Is Thier Away To Clear Up Distortion???

prorms · 22nd October 2007, 07:52 PM

I WAS WONDERING IS THIER A WAY TO CLEAR UP THE DISTORTION
ON THIS PREAMP IN PUT AT 10 mV Pk I think thier about 10% to 40% distortion this has been only simulated stage

ilimzn · 22nd October 2007, 11:13 PM

By giving the tube proper bias and plate voltages, for starters???

Dave Cigna · 22nd October 2007, 11:24 PM

On Line Tube Learning for newbies....

prorms · 22nd October 2007, 11:36 PM

http://www.mif.pg.gda.pl/homepages/frank/sheets/093/1/12AU7A.pdf

the data sheet link i can only go as high as 13.5 volts unless know a better tube that works at 12 v or so????
iam not sure were the bais is also thier an example application on that datasheet think i need to change the design fit more like the one in the datasheet ????????

do not build this preamp unless want a distored signal

also numbered the parts

ray_moth · 23rd October 2007, 12:15 AM

Don't be offended but you clearly don't know much at all about the use of tubes. They are not remotely like solid state devices and they can't be connected up in the same way. Rather than asking questions here, you might like to start by reading some informative literature until you understand it. There are plenty of helpful websites and I've found Max Robinson's 'Fun with Tubes' to be quite well-explained.

sorenj07 · 23rd October 2007, 12:18 AM

http://www.amazon.com/Valve-Amplifie...3099708&sr=8-1

Miles Prower · 23rd October 2007, 06:22 AM

Quote:

Originally posted by prorms
I WAS WONDERING IS THIER A WAY TO CLEAR UP THE DISTORTION
ON THIS PREAMP IN PUT AT 10 mV Pk I think thier about 10% to 40% distortion this has been only simulated stage

Yeah. Don't build it. That schemo is just soooooooooooooo wrong.

sorenj07 · 23rd October 2007, 07:16 AM

it is pretty wretched... maybe he can learn something though..

6f6 · 23rd October 2007, 08:49 PM

In all likelihood this device would not even turn "on". A triode tube operates somewhat like a depletion-mode n-channel FET. The 12v that you see is the reverse bias needed to operate the tube. The "drain" of a triode is is refered to as the plate; plates typically need 90- 250v in order to operate properly.

Jeb-D. · 23rd October 2007, 10:35 PM

If you want to do a 12V tube project check out the tubes mentioned on this page.

http://www.duntemann.com/12vtubes/12vtubesindex.htm

Most of the tubes can be found on ebay.

22nd October 2007, 11:24 PM	#3
Dave Cigna diyAudio Member Join Date: Oct 2003 Location: Finger Lakes, NY	On Line Tube Learning for newbies.... __________________ January 20, 2009: Bush's last day

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22nd October 2007, 11:13 PM	#2
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	By giving the tube proper bias and plate voltages, for starters???

23rd October 2007, 12:15 AM	#5
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	Don't be offended but you clearly don't know much at all about the use of tubes. They are not remotely like solid state devices and they can't be connected up in the same way. Rather than asking questions here, you might like to start by reading some informative literature until you understand it. There are plenty of helpful websites and I've found Max Robinson's 'Fun with Tubes' to be quite well-explained.

23rd October 2007, 12:18 AM	#6
sorenj07 diyAudio Member Join Date: May 2006	http://www.amazon.com/Valve-Amplifie...3099708&sr=8-1

23rd October 2007, 07:16 AM	#8
sorenj07 diyAudio Member Join Date: May 2006	it is pretty wretched... maybe he can learn something though..

23rd October 2007, 08:49 PM	#9
6f6 diyAudio Member Join Date: Oct 2006	In all likelihood this device would not even turn "on". A triode tube operates somewhat like a depletion-mode n-channel FET. The 12v that you see is the reverse bias needed to operate the tube. The "drain" of a triode is is refered to as the plate; plates typically need 90- 250v in order to operate properly.

23rd October 2007, 10:35 PM	#10
Jeb-D. diyAudio Member Join Date: Nov 2005 Location: SoCal	If you want to do a 12V tube project check out the tubes mentioned on this page. http://www.duntemann.com/12vtubes/12vtubesindex.htm Most of the tubes can be found on ebay.