What would be the 'best' Sansui amplifier for sound quality?

[jowanger]

Help with sansui au-u 907dr replacement transistors part numbers original part #lapt2 npn and lapt 2 pnp thank you.

 

[jmjrcv]

You will get more help if you start a new thread with your question since this thread is for a completely different topic.

 

[Plimpington2]

There has been much written here of the alpha series 907 variants, mostly of the MR and NRA. Can anyone speak intelligently of the a907dr? In what way does this differ from the MR and NRA? Do these suffixes actually stand for anything. I imagine MOS stands for mosfet.

 

[Sansuiman]

MOS is definitely a designator of a MOSFET output stage. I cannot speak to the significance of the other suffixes used during the late alpha period, as I've never seen anything that even speculates on what they may mean. Obviously, the II (Roman numeral 2) suffix designates a second revised "edition" of a design.

 

[JimEGR]

Yhere has been much written here of the alpha series 907 variants, mostly of the MR and NRA. Can anyone speak intelligently of the a907dr? In what way does this differ from the MR and NRA? Do these suffixes actually stand for anything. I imagine MOS stands for mosfet.

Here is the JDM Alpha chronology with hyperlinks for model specific details.

1986 AU-a907 180 watts (JDM)
1987 AU-a907i 160 watts (JDM)
1988 AU-a907 Extra - (JDM) likely not mass produced or sold commercially
1989 AU-a907L Extra 160 watts (JDM)
1989 AU-a999DG 95 watts (JDM)
1990 AU-a907DR 160 watts (JDM)
1992 AU-a907KX160 watts (JDM)
1993 AU-a907XR Series 160 watts (JDM)
1994 AU-a907 Limited 80 watts (JDM)
1995 AU-a907MR 160 watts (JDM)
1996 AU-07 Anniversary 90 watts (JDM)
1998 AU-a907NRA 160 watts (JDM)
1999 AU-a607 NRA ii 80 watts (JDM)
1999 AU-a607 MOS Limited 50 watts (JDM)