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"AMPLIFIER DESIGNS FOR REDUCED IMD"

AMPLIFIER DESIGNS FOR REDUCED IMD

https://www.electra-print.com/reduced_imd_amp.php

Electra-Print Audio has been investigating the effects, causes and reduction of IMD in tube amplifiers. The following is a list of causes and cures and low and low-rise IMD circuitry, in a practical application format. IMD being the modulation of high frequencies by the lower frequencies with a resulting sum and difference of many odd combinations of audible products. The standard measured value of IMD for very good performance of an SE amplifier is less than 2% at 1 watt and about 4% at the amplifier's mid-power level. For very low power amps, such as the 45 tube, 2% at .5 watt is used. All of our tests are done with, two tone, 60Hz/6kHz, 4:1, SMPTE standard signal. These amplifier designs do not use global negative feedback, common in push-pull amplifiers. Those amplifiers that use negative feed back show results with very low IMD as well but also generate artificial bandwidth and its resulting signal compression. This is at the expense of output power with a dependency on Nyquist phase analysis so that the amplifier will not oscillate.


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Topic - "AMPLIFIER DESIGNS FOR REDUCED IMD" - rage 06:05:43 11/19/21 (30)

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