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DIY For Audio
2SK117 & 2SA640 Transistors - where to get these? Unobtainable?
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<blockquote data-quote="ludo" data-source="post: 45253" data-attributes="member: 691"><p>They're graded by IDSS. Ie the current that is flowing from D to S with 10V on D and G&S both grounded. This probably relates to VGS and Yfs and RDS etc etc as well. It gets so complicated that it's hard to think of as an exact science ;D Hence the grading to get you in the ballpark. Same schematic. Should work fine.</p><p></p><p>I'll have a look to see if I can find some 2SA640 or 2SA841 originals. I think they might be obsolete now but useful for some repairs. Soundcraft liked those for mic inputs. Otherwise 2SA970 will do. Same pin-out then so no mangling required.</p></blockquote><p></p>
[QUOTE="ludo, post: 45253, member: 691"] They're graded by IDSS. Ie the current that is flowing from D to S with 10V on D and G&S both grounded. This probably relates to VGS and Yfs and RDS etc etc as well. It gets so complicated that it's hard to think of as an exact science ;D Hence the grading to get you in the ballpark. Same schematic. Should work fine. I'll have a look to see if I can find some 2SA640 or 2SA841 originals. I think they might be obsolete now but useful for some repairs. Soundcraft liked those for mic inputs. Otherwise 2SA970 will do. Same pin-out then so no mangling required. [/QUOTE]
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DIY & Tutorials
DIY For Audio
2SK117 & 2SA640 Transistors - where to get these? Unobtainable?
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