Driver for a 807 em triode mode...help !!!

aldovan · 3rd October 2011, 09:54 PM

Friends

To excite a 807 in single-ended triode mode is best to use a preamplifier tube with low plate current or large plate current to compensate the capacitance of the grid ?

Thanks,

Aldovan

aardvarkash10 · 3rd October 2011, 09:56 PM

bigger is always better.

aldovan · 3rd October 2011, 10:00 PM

Quote:

Originally Posted by aardvarkash10

bigger is always better.

Thanks.
Them I will put a medium power pentode in triode mode as driver.
A El84 is fine ?

Aldovan

aardvarkash10 · 3rd October 2011, 11:06 PM

absolutely fine - probably overkill.

Alternatively, PowerDrive it, ie use a MOSFET as a follower to drive the 807 grid.

aldovan · 3rd October 2011, 11:08 PM

Quote:

Originally Posted by aardvarkash10

absolutely fine - probably overkill.

Alternatively, PowerDrive it, ie use a MOSFET as a follower to drive the 807 grid.

Mosfet ? Blargh, Mosfet is trash !

boywonder · 4th October 2011, 02:28 PM

Aldovan: Here are a few links well worth the read........

http://www.geofex.com/Article_Folder...osfetfolly.htm

PowerDrive

flatheadmurre · 4th October 2011, 05:56 PM

A have a stash of C3g usually works when other fails !!

artosalo · 4th October 2011, 06:15 PM

Triode connected 807 is not very difficult load since its mu is low, about 10.
Thus the Miller effect is not remarkable.

Any medium mu triode is suitable driver.

3rd October 2011, 09:54 PM	#1
aldovan diyAudio Member Join Date: Jul 2005 Location: Campo Grande city	Driver for a 807 em triode mode...help !!! Friends To excite a 807 in single-ended triode mode is best to use a preamplifier tube with low plate current or large plate current to compensate the capacitance of the grid ? Thanks, Aldovan

3rd October 2011, 09:56 PM	#2
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	bigger is always better. __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

3rd October 2011, 11:06 PM	#4
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	absolutely fine - probably overkill. Alternatively, PowerDrive it, ie use a MOSFET as a follower to drive the 807 grid. __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

4th October 2011, 02:28 PM	#6
boywonder diyAudio Member Join Date: Jan 2008 Location: So.Cal.	MOSFET follies and powerdrive Aldovan: Here are a few links well worth the read........ http://www.geofex.com/Article_Folder...osfetfolly.htm PowerDrive

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4th October 2011, 05:56 PM	#7
flatheadmurre diyAudio Member Join Date: Mar 2011 Location: Jarna	A have a stash of C3g usually works when other fails !!

4th October 2011, 06:15 PM	#8
artosalo diyAudio Member Join Date: Feb 2010	Triode connected 807 is not very difficult load since its mu is low, about 10. Thus the Miller effect is not remarkable. Any medium mu triode is suitable driver.

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