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  • SergioL41 commented on thobson's instructable Building A Stereo Tube Amp10 months ago
    Building A Stereo Tube Amp

    You have a problem here.. When you mesure a tube amp their characteristics, seems ugly, they are insane bad compared with a transistor, or even a mosfet amplifiers giving a distortion 10 or even 100 times more, reaching 5% of THD, and so on. You are right, you mesure it.. But than, you feed your good music source in the transistor amp, and in the old bad, nostalgic, archaic, inefficient, power consuming, ugly, tube amp, lets say a good japanese stereo 300B SE with a power output of 10W per channel, or a more powerful Macintosh 450, without ANY tone control, and play a Toccata, or some Bach, recorded from an OLD 4 track tape..played from an AKAY 4000DS... in a good OLD fashioned pair of speakers, yes, 2 channels, 2 speakers...Play, than pay close attention to the sound, of every instrume...see more »You have a problem here.. When you mesure a tube amp their characteristics, seems ugly, they are insane bad compared with a transistor, or even a mosfet amplifiers giving a distortion 10 or even 100 times more, reaching 5% of THD, and so on. You are right, you mesure it.. But than, you feed your good music source in the transistor amp, and in the old bad, nostalgic, archaic, inefficient, power consuming, ugly, tube amp, lets say a good japanese stereo 300B SE with a power output of 10W per channel, or a more powerful Macintosh 450, without ANY tone control, and play a Toccata, or some Bach, recorded from an OLD 4 track tape..played from an AKAY 4000DS... in a good OLD fashioned pair of speakers, yes, 2 channels, 2 speakers...Play, than pay close attention to the sound, of every instrument that is in the music, you will hear the noise of the arc touching the strings in the violin, the hammer beating in the piano,sometimes nail hitting the keys, the sound of the wood vibrating in the celo... the wispper in the trumpet, and the hand that dumped the thunder from the drums.... than you will UNDERSTAND, that music is for HUMAN EARS and HUMAN BRAIN, is not for a THD meter... Music is SUBJECTIVE, one likes, others not, but for the majority of people that LIKES classical, TUBE rules, seems like it is the DISTORTION of the tube that gives that "high" in the music played... No feedback, no phase compensation, no tone control, just the sound, its like the amplifier is some kind of instrument, that takes part in the show, not simple a block of components that reproduces the sound... the Tube amp is PART of the music...In my time they used to say that transistor amp performs heavenly in the THD meter but sounds like HELL when you try to hear music on it.. and that is true, that is why they made POP, and FUNK, RAP... That kind of NOISE is not music, its is compressed, to have be played as loud as possible and so does not have a Dynamic range... this site explains:http://www.cnet.com/news/compression-is-killing-your-music/Transistor amp have high noise (that ssssshhhhh in the speakers...) , so the music must be played at some volume higher than the noise they produce... so for things work, music must be compressed... and today it is very difficult you find a music that was not compressed, so the classics from the 1950, and 1960 that was recorded in analogic, does not have compression, because as at that time the amp was all Tubes, there was no need to compress it...Today, I think it is impossible, unless YOU RECORD the music...

    You have a problem here.. When you mesure a tube amp their characteristics, seems ugly, they are insane bad compared with a transistor, or even a mosfet amplifiers giving a distortion 10 or even 100 times more, reaching 5% of THD, and so on. You are right, you mesure it.. But than, you feed your good music source in the transistor amp, and in the old bad, nostalgic, archaic, inefficient, power consuming, ugly, tube amp, lets say a good japanese stereo 300B SE with a power output of 10W per channel, or a more powerful Macintosh 450, without ANY tone control, and play a Toccata, or some Bach, recorded from an OLD 4 track tape..played from an AKAY 4000DS... in a good OLD fashioned pair of speakers, yes, 2 channels, 2 speakers...Play, than pay close attention to the sound, of every instrum...see more »You have a problem here.. When you mesure a tube amp their characteristics, seems ugly, they are insane bad compared with a transistor, or even a mosfet amplifiers giving a distortion 10 or even 100 times more, reaching 5% of THD, and so on. You are right, you mesure it.. But than, you feed your good music source in the transistor amp, and in the old bad, nostalgic, archaic, inefficient, power consuming, ugly, tube amp, lets say a good japanese stereo 300B SE with a power output of 10W per channel, or a more powerful Macintosh 450, without ANY tone control, and play a Toccata, or some Bach, recorded from an OLD 4 track tape..played from an AKAY 4000DS... in a good OLD fashioned pair of speakers, yes, 2 channels, 2 speakers...Play, than pay close attention to the sound, of every instrument that is in the music, you will hear the noise of the arc touching the strings in the violin, the hammer beating in the piano,sometimes nail hitting the keys, the sound of the wood vibrating in the celo... the wispper in the trumpet, and the hand that dumped the thunder from the drums.... than you will UNDERSTAND, that music is for HUMAN EARS and HUMAN BRAIN, is not for a THD meter... Music is SUBJECTIVE, one likes, others not, but for the majority of people that LIKES classical, TUBE rules, seems like it is the DISTORTION of the tube that gives that "high" in the music played... No feedback, no phase compensation, no tone control, just the sound, its like the amplifier is some kind of instrument, that takes part in the show, not simple a block of components that reproduces the sound... the Tube amp is PART of the music...In my time they used to say that transistor amp performs heavenly in the THD meter but sounds like HELL when you try to hear music on it.. and that is true, that is why they made POP, and FUNK, RAP... That kind of NOISE is not music, its is compressed, to have be played as loud as possible and so does not have a Dynamic range... this site explains: http://www.cnet.com/news/compression-is-killing-yo...Transistor amp have high noise (that ssssshhhhh in the speakers...) , so the music must be played at some volume higher than the noise they produce... so for things work, music must be compressed... and today it is very difficult you find a music that was not compressed, so the classics from the 1950, and 1960 that was recorded in analogic, does not have compression, because as at that time the amp was all Tubes, there was no need to compress it...Today, I think it is impossible, unless YOU RECORD the music...

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