TzeYang
500+ Head-Fier
- Joined
- Mar 19, 2006
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The 2SK170 is pretty popular these days but their price and availability is making it less attractive.
I'm wondering if there are any good/even better alternatives from vishay siliconix, on semiconductor, fairchild etc (common manufacturers) that I can substitute the 2SK170 with.
I'm using these JFETs mainly for the Input Long Tail Pair of a conventional three stage/two stage discrete amplifier, so anything low noise and decent enough transconductance is appreciated.
I've been contemplating to use PN4393/PN4392 but they have a wide spread of IDSS. FETs usually like being operated near IDSS to sound nice and with the mentioned alternative it seems a bit unpractical. The PN439x also has lesser transconductance albeit being better in terms of Ciss. I figure we degenerate these FETs and the VAS anyway why do we need more gain?
Subjective qualities are welcomed too
I'm wondering if there are any good/even better alternatives from vishay siliconix, on semiconductor, fairchild etc (common manufacturers) that I can substitute the 2SK170 with.
I'm using these JFETs mainly for the Input Long Tail Pair of a conventional three stage/two stage discrete amplifier, so anything low noise and decent enough transconductance is appreciated.
I've been contemplating to use PN4393/PN4392 but they have a wide spread of IDSS. FETs usually like being operated near IDSS to sound nice and with the mentioned alternative it seems a bit unpractical. The PN439x also has lesser transconductance albeit being better in terms of Ciss. I figure we degenerate these FETs and the VAS anyway why do we need more gain?
Subjective qualities are welcomed too