Matched JFETs

I bought "Toshiba 2SK170/2SJ74 Octet IDSS 6-8mA" and used them to building up my latest Dead Bug Power Amplifier, 80 ~ 100(W) continuous rated power. (Dead Bug means Flying Wired without PCB artworks)

The FETs are so exactly matched that there is no struggle to adjust DC bias. At next chance, I will also use these FETs. Here after I attached several photos of my last project.

I'm very happy with my purchase . I have used them in my new Hiraga Les Monstre and the overall sound is amazing

I've just built B1 around those. Haven't auditioned it yet, but the oscilloscope says it's basically perfect 10Hz-500kHz. I'm very happy so far, I'll probably come back for more.
Cheers!

I have ordered these original Toshiba 2SK170/2SJ74 - JFets (BL-range) a few weeks ago.
Today I measured them with great results - they are matched very, very well!
Delivery was fast. They have been packed extremely well! Thanks a lot to the diyAudio-store!
On the pics some measurements - you know with different temperatures and test-equipment
you can get different values - very good matching job!
Cheers
Dirk

Many thanks to Elena and diyaudio for sorting out customs issue. Excellent service.
Where would I be without these jfets?
Currently underway with BA1/2 pre with 610/9610 headphone buffer nailed on, 27V rails, 2.4R degeneration, 450/550 regulation from Waynes Pearl 1 circuit. Balanced xlr input only from my balanced DAC, 4 gang tkd pot. Nearly done, just got to connect boards, psu, pot etc. I can alter source resistors, load resistance and may try extending feedback loop to buffer output.
Also F5 in a galaxy box (!), 500VA, 4 x 47000 caps, 37V rails, cascoded jfets, 240/9140 mosfets just to be different, soft start, yet to fit heatsinks and audio boards, should probably renew my eyebrow insurance before I switch this one on.
Pearl 1 MC phono stage using three LSK170 quads.
BA3 pre, mje 15034/5 cascoded jfets, 35v rails, 510/9510 mosfets, biassed to over 300mA, multiple source and load resistors for adjustment, TL431 psu regulation for easy adjustment of supply voltages.
But can you tell which one is which?

The transistors are original; I'm very satisfied.

The value of having exactly what you need, cannot be overstated. Buy an extra set if you want to fool proof your experience. I can say I’ve been a fool a few times and it only takes once to stop a build dead in its tracks 🙂

The jfet's are very well matched and given the fact that you build a special type of amplifier they are a must, not to mention that they have one of the lowest noise out there. Basically there are no other transistors like these and probably it will never be, so thank you for the wonderful opportinity to build the symmetrical amplifier with super low thd and completely dc, the dream of every audio enthusiast, somethink like the holy grail of audio amplification.

It was definitely good to find this specialty parts service. It allowed me to be able to repair a very special power amplifier, by offering the perfect and match solution to a part, that I did not trust at other known sources.

GREAT PRICE, QUALITY PARTS, ALWAYS A POSITIVE EXPERIENCE ORDERING THROUGH THE DIY AUDIO STORE AND COULDN'T BE HAPPIER WITH THE FAST SHIPPING SERVICE. THANK YOU !!!!

Very good match, very good product,

Genuine 2SK74 jfets are getting harder to find, let alone having enough of them to match properly with the 2SK170 complement. DIY Audio Store to the rescue! The 8 I bought are superbly well matched to each other and complement the 2SK170s I already have very well. Finally, the low distortion complementary jfet MC headamp is a reality.

These Fets are the best I ever tested and heared in my MC Preamp. They are very well matched and they give the highest amplification with the lowest Noise. Thanks for fast delivery to Germany.

Received the matched jfets fast. Have not used them in a personal project yet. But glad to be able to get jfets again. I prefer solid state for its reliability vs tube. I look forward to building a turn table record player with moving coil pre pre amp for my line level preamp instead of a Step Up Transformer (SUT) All battery to avoid AC hum etc...

as described

Jfets installed on board

Perfect matched, they manage to deliver true analog sound, just as I expected.

Thanks to DIYA for teaming up with NP (pretty sure!) to make available the 2SJ74 matched FETs. The listing says matched, but I didn't expect to see just how well matched they were. On my curve tracer, the quad was out by less 150uA ! What's not to like about that for the price! Get them while they're still available!

Hi

I bought an LSK170 quad for a Mezmerize B1 and it's perfect, the sound reproduction is above my expectations.

Cordially
Frederic

I used jfet to build buffer B1, excellent result.

Arrived quickly and as described. Very enjoyable experience.

I am using these JFET's in a set of Folded Cascode CEN IV boards. They have worked perfectly.

I tested them on a couple of testers I have and each quad set match exactly. Haven't had time to complete the first project yet, but soon.

These LSK170 were intended to replace 2SK170 for the realization of a RIAA PACIFIC preamp. The result is excellent.

The Jfets perform great and are well matched. Delivery from the DIY Audio Store is prompt as well.

Purchase was easy and shipping fast. Thank you! Could not yet use the JFETs and hopefully will get the Mosfets for the ACA mini too;)

The new ACAmp is working well sound is nice with Denon 9600 headphone

Pictures will follow later