Live Lab Hangout #1.1 Posted

[Michael Rothacher]

Sure, you send 'em, I'll trace 'em.




I know what you mean. Some of these parts look like they were sunk on a barge somewhere.

 

[Soundhappy]

2SK182 ES Tokin in test 20 V / 2A
The same sit numbers order on photos only voltage change.
Greetings

 

[Soundhappy]

border="1"
|-
| class="tcat"| #
| class="tcat"| SIT 182 ES
batch nr
| class="tcat"| 12 V
| class="tcat"| max 2A
| class="tcat"| 20 V
| class="tcat"| max 2A
|-
||1||1Z2670 || 2,51 || 0,308 || 3,00|| 0,367
|-
||2||1Z2671 || 2,34 || 0,286 || 2,77 || 0,338
|-
||3||1Z2672|| 2,26 || 0,276|| 2,69|| 0,329
|-
||4||1Z2673 || 2,42 || 0,296 || 2,87 || 0,351
|-
||5||1Z2674 || 3,18 || 0,389|| 3,97|| 0,486

 

[cwtim01]

... I've got a few of them on the way from Japan ...

Could you share the link on where to get those from Japan.

Thanks and regards.

 

[Soundhappy]

Does anyone have any "known good" 2SK182ES, or curves for them?
I'm thinking the two that I have are bad. Even the high voltage curves are just way out of whack.

I think they should look a lot more like the 2SK180.

I've seen a "bad" 2SK180 that has that same whacked-out character, so I'm wondering...

Hi again Michael and Diyers

Maybe we can ask gently via email Maxonic or Sibatech team people some more 182ES informations ?
Personaly i am to newbie for speak with him about datasheet and curves
could experienced ask in the name of DiyAudio sit's aficionados please ?
Maxonic email : ktinter@nifty.com
Other ways ?
SIT Amps from Japan - Mockingbird Distribution LLC

Anyway this is e-mail i have received from Sibatech .Inc

" Many thanks for your inquiry on Maxonic/ SIT to our website.

Although "2SK77B" is not available from Maxonic, "2SK-182ES" SIT is
possible instead by \19,500/piece (Plus shipping cost) (Left side round
shaped device on attached photo)

Thank you very much again for your kind attention in advance and we look
forward to your kind response, soon.

Yours Sincerely
Hiroshi Ishihara

Director
Sibatech,Inc.
No.1301,8-25-22
Higashisuna, Koto-ku,Tokyo
Japan 136-0074
TEL:813-3645-1646
FAX:813-3645-1948
E-mail: <hishihara@sibatech.co.jp>
URL:Sibatech, inc. High-quality Audio Equipment from Japan "

-----------------------------------------------------------------------

Have a nice day

 

[Michael Rothacher]

Good work, Christophe

Finger in the wind says that's looking good for you

Making lots of assumptions, that's mu average = 3.5 ish

Can you take another set of readings at the 30V (or whatever the high range of your bench supply is)?

Also, do you measure a little voltage across the 1k resistor?

 

[Soundhappy]

Yes Michael
i can do this night with 30 V /2A & mesure 1k too.
Stay in tune
Christophe

 

[Michael Rothacher]

I recall you said you have a 1 ohm power resistor in your junk box.

Here' something else you can try while you're having fun.

 

[PSz.]

Could you share the link on where to get those from Japan.

I wish there was a link I could point you toward. I had to purchase 20 of them at auction through an intermediary. They have not arrived yet, but I am led to believe that they are unused, new in box with sequential serial numbers etc.
As far as I can tell the seller doesn't have more.

 

[generg]

I'm sorry for my bad pronunciation of your name. I will endeavor to sound more german next time.

After all, I'm a Rothacher.

It was not bad, it was funny and I liked it very much, it put a bit American flavour on my person......

Thank you!

 

[PSz.]

Sure, you send 'em, I'll trace 'em.

The 182s are on the way. Tracking says they should be there Monday.

 

[Michael Rothacher]

Great, thank you. BTW, there's a complete set of curves for the 2SK180 on my website. I've had maybe a dozen and most of them look like that, with a couple outliers, one that was just plain bad.

 

[generg]

I made a Spice model out of your 2SK180 curves with your modeler some months ago….

But I suppose you did it already Mike….

*2SK180
*GENERATED BY SIT MODELER @ AUDIOHOBBY.COM
*MODEL RANGE: 100V, 2A
*--------------------------------------------------
.SUBCKT 2SK180 D G S ; Drain Gate Source
+ PARAMS: MU=16 X=1.8 K=0.225 N=1.72 VCT=0 RG=2MEG
*--------------------------------------------------

B1 D S I=K*PWR(URAMP((V(G,S)+VCT)+(N*LN(V(D,S))+(V(D,S)/MU))),X)

*FOR MULTISIM COMMENT OUT ABOVE LINE (*) AND UNCOMMENT NEXT LINE

*B1 D S I=K*PWR(MAX((V(G,S)+VCT)+(N*LN(V(D,S))+(V(D,S)/MU)),0),X)
R1 G S {RG}
CGS G S 1500P
CGD G D 0P
CDS G S 0P
.ENDS 2SK180
*--------------------------------------------------

 

[Michael Rothacher]

You did very well, quite close to the values in the video. You might also want to try the values Excel found just for fun (towards the end of the video).

https://www.youtube.com/watch?v=mWTyHNhG2N4

 

[generg]

My god, how could I forget so fast most of the content of your first lab hangout.....!

 

[Soundhappy]

I recall you said you have a 1 ohm power resistor in your junk box.

Here' something else you can try while you're having fun.

Thanks Michael for schematics
I am busy for personal reasons but i try make new mesurements
if i find free time , hope tomorrow. Sorry for the delay.
Best regards

 

[Michael Rothacher]

Take your time. There's no rush here. This is supposed to be fun

 

[Michael Rothacher]

No lab hangout this weekend, but here's a little something:

L'Amp 2SK180 Video

You can check out my cinematography skillz :wink:

 

[cochleus]

Thanks, I liked it, but I'm "biased"

 

[ui2]

Hanging out

I very much appreciated lab hangout #3 because I learned quite something about feedback.
This one now is more to celebrate a 2SK180 amp-design success! Great!

By the way, what music is it?
Ulrich