A decent tube amp? "Worldwide 300B Builders" - Page 2 - Electronic Circuits Projects Diagrams Free

audioguru · 6th July 2008, 02:33 PM

I recall seeing the gas inside the output tubes of my amplifier glowing purple.

Harmonics are distortion. Solid state amps have extremely low distortion, much less than tube amps. The tubes and the output transformer were non-linear. The output transformer provides poor damping of the resonances of speakers. Solid state amps provide excellent damping.

**Nigel Goodwin** · 6th July 2008, 03:34 PM

Quote:

Originally Posted by Centretek

Valve amps are inherently better sounding because they don't generate odd harmonics like semiconductor devices because of the difference in inter-electrode capacitance.

So 0.001% odd harmonic distortion from a transistor amp sounds worse than 10% even harmonic distortion from a valve amp? - I don't think so!

audioguru · 6th July 2008, 03:48 PM

A single-ended tubes or transistors amp produces even harmonics distortion. When they are operated push-pull then the even harmonics cancel and the result is a form of compression of the higher currents which results in odd harmonics distortion.

The phase-shift in the output transformer of a tubes amp limits the amount of negative feedback that is used so the distortion is much higher than a transistors amp.

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6th July 2008, 02:33 PM	(permalink)
audioguru	I recall seeing the gas inside the output tubes of my amplifier glowing purple. Harmonics are distortion. Solid state amps have extremely low distortion, much less than tube amps. The tubes and the output transformer were non-linear. The output transformer provides poor damping of the resonances of speakers. Solid state amps provide excellent damping. __________________ Uncle $crooge

6th July 2008, 03:48 PM	(permalink)
audioguru	A single-ended tubes or transistors amp produces even harmonics distortion. When they are operated push-pull then the even harmonics cancel and the result is a form of compression of the higher currents which results in odd harmonics distortion. The phase-shift in the output transformer of a tubes amp limits the amount of negative feedback that is used so the distortion is much higher than a transistors amp. __________________ Uncle $crooge