B1 Buffer Preamp - FET choice?

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A

AndrewT

R.I.P.
Joined 2004
Hi,
the LSK389b will work well in a B1.

The 389 is a pair of thermally coupled k170 in a single seven legged package. The tolerance in the spec is 0.9:1 i.e. a spread of <=11%. In practice they are likely to be much closer and good enough for a B1.
You will need to measure the Idss of both halves to find which is the higher Idss device in the package and then decide which of these is adopted as the upper device and which the CCS.

How much to a buy a pair of LSK389b?

A 1000 LSK389 will cost >$2000
 
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A

androidDIY

Member
Joined 2009
AndrewT said:
Hi,
the LSK389b will work well in a B1.

The 389 is a pair of thermally coupled k170 in a single seven legged package. The tolerance in the spec is 0.9:1 i.e. a spread of <=11%. In practice they are likely to be much closer and good enough for a B1.
You will need to measure the Idss of both halves to find which is the higher Idss device in the package and then decide which of these is adopted as the upper device and which the CCS.

How much to a buy a pair of LSK389b?

A 1000 LSK389 will cost >$2000
Click to expand...

Great!I am waiting of the quotation of LSK389B,but this means that I need to layout the PCB by myself.
 
E

early

Member
Joined 2008
If it helps any I've used a couple of different fet's in mine .

J310's which sounded very punchy , they also worked very nicely off a 12v battery .

2SK369's which I've settled on , not quite as dynamic as the J310's but much more refined sounding , they are far more neutral than the 310's which are probably injecting a bit of their own character .
 
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