Favorite Small Signal Transistors per use

[altec9440]

which small signal transistors do you choose versus type of input stage (single, ltp...)?

 

[indianajo]

I use MPS8099 npn or MPS8098 pnp. Quiet, high gain, $8 a hundred for the 8099. Have enough Vceo to stand off a 70 v rail without damage. The 8098 were $35 a hundred, so pnp I use MPSA56 that were $11 a hundred. I build primarily single ended amps to cut the number of wires I have to solder, since all pcb's are imports from somewhere I don't respect. My transistors were packaged in PHI before that fab was shut down.

 

[altec9440]

thanks for reply : I didn't expected MPS8099 in the race but I will add in opportunity list to play with.

surfing among posts I also found this list :
Single MPSA18
LTP BC550C, BC560C
Cascode KSC3503, KSC1845
CM BC560C, KSA992
VAS BC560C, KSA1381E
CCS KSC3503D

Any correction or completion

 

[wg_ski]

MPS8099/8599 aren’t as universally available as they used to be. They were back in the day, and they are low noise. Even the MPSA06/56 are being phased out in TO-92 (still widely available in surface mount). My go-to input transistors have been the C1945/A992, for both singletons and diff pairs in mission-critical circuits. Not long ago I did a lifetime buy of C1008/A708 for duties which call for the A06/A56. I don’t even expect them to be around very much longer.

 

[altec9440]

Yes most transistors listed are obsolete. Only C1845/A992 and BC550C are available through usuals providers. A good raison to record alerts on local ads

Audio market may be less attractive for big semiconductors company. May be opportunity for specialized ones (That, Cool Audio...).

did not found noise level for MPS8099/8599 and C1008/A708...

add MPSA06/56 for single/LTP
add from PM, 2SC2240/2SA970 for LTP

More opinions

 

[osscar]

I like BC 550/560 ; MPS8099/89 and NP favorite ZTX 450/451 or 550/551