High bias point.

jnb · 7th June 2007, 03:51 AM

I am looking at biasing a 6SN7 with 240V from the anode to cathode, -9V on the grid and a little over 6mA of current.

I want to keep this grid voltage (is that reasonable). Would it be more linear if I lowered the anode voltage?

bigwill · 7th June 2007, 08:58 AM

I'm a big tube newbie myself but I think this info can be ascertained by looking at the triode curves

jnb · 7th June 2007, 09:06 AM

I'm looking for opinions because some people seem to have their favourite bias points, and things aren't always as they seem. Other than that, I'd think you're right.

the_manta · 7th June 2007, 09:14 AM

Hi !
6J5/6SN7/7N7: Stay generally above 9mA. The curves are VERY linear there.
I expecially prefer higher voltages. I have about -6V Ug1 and bit over 200V because of execellent linearty in this region.

Regards, Simon (

Kent Smith · 7th June 2007, 03:39 PM

I agree.... running triodes HOT usually seems best for me!

It's only too much current if the plates start dripping!

7th June 2007, 03:51 AM	#1
jnb diyAudio Member Join Date: Dec 2006	High bias point. I am looking at biasing a 6SN7 with 240V from the anode to cathode, -9V on the grid and a little over 6mA of current. I want to keep this grid voltage (is that reasonable). Would it be more linear if I lowered the anode voltage?

7th June 2007, 09:14 AM	#4
the_manta diyAudio Member Join Date: Nov 2006 Location: Munich, Bavaria	Hi ! 6J5/6SN7/7N7: Stay generally above 9mA. The curves are VERY linear there. I expecially prefer higher voltages. I have about -6V Ug1 and bit over 200V because of execellent linearty in this region. Regards, Simon ( __________________ Терпенье и труд все перетрут

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to figure out the bias point of fisher X-100A	pchw	Tubes / Valves	32	11th July 2010 05:37 PM
Finding bias point in PP fixed bias	beamnet	Tubes / Valves	14	7th December 2008 01:25 PM
It plays! Break in / bias point (SimpleSE)	Zap	Tubelab	19	27th June 2008 07:04 PM
EL84 bias point	Klimon	Tubes / Valves	2	2nd November 2006 07:42 PM
The best bias point for KT88	rossdt	Tubes / Valves	0	27th July 2006 06:24 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

7th June 2007, 08:58 AM	#2
bigwill diyAudio Member Join Date: Dec 2004 Location: UK	I'm a big tube newbie myself but I think this info can be ascertained by looking at the triode curves

7th June 2007, 09:06 AM	#3
jnb diyAudio Member Join Date: Dec 2006	I'm looking for opinions because some people seem to have their favourite bias points, and things aren't always as they seem. Other than that, I'd think you're right.

7th June 2007, 03:39 PM	#5
Kent Smith diyAudio Member Join Date: Jun 2004 Location: Wylie, Texas	I agree.... running triodes HOT usually seems best for me! It's only too much current if the plates start dripping!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)