Your Favorite Signal, Driver & Power Transistor used in your Amp and Why?

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John Biles

John Biles

Member
2005-05-18 4:17 am
Victoria Australia
  • #1
    Hello Everyone,
    If this Question has been asked before can you please let me know where the link is.
    My question is with all the Amplifiers that have been built by Members on this forum, you all must have a favorite Signal, Driver Power transistor that you continue to use because it's reliable, gives for your Amplifier the best sound.
    There must also be some disappointing Transistors out there as well, that you wouldn't used again.

    I would like to know so that i can test these transistors in my design.
     
    T

    tlf9999

    Disabled Account
    2005-05-25 2:25 am
    none
  • #2
    Signal: 2n5401/5551 - have plenty of them. realiable and get the job done just fine.
    Driver: 15030/31 - have plenty of them. reliable and get the job done just fine. I also use to220 MOSFETs ocassionally.
    Power: usually some power MOSFETs. today's favorite is FQA19N20.
     
    edl

    edl

    Member
    2004-10-19 2:35 pm
  • #4
    Signal:
    -bc546/556 (bc212/182): cheap, realiable. good for max. 60V rails
    -2n4401/5551: higher Uceo

    Medium:
    -bd139/140: cheap, realiable. good for max. 40V rails
    -mje340/350: very high Uceo

    Driver:
    -bd239c/240c - bd241c/242c - bd243c/244c: these are old, "slow" devices, but they are so cheap, and do the job well with lower (max. 40-50V) rails.
    -mje15030/15031: one of the best drivers

    Power:
    -2sc5200/2sa1943: good price, fast, easy to mount
    -mj15003/15004: very hard to kill, greeat SOA. for rails up to +/70V.
    -mj15022/mj15023 - mj15024-mj15025: they are excellent for high power amps, for high rails (+/-100V)
    -mj15015/mj15016: I'm using two pairs for 200W PA amps. cheap devices.
    -bd911/912 - bd249c/250c: good old devices for little amps.

    Be careful, there are a lot of fake power transistors in the shops!
     
    B

    bocka

    Member
    2003-07-05 11:13 am
    Hannover
    www.synertronixx.de
  • #8
    My question is with all the Amplifiers that have been built by Members on this forum, you all must have a favorite Signal, Driver Power transistor that you continue to use because it's reliable, gives for your Amplifier the best sound.
    Click to expand...

    This is mainly a quastion of your topology not only of the devices used. You can make a good as well as a mediocre amp with all the devices listed above. A transistor must fit your design criteria first. After choosing your favored device you should change parts and listen if they sound better. It's impossible to say that transistor A sounds better than transistor B or vice versa.

    The only statement that can be given is that device A or can handle your desired output power, voltage, speed... or not. Or that the ß is sufficiant, has a low/high input/reverse/output capacitance and so on.

    Yes, I've also prefered devices, because I've a lot of them.

    Small signal

    2SK389/2SJ109
    ZTX450/ZTX550
    2N5401/2N5551

    Medium Power

    MJE15034 / MJE15035
    2SA1930/2SC5171

    Power

    MJL1302/MJL3281
    2SA1943/2SC5200

    A lot of devices for enough permutations. Maybe you can do something uncommon like using MJL1302 and 2SC5200 in your output stage?
     
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