AudioRoundTable.com: Thermionic Emissions » What is the input impedance of a 6sn7?

Home » Audio » Thermionic Emissions » What is the input impedance of a 6sn7?

Show: Today's Messages :: Navigator :: Polls
E-mail to friend

Re: What is the input impedance of a 6sn7? [message #9598 is a reply to message #9596]

Mon, 20 March 2006 07:20

Damir
Messages: 1005
Registered: May 2009

Illuminati (2nd Degree)

In normal operation (grid negative to cathode), input impedance of the 6SN7 triode (g1-ground) is close to infinity, or at least, very high.
Then grid-leak resistor (say 220k from g1 to ground) is actually our input impedance (220k in parallel with >>220k = 220k).
We have the "problem" with input capacitance (Cgk+Cstrays+Cmiller), say about 100pF for 6SN7. The easiest way with filter stages is to observe triode input like, say, 220k in parallel with 100pF.

Report message to a moderator

[Message index]

		What is the input impedance of a 6sn7? By: Tre' on Sun, 19 March 2006 19:33
		Re: What is the input impedance of a 6sn7? By: Damir on Mon, 20 March 2006 07:20
		Re: What is the input impedance of a 6sn7? By: Tre' on Mon, 20 March 2006 09:14

Previous Topic:	Schematic for Counterpoint SA 7
Next Topic:	Antique Sound Lab AQ 1006 845DT

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Jul 13 17:33:05 CDT 2024