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Review and Measurements of vintage Yamaha AX-396 integrated amplifier
- Thread starter pma
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- #102
Standard IMD tests - DIN 250Hz+8kHz and SMPTE 60Hz+7kHz (repeated on Sep 29,2021)
This again remained me that we have to be humble and to perform all kinds of well established tests. This would cover THD+N vs. amplitude, THD+N vs. frequency, SMPTE IMD, DIN IMD, CCIF IMD, multitone and spectra at various output level. None of them to be omitted. If we omit some of the tests, we may overlook some hidden design issue.
This again remained me that we have to be humble and to perform all kinds of well established tests. This would cover THD+N vs. amplitude, THD+N vs. frequency, SMPTE IMD, DIN IMD, CCIF IMD, multitone and spectra at various output level. None of them to be omitted. If we omit some of the tests, we may overlook some hidden design issue.
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Hi,
I just wanted to say thank you for all the discussion here. I have rebiased my amplifier to ~10mV by following some of the advice here and from the service manual. When i first measured the channels they were at 2.1mV and 1.5mV. I have made absolutely no objective testing but have convinced myself there is an improvement! It's good to know I don't have a junker here, i bought it new about 23 years ago.
I've never rebiased an amplifier before, I appreciate how easy you guys made it sound.
I just wanted to say thank you for all the discussion here. I have rebiased my amplifier to ~10mV by following some of the advice here and from the service manual. When i first measured the channels they were at 2.1mV and 1.5mV. I have made absolutely no objective testing but have convinced myself there is an improvement! It's good to know I don't have a junker here, i bought it new about 23 years ago.
I've never rebiased an amplifier before, I appreciate how easy you guys made it sound.
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