Replacement For Toshiba 2SK170/2SJ74


  • 2SK177 GR+BL clone-I.jpg
    2SK177 GR+BL clone-I.jpg
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  • 2SK177 GR+BL clone-data short form.jpg
    2SK177 GR+BL clone-data short form.jpg
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  • 2SK177 GR+BL clone-IV.jpg
    2SK177 GR+BL clone-IV.jpg
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  • 2SK177 GR+BL clone-III.jpg
    2SK177 GR+BL clone-III.jpg
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  • 2SK177 GR+BL clone-II.jpg
    2SK177 GR+BL clone-II.jpg
    233.6 KB · Views: 252
Official Court Jester
Joined 2003
Paid Member
it seems someone is taking 2SK2145 as substitute for 2SK170, using case adapter pcb

treating those 2 JFets in one case as one

from 2SK2145 datasheet .......X is type, G is GR current rank, in this case 2.6-6.5mA

doable and effective, but only if taken care of current ranges (GR, BL, V) and appropriate translation between origin and substitute

so, practically translated to BL range of 2SK170, 6.5 to 12mA
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Is there supposed to be something underneath those two areas that almost look like, I hate to say this, solder blobs (first picture)? I also think this cat could use a little less solder on those pins personally, but that’s just my own opinion and you know what they say about that.