov 2003 Location: Genova, Italy	I learned something new today thank you Federico

14th January 2004, 11:20 AM	#7
Redemption diyAudio Member Join Date: Jan 2004 Location: Netherlands	Tube I'm using is the ECH83. -- Charl