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Old 16th February 2008, 04:08 PM   #1
burbeck is offline burbeck  United Kingdom
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Default 2sk150

hi all,
has anyone got data sheet for this dual jfet?
pin out details at least

anyone sucessfuly substituted 2 jfet in place of one?
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Old 16th February 2008, 06:06 PM   #2
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Here you go, the DGS#SGD pinout is standard for this package type.

VDS=-50V, 2*0.2W,gm=12 mS typ.
Idss: Y=1-3,GR=2.6-6.5,BL=6-14mA.
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Old 16th February 2008, 11:47 PM   #3
burbeck is offline burbeck  United Kingdom
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thanks jacco
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Old 17th February 2008, 12:42 AM   #4
tvi is offline tvi  Australia
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Its in Japanese, hope it helps.

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James
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Old 17th February 2008, 08:35 PM   #5
burbeck is offline burbeck  United Kingdom
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thanks James

any one succesfuly substituted 2 jfets for this dual?

matching might be the main thing to consider.
it is used on power amp input diff any advice?
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Old 11th March 2008, 09:32 PM   #6
satoru is offline satoru  United States
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Quote:
Originally posted by burbeck
thanks James

any one succesfuly substituted 2 jfets for this dual?

matching might be the main thing to consider.
it is used on power amp input diff any advice?
2SK150 is a single chip JFET and has transconductance of ~8mS@1mA, ~12mS@2mA while maintaining low noise. Something comes close to this is two matched 2SK117 pasted together (of course, the drift would be worse). Toshiba lists 2SK389 as a substitute for 2SK150 but 2SK389 has higher transconductance so the frequency response would be different. Pasting together two matching 2SK170 is a good substitute for 2SK389 electronically (except for the drift). uPA63 or uPA68 are good substitute but I don't know where one can get them. Good luck!

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Old 11th March 2008, 10:22 PM   #7
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.
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Old 11th March 2008, 11:40 PM   #8
burbeck is offline burbeck  United Kingdom
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hi satoru,
thanks for the information, very useful

jacco nice pic
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Old 12th March 2008, 10:55 AM   #9
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Why not just order a 2SK150 for $6 from Mark5 ?

(more affordable than for those in need of a Mitsu/Pana 2SK109 dually)
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Old 12th March 2008, 11:31 AM   #10
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Just kidding, the K150 is less than $3 each at places like Grandata if you're not in the mood to fill Mark's pockets.
Some US stores list the SK150 as low as 1 dollar 50.(some folks don't get my cynicism)

Interesting amp, never seen a schematic with a K150 on the input, only as cascode devices for higher octane dual JFETs.
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