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AU-919 Worst Case Scenario

JoseHH said:
Nothing personal about NTE. The rationale is that these NTE parts are very different from the parts of the other channel with ft= 4MHz. The NMA1012/NMC1012 have a transition frequency close to 30MHz, and this is one of the distinctive features of these amplifiers. Sanken initially made the NMA/NMC specially for Sansui with a non magnetic case, but continued production of similar parts, first in standard TO-3 case (2SC2606/7, 2SA1116/7, discontinued them and keep producing equivalent parts TO-3p until recently.
Remember that the transistor with ft=4MHz starts to roll off at a frequency fc=ft/hfe which would be lower than 100KHz for the NTE parts. This speed, or slew rate limitation imparts distortion components in the audible range for reasons that have been discussed in other threads in this forum. Besides this, some claim that they hear the difference between an amplifier with the original fast transistors and one with the 4MHz devices.
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Thank you, great explanation.
 
JohnT123 said:
IF the outputs test good why do you need to change them? Is it because you should do both sides with the same type of output devices or is it because you all hate NTE products? I'm confused.
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Both. Plus if I see NTE anywhere, I know the prior tech had about three brain cells firing.

Jose cleared it up as well. The AU-919, AU-X1, and others are very particular if you do some reading in the Sui forum.
 
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