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  • LSK389 - diyAudio
    Introduction The LSK389 is the industry’s lowest noise Dual N-Channel JFET, 100% tested, guaranteed to meet 1 f and broadband noise specifications, while eliminating burst (RTN or popcorn) noise entirely The product displays high transconductance and very good matching It is the JFET of choice for low noise applications, especially those requiring a differential amplifier input stage
  • Measure IDSS and VGS (off) of JFET - diyAudio
    Hi guys, I got 2 LSK389C and I found they have trouble to amplify signals "LSK389 App Note Rev A4 New Format" page 9, figure 4 shows a differential
  • Better part National 2N5566, or Linear Systems LSK389?
    I guess lsk389 with it higher input C is better for low source Z, see Bob Cordell's lsk489 app note, a good read Click to expand I've read Cordell's notes, but still think that the LSK389 is a superior part to LSK489 LSK489 does not appear to be a drop in for 2N5564 either I guess I should clarify my OP
  • Which grade LSK389 to use for hybrid cascode a la Merlin B.
    I'm hoping that choosing the LSK389 two-matched-on-one-die version will save me some trouble getting stereo pairs The example circuit is meant to be the input stage for a MM RIAA preamp Looking at the simulation's directive ( trans), why would it show using the 'C' grade yielding half the harmonic distortion compared to using the 'B' grade JFET?
  • The next best thing to 2SK389 2SJ109 ? | diyAudio
    Just as everyone else, I am running down on my reserve of 2SK389 2SJ109s, and am looking for the best possible substitute The LSK389 is only available in N-JFET, and is not pin compatible So for me no solution The most obvious solution is to use still available 2SK170 2SJ74 matched pairs
  • LSK389 Series - diyAudio
    The LSK389 Series, Monolithic Dual N-Channel JFETs were specifically designed to provide users a better performing, less time consuming and cheaper solution for obtaining tighter IDSS matching, and better thermal tracking, than matching individual JFETs
  • Driven Cascode Novelty Circuit - diyAudio
    Fig 2 (New circuit OLG plot) -------------------------------------- NOVELTY DRIVEN CASCODE ------------------------------------ I chose to cascode the input jfets because when the cascode is “Driven with output signal” it does minimize voltage fluctuations between the sources and drains of these JFETS This “constant voltage” approach can effectively reduce higher order harmonic
  • New JFET Hifi Op-Amp release! - diyAudio
    Again, has somebody already compared LSK389 with 2sk389 soundwise? *If* it's reasonably good, a counterpart (LSJ109) is available in V-grade I wouldn't be surprised if we can cope with the 1000-parts-border
  • For Sale - JFETs trimmers - LSK389, 2SK117GR, LSK170A LSJ74.
    Clearing out some spare parts - all parts 100% genuine bought from here or Linear systems, if the prices are off let me know or make offers 6 x LSK389 = £10 EACH all 6 for £50 4 x 2SK117BL matched= £20 all 4 4 x LSK170A unmatched = £28 all 4 4 x LSJ74 unmatched = £28 all 4 all 8 K170 J74 for
  • Mysterious Toshiba 2SK389 SOIC devices found on Ebay. Not LSK389 . . .
    I found some "Toshiba" 2SK389 SOIC packaged dual transistors on Ebay They do NOT have the same pin-out as the Linear Systems LSK389 They are marked K389BL OF I soldered them onto some DIP adapters to test them (I checked the adapters for correct pin translations) The pin-out appears (and





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