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2sd427

  1. mauser

    Replacements for 2SB557 and 2SD427 transistors

    Hello, I have some dead transistors in a Sherwood S-9910, and am looking for a viable new replacement, since it seems that Chinese counterfeit transistors are actually a thing. I have seen 2 different sets of transistors mentioned consistently in the forums, and am interested in the difference...
    • mauser
    • Thread
    • 2sb557 2sd427 replacement s-9910 sherwood transistors
    • Replies: 4
    • Forum: Solid State
  2. Mike Sweeney

    HFE question

    I'm looking at two subs for the 2SD427/2SB557 NPN/PNP transistors for a Marantz 2285B. The specs on the two are the same ( 250 volts, 16amps, 4Mhz, 250 watts) except for the HFE rating. The OEM was >20 at 5 volts. One sub is 25@5 volts.. but the other recommended is 15@4 volts. So my...
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