Hi people.
I am new here.
The first - I am here to question about tube amps.
For years i have been reading on the web about
tube amps, and its comparation with SS amps.
It sounds like an endless discussion.
I am not a professional in audio.
But i know almost every guitarrist want to have
a good distortion of tube amps.
I do not have one tube amp.
All i know, after years of readings, maybe can be expressed
in a few lines.
- EVERY AMP GIVES SOME TYPE OF DISTORTION
AND TUBE AMP GIVES GOOD DISTORTION FOR GUITAR
- tube produces distortion with low harmonics
- tube produces distortion with EVEN harmonics
- tube gives large headroom (very good for audio)
- It is easier to implement tube amps compared to SS
- Good amps demands excelent electric source
- the output transformer affects the sound
- tubes are high impedance input
- tubes have capacitances that affect the sound
- output power tubes acopled with transformers give only odd harmonics
- With overload, EACH stages of tube amp give some amount of distortion. At the end the distortion
is very complex.
- When overloaded tube can have some sort of DC bias shifting
- Math associated with audio amps are complex and few people likes it
- Triode tube can exibit three halfes power law curve
- IMPORTANT: MID booster for guitar will do an amplifier distortion more assymetric.
Besides everything else, reading dimitri ideas about triode emulation
i got really interested.
I did contact to him. He is very gentle and intelligent and the idea is very interesting.
I would to thanks him and the other guys who share ideas here.
He has a lot of posts here.
I would say that i have tried a simple FET PREAMP with low source resistor and
a proper drain resistor in computer simulation (CIRCUITMAKER).
I got distortion of second harmonic followed by less third harmonic.
In practice, things sounded pretty nice for a simple fet preamp.
Some guys have made attempts to get one aproximation of tube amps with FET transistor.
The reviews say that they do not exibit the same tone and distortion. Even though they are
good in tone and distortion.
I must be very careful here........
FIRST QUESTION.
Somebody out there has tried FET emulation (sorry by this expression) for a tube amp ?
(this may sound crazy for some of you)
SECOND QUESTION.
Is it someway (technically) possible to simulate an entire tube amp in distortion ?
Without tubes of course.
If these question can be answered, I WILL GIVE UP searching for emulation of tubes.
I HAVE SOMETHINGS TO SAY ABOUT TUBES, JUST TO JUSTIFY MY QUESTIONS.
- TUBES AND GOOD OUTPUT TRANSFORMERS ARE REALLY HARD TO FIND HERE IN BRAZIL.
- TUBES WORK WITH HIGH VOLTAGES (that i dislike)
- TUBE AMP IS A BIG BOX WITH PARTICULAR TYPE OF SOUND (EVEN THOUGH IT IS GOOD)
I must warn that i know ideas from:
John Murphy duty cycle from CARVIN about SX100,SX200,SX300 amps.
Stephan Moeller with VOX ac30 sim.
Gabe Velez with fet buffering bipolar junction transistor.
Nad soft clipping schem.
Pritchard and his patents.
Lots of related patents.
((((((Thanks to all these guys.)))))))
GOOD LUCKY FOR ALL (KEEP STUDYING)
[email protected]
http://geocities.yahoo.com.br/rmfidelis/TubeSimulator.html
I am new here.
The first - I am here to question about tube amps.
For years i have been reading on the web about
tube amps, and its comparation with SS amps.
It sounds like an endless discussion.
I am not a professional in audio.
But i know almost every guitarrist want to have
a good distortion of tube amps.
I do not have one tube amp.
All i know, after years of readings, maybe can be expressed
in a few lines.
- EVERY AMP GIVES SOME TYPE OF DISTORTION
AND TUBE AMP GIVES GOOD DISTORTION FOR GUITAR
- tube produces distortion with low harmonics
- tube produces distortion with EVEN harmonics
- tube gives large headroom (very good for audio)
- It is easier to implement tube amps compared to SS
- Good amps demands excelent electric source
- the output transformer affects the sound
- tubes are high impedance input
- tubes have capacitances that affect the sound
- output power tubes acopled with transformers give only odd harmonics
- With overload, EACH stages of tube amp give some amount of distortion. At the end the distortion
is very complex.
- When overloaded tube can have some sort of DC bias shifting
- Math associated with audio amps are complex and few people likes it
- Triode tube can exibit three halfes power law curve
- IMPORTANT: MID booster for guitar will do an amplifier distortion more assymetric.
Besides everything else, reading dimitri ideas about triode emulation
i got really interested.
I did contact to him. He is very gentle and intelligent and the idea is very interesting.
I would to thanks him and the other guys who share ideas here.
He has a lot of posts here.
I would say that i have tried a simple FET PREAMP with low source resistor and
a proper drain resistor in computer simulation (CIRCUITMAKER).
I got distortion of second harmonic followed by less third harmonic.
In practice, things sounded pretty nice for a simple fet preamp.
Some guys have made attempts to get one aproximation of tube amps with FET transistor.
The reviews say that they do not exibit the same tone and distortion. Even though they are
good in tone and distortion.
I must be very careful here........
FIRST QUESTION.
Somebody out there has tried FET emulation (sorry by this expression) for a tube amp ?
(this may sound crazy for some of you)
SECOND QUESTION.
Is it someway (technically) possible to simulate an entire tube amp in distortion ?
Without tubes of course.
If these question can be answered, I WILL GIVE UP searching for emulation of tubes.
I HAVE SOMETHINGS TO SAY ABOUT TUBES, JUST TO JUSTIFY MY QUESTIONS.
- TUBES AND GOOD OUTPUT TRANSFORMERS ARE REALLY HARD TO FIND HERE IN BRAZIL.
- TUBES WORK WITH HIGH VOLTAGES (that i dislike)
- TUBE AMP IS A BIG BOX WITH PARTICULAR TYPE OF SOUND (EVEN THOUGH IT IS GOOD)
I must warn that i know ideas from:
John Murphy duty cycle from CARVIN about SX100,SX200,SX300 amps.
Stephan Moeller with VOX ac30 sim.
Gabe Velez with fet buffering bipolar junction transistor.
Nad soft clipping schem.
Pritchard and his patents.
Lots of related patents.
((((((Thanks to all these guys.)))))))
GOOD LUCKY FOR ALL (KEEP STUDYING)
[email protected]
http://geocities.yahoo.com.br/rmfidelis/TubeSimulator.html