Tube parameter ?

woody · 6th April 2004, 11:56 AM

I have been looking at a GS-35b russian triode and have the data sheets but they are in a little different form than what I need. I need the plate resistance, mu and tranconductance how can I convert mutual conductance to tranconductance?

Thanks in advance ,

Woody

James D. · 6th April 2004, 12:22 PM

Hi Woody,

mutual conductance and transconductance are basically the same and are both expressed in mA/V so for the GS-35b it ranges from 25-40mA/V.

I don't know mu or Rp for this tube but using the plate curves at 0V grid bias, inspection gives Rp as 4k so mu would be between 6-10.

Hope this helps

ciao

James

cogsncogs · 7th April 2004, 06:35 AM

Hello

Just to throw out a few formulas:

Rp = u/Gm
Gm = u/Rp
u = Rp x Gm

Wayne

6th April 2004, 11:56 AM	#1
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Tube parameter ? I have been looking at a GS-35b russian triode and have the data sheets but they are in a little different form than what I need. I need the plate resistance, mu and tranconductance how can I convert mutual conductance to tranconductance? Thanks in advance , Woody

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6th April 2004, 12:22 PM	#2
James D. diyAudio Member Join Date: Nov 2002 Location: North Herts, UK	Hi Woody, mutual conductance and transconductance are basically the same and are both expressed in mA/V so for the GS-35b it ranges from 25-40mA/V. I don't know mu or Rp for this tube but using the plate curves at 0V grid bias, inspection gives Rp as 4k so mu would be between 6-10. Hope this helps ciao James

7th April 2004, 06:35 AM	#3
cogsncogs diyAudio Member Join Date: Jul 2003 Location: Wayne, West Virginia	Hello Just to throw out a few formulas: Rp = u/Gm Gm = u/Rp u = Rp x Gm Wayne