Pars
Can Jam '10 Organizer
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- Oct 28, 2003
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You won't be able to find the dual BJTs either (2SC3381 / 2SA1349 IIRC). Use matched pairs of singles such as 2SC2240 / 2SA970 or others; no big deal.
The dual JFETs (2SK389 / 2SJ109) weren't always matched that great (I think according to the datasheet they were only guaranteed to be within 10% or posibly higher matching). I know I have one that isn't matched particularly well. You should be able to match the singles much closer. Also, on diyaudio, there was a group buy for some "heatsinks" intended for singles such as these replacing the duals. These don't run hot, but the "heatsink" thermally bonds the pair together. Apparently they work quite well.
The dual JFETs (2SK389 / 2SJ109) weren't always matched that great (I think according to the datasheet they were only guaranteed to be within 10% or posibly higher matching). I know I have one that isn't matched particularly well. You should be able to match the singles much closer. Also, on diyaudio, there was a group buy for some "heatsinks" intended for singles such as these replacing the duals. These don't run hot, but the "heatsink" thermally bonds the pair together. Apparently they work quite well.