Is Thier Away To Clear Up Distortion???

[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

 

[ilimzn]

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

 

[Dave Cigna]

http://www.diyaudio.com/forums/showthread.php?s=&threadid=38278

 

[prorms]

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]

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]

http://www.amazon.com/Valve-Amplifi...0175920?ie=UTF8&s=books&qid=1193099708&sr=8-1

 

[Miles Prower]

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]

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

 

[6f6]

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.]

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.

 

[unclejed613]

or try something similar to the circuit shown below. it has fair (not great, but what do you expect at 12V?) gain, and .2% distortion.





you don't have any grid bias in your circuit. that's why your preamp distorts.

 

[prorms]

not one tube amp have lethal voltages??????

 

[ilimzn]

or try something similar to the circuit shown below.
...
you don't have any grid bias in your circuit. that's why your preamp distorts.

Well, you don't have any grid bias for the top triodes either, or rather, you have grid leak bias of sorts. The capacitors should be replaced by grid stopper resistors on the order of 100 ohms...