Just a thought; maybe one can make a quasi-complementary 2SK82 by compounding 2SJ28 with a low power NPN or FET. The FET may preferably be a low power N-VFET to take full advantage of the triode-like properties of the resultant quasi. Mr. Go of circuitdiy recently reported that he has a large supply of 2SJ28. I recently bought 6 units.
True of all parts comparing Common Drain and Common Source.
VFET in Common Drain is still different than Mosfet for example.
That was a knee jerk reaction,boosted by the fact that a known counterfeiter on the bay has used a similar image for his listing.
A member on another site who says-
Plus,they have been through a curve tracer and are reported good.Also reported good testing with a multimeter for D-S resistance and diode tests.
A simple google and forums search search usually throws up all you need to know
atleast most of the time.
I believe you're referring to the 2SK82s that I sent you. Good to hear that the multi-meter test results are positive
I don't remember which exact 2SK82s I sent you, but if their marking is JF33 the hand-written number on them must be between 1-4. I happen to have kept their curve data, so here it is for your reference.
Attachments
I believe you're referring to the 2SK82s that I sent you. Good to hear that the multi-meter test results are positive
I don't remember which exact 2SK82s I sent you, but if their marking is JF33 the hand-written number on them must be between 1-4. I happen to have kept their curve data, so here it is for your reference.
They look a lot like the ones I have, assuming similar axis scales.
I haven't run across any samples that didn't work fine, and if paralleling
parts I think you can just use Vgs matching and be happy.
As above, if they are of the generic type, just go by the Vgs measure. If you
try to deal with all the other possibilities within a given part, you're going to
end up over-thinking it.
Thanks Mr. Pass, definitely agree. As I sold the parts to another forum member, I just wanted to show him that the parts are good.
I am building Michael's LuminAria lately, and I realized that matching curves doesn't necessarily give what I want in circuit, measuring the devices in the actual circuit are far more useful.
Dear Mr Pass, thank you very much for your time.
Is true like you said, I over think.
But now, that you actually answer me, further I feeling lucky, probably I not make a clearly the question, idiomatic problems are the first problems for me, but they are not caming to the case.
My specifically question is about the envelope of the cathode follower or the source follower on the Vfet system. We adopt the vfet traces for the y=x3/2 character curve that give us the gently round clipping. Does the same envelope is make in the followers ?
Is true like you said, I over think.
But now, that you actually answer me, further I feeling lucky, probably I not make a clearly the question, idiomatic problems are the first problems for me, but they are not caming to the case.
My specifically question is about the envelope of the cathode follower or the source follower on the Vfet system. We adopt the vfet traces for the y=x3/2 character curve that give us the gently round clipping. Does the same envelope is make in the followers ?
JA-33
To be sure I didn't refer a bad source to this forum, I ordered 2 pairs of VFET from the shop that I mentioned in post #76, I received them today and they're having markings of JA-33.
I measured them and they look genuine to me (curve of one sample attached), though the required bias level maybe slightly different with the KE-33s.
To be sure I didn't refer a bad source to this forum, I ordered 2 pairs of VFET from the shop that I mentioned in post #76, I received them today and they're having markings of JA-33.
I measured them and they look genuine to me (curve of one sample attached), though the required bias level maybe slightly different with the KE-33s.
Attachments
I believe you're referring to the 2SK82s that I sent you. Good to hear that the multi-meter test results are positive
I don't remember which exact 2SK82s I sent you, but if their marking is JF33 the hand-written number on them must be between 1-4. I happen to have kept their curve data, so here it is for your reference.
Yes indeed.The can marked 1.
I didnt want to take your name as I was doing the classic newbie first forum post-crying wolf without doing my research(despite the assurance given by you).
More like,I was thinking on the lines of J and K being like different HFE grades on BJTs,so I would have a issue getting proper setup.Now,since its just the production code,with the grade 33 being same,I think there is no such issue,I hope.
My sincere apologies!
Another member has identified Aliexpress as a source before (Aliexpress.com : Buy SONY 2SK82 V FET from Reliable fet transistors suppliers on Eternal HONG's store | Alibaba Group), and they seem to have almost a thousand pieces of JA-33 2SK82 available.
Aliexpress do not deliver to Hong Kong (they sell stuffs from TB to foreign countries, at a somewhat higher price), so I can't try them, but brave souls in Europe or US may order one and see if they're authentic.
Aliexpress do not deliver to Hong Kong (they sell stuffs from TB to foreign countries, at a somewhat higher price), so I can't try them, but brave souls in Europe or US may order one and see if they're authentic.
I have noticed that genuine Sony parts in general have the markings oriented along the long axis of the part and they are flat (smooth) on the bottom. The fake Sony parts I've gotten from various places, have the text oriented along the short axis and they have circles and other markings on the bottom of the part (because they are re-marked samples of whatever was lying around ) Just FYI, for what it may be worth.
) Just FYI, for what it may be worth.
... My sincere apologies!
No apology is needed
, it's normal for a buyer to doubt the authenticity of these expensive and obsolete parts. Every time I bought a Tokin, first thing I did is to check if they're fake/bad, and asked for refund if so.This is exactly the reason I'm afraid to run a group buy, despite it could benefit many forum members, and it's still not very difficult to get these parts in quantity in China.
Thank you for taking the chance and letting us know. Other members
can decide based on your experience whether it's something they
feel comfortable pursuing.
Cheers,
Dennis
I have noticed that genuine Sony parts in general have the markings oriented along the long axis of the part and they are flat (smooth) on the bottom. The fake Sony parts I've gotten from various places, have the text oriented along the short axis and they have circles and other markings on the bottom of the part (because they are re-marked samples of whatever was lying around
I should make a correction to that comment:
The real Sony's have a ring around the bottom, the fake parts are flat or have a shape like the one shown in the photo.
In both pictures, the real part is on the right.
