Triode Emulator

dimitri · 22nd May 2004, 01:03 PM

I have some reprints left from Berlin AES convention named "Triode Emulator," which I can send to interested persons by ordinary mail free of charge. The design for a low-noise amplifier is presented. The amplifier has a tube-like transfer characteristic and produces harmonic distortion components that are similar to triode preamplifier. You can find my e-mail on my home page. Please no request for preprint in electronic form, I don't have it.

dimitri · 25th May 2004, 11:29 AM

light tickle

pekka · 26th May 2004, 06:24 AM

I only get the following error message when I try to contact you: "Sorry! That user has specified that they do not wish to receive emails through this board. " Could you check your settings?

As you may have guessed, I am interested in your paper.

Regards,
Pekka U.

lucpes · 26th May 2004, 07:21 AM

@pekka:

Quote:

Originally posted by dimitri
You can find my e-mail on my home page.

http://www.angelfire.com/az3/dimitri/

pekka · 26th May 2004, 08:01 AM

Thanks, lucpes

I had checked Dimitri's homepage but did not notice his e-mail address... must have been my tired eyes.

Regards,
Pekka

dimitri · 2nd June 2004, 05:51 PM

The idea is very simple

. FET common source stage without source resistor has quadratic transfer characteristic. FET common source stage with rather large source resistor has about linear transfer characteristic. For some intermediate value

of source resistor the transfer function becomes close to three halves power law, which is typical for vacuum triode.

ashok · 3rd June 2004, 04:25 AM

Hi Dimitri,
The mail arrived yesterday ( 2nd June) .
Thanks.
Very interesting . Was wondering how this would sound ahead of a normal power amp !
Cheers,
Ashok.

Nelson Pass · 3rd June 2004, 06:54 PM

Quote:

Originally posted by dimitri
The idea is very simple . FET common source stage without source resistor has quadratic transfer characteristic. FET common source stage with rather large source resistor has about linear transfer characteristic. For some intermediate value of source resistor the transfer function becomes close to three halves power law, which is typical for vacuum triode.

In this case, you can play with the effect by varying the
bias current and quiescent voltage and output level to
approximate just about anything you want.

dimitri · 4th June 2004, 07:21 AM

I wouldn't argue against this, yes, we can take essentially nonlinear BJT with exponent transfer function and approximate just about anything.
The question is what will be the input/output ranges for such approximation? Will they wide enough to have the practical application? Can we stabilize the operating point exactly within required range?

dimitri · 1st July 2004, 04:29 PM

several copies are still waiting...

22nd May 2004, 01:03 PM	#1
dimitri diyAudio Member Join Date: Oct 2002 Location: retired	Triode Emulator I have some reprints left from Berlin AES convention named "Triode Emulator," which I can send to interested persons by ordinary mail free of charge. The design for a low-noise amplifier is presented. The amplifier has a tube-like transfer characteristic and produces harmonic distortion components that are similar to triode preamplifier. You can find my e-mail on my home page. Please no request for preprint in electronic form, I don't have it.

26th May 2004, 06:24 AM	#3
pekka diyAudio Member Join Date: Apr 2002 Location: Espoo (next to Helsinki)	Something wrong with your e-mail settings? I only get the following error message when I try to contact you: "Sorry! That user has specified that they do not wish to receive emails through this board. " Could you check your settings? As you may have guessed, I am interested in your paper. Regards, Pekka U.

26th May 2004, 08:01 AM	#5
pekka diyAudio Member Join Date: Apr 2002 Location: Espoo (next to Helsinki)	Ooops... Thanks, lucpes I had checked Dimitri's homepage but did not notice his e-mail address... must have been my tired eyes. Regards, Pekka

3rd June 2004, 04:25 AM	#7
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Maill arrived. Hi Dimitri, The mail arrived yesterday ( 2nd June) . Thanks. Very interesting . Was wondering how this would sound ahead of a normal power amp ! Cheers, Ashok. __________________ AM

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25th May 2004, 11:29 AM	#2
dimitri diyAudio Member Join Date: Oct 2002 Location: retired	light tickle

2nd June 2004, 05:51 PM	#6
dimitri diyAudio Member Join Date: Oct 2002 Location: retired	The idea is very simple . FET common source stage without source resistor has quadratic transfer characteristic. FET common source stage with rather large source resistor has about linear transfer characteristic. For some intermediate value of source resistor the transfer function becomes close to three halves power law, which is typical for vacuum triode.

4th June 2004, 07:21 AM	#9
dimitri diyAudio Member Join Date: Oct 2002 Location: retired	I wouldn't argue against this, yes, we can take essentially nonlinear BJT with exponent transfer function and approximate just about anything. The question is what will be the input/output ranges for such approximation? Will they wide enough to have the practical application? Can we stabilize the operating point exactly within required range?

1st July 2004, 04:29 PM	#10
dimitri diyAudio Member Join Date: Oct 2002 Location: retired	several copies are still waiting...

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