2SK117-Y from ebay seller huweihuye

Looking for a particular component or hardware part and you just cannot find it? Got comoonents surplus and want to get rid of it? Post it all here... No sales of working pedals, put these in the 'Seen for sale' section please.
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turbofeedus
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Post by turbofeedus »

https://www.ebay.com/itm/224020730940
https://www.ebay.com/usr/huweihuye

Just thought I'd throw this out there, I rolled the dice on these K117, fully expecting fakes.
I tested half of them (25 out of 50) with a Peak DCA75.

Average Vgs(off) = -0.351V
Average Idss = 1.815mA
Standard deviation Vgs(off) = 0.023V
Standard deviation Idss = 0.262mA

Pinout is a match, and obviously they come up N-channel with swappable drain/source in the DCA75.
I tried a couple in both a SS/BS mini clone and a Duende boost with no noticeable change in circuit self noise vs. SMD J201.

So does this mean they're actually real? Well... maybe. I wish I could actually test for noise.

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soulsonic
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Post by soulsonic »

I find it amusing that the seller is from a region more known for beer than for electronics. :lol:

Wish they had the BL type. I really really miss having those to use. Built some great sounding overdrives with 2SK117-BL.

Knowing they're not fake, I might order some of these. Thanks for the link! I've been curious to try some of the ones I've seen, but after getting burned (almost literally!) on some fake 2SK170 a few years ago, I've been very wary of buying hip discontinued JFETs.
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran

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Post by turbofeedus »

You think there's some other tests I could run? I have a bench power supply that does 30V, I could try that across the base-drain junction and see if it smokes? Supposed to handle 50V: https://www.futurlec.com/Datasheet/Tran ... 2SK117.pdf

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soulsonic
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Post by soulsonic »

I don't remember the exact circuit I was using, but it was some usual thing you would use for testing drain current to find matched sets, because the thing I needed the K170s for needs them to be matched. And as soon as I tried one in the circuit, it burned up. The test voltage wouldn't have been higher than 12v
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran

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soulsonic
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Post by soulsonic »

OK, I'm almost certain it was this circuit: http://www.geofex.com/Article_Folders/f ... tmatch.gif
GEOFEX is still my go-to source for this kind of thing!
:horsey:
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran

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turbofeedus
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Post by turbofeedus »

soulsonic wrote:
23 Jun 2020, 04:12
OK, I'm almost certain it was this circuit: http://www.geofex.com/Article_Folders/f ... tmatch.gif
GEOFEX is still my go-to source for this kind of thing!
:horsey:
I was thinking more tests for checking the K117 for authenticity.

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