Help requested for transistors replacement

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Hi everyone,


I am thinking to tweak a Sony CD payer, among other mods (caps, OP amps, bypass...) I would like to try better transistors. The original parts are:

-"3901 5H" tripods (seem to be 2sc3901 "PNP / NPN EPITAXIAL PLANAR SILICON TRANSISTORS").

-"A144 ESF" small size tripods, I ignore what they are

-"C144" small size tripods, I ignore what they are.

-"B1041 RF" (TO-92L format tripod) which seems to be 2SB1041 "1.2W PACKAGE POWER TAPED TRANSISTOR DESIGNED FOR USE WITH AN AUTOMATIC PLACEMENT MECHINE"

-NEC "C3514" (TO-220 format), which seems to be "2SC3514"

-"D 1944", seems to be 2SD1944 made by ROHM.

-"A1048", seems to be 2SA1048.


Which parts would improve quality ?


Thanks in advance. 🙂
 
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