What resistor type changes would peak the AKSA s performance?
R1, 47 kOhm, could be replaced with a Kiwame, or Holco/Vishay. R3, R4, R9, R15, R5, R6 are also in this category; all keep the same values. Note that all values remain unchanged. Resistor values don’t change, even with better quality components. Emitter resistors, R16 and R18, could be replaced with non-inductive ones; there are a variety of versions here; take a look at the Michael Percy .pdf catalogue. Further improvements, very subtle, can be gained by using tantalum resistors, ( Warning, Will Robinson, Warning: extreme financial danger – these are expensive! ), in the position of R1(47 kOhm), R3(68 kOhm), R4(3.3 kOhm), R15(180 Ohms) and R5/R6 (the bootstrap resistors). Finally, resistors which give some benefit, very slight, are the emitter resistors. If you use a thick film or non-inductive wirewound resistor in this role it does sound slightly better, but it’s hard to hear.