Hockey Puck SIT 2SK180 by Tokin source NOS

[marconi118]

At $1 each in 100 lot.....

Whare can-I order 100pieces for 100$?

Watanabetomoaki is a diyaudio user? or on ebay or whereelse?

 

[Zen Mod]

link in post #159 , then click on "see other items"

yup , ebay

 

[Soundhappy]

just curious - how many SITs you have stashed , and which ones ?

4 curve traced pairs and + THF-51 , 2SK182 ES

 

[plasnu]

4 curve traced pairs and + THF-51 , 2SK182 ES

I measured 182ES from Watanabe-san at various operation points. Very well matched.

LTSPICE based on my measurement. (measured 15-25V range only)

*--------------------------------------------------
*2SK182_Watanabe
*GENERATED BY SIT MODELER @ AUDIOHOBBY.COM
*MODEL RANGE: 30V, 4A
*--------------------------------------------------
.SUBCKT 2SK182_Watanabe D G S ; Drain Gate Source
+ PARAMS: MU=22 X=1 K=0.9 N=0.63 VCT=1.18 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 2500P
CGD G D 5000P
CDS G S 500P
.ENDS 2SK182_Watanabe
*--------------------------------------------------

 

[juanitox]

I have received one pair of 2sk82 from him and it was not well matched , one needs 4,5v and the other 5v to get 1.2amp 🤔

 

[Zen Mod]

if biasing network is able to cover both values , pretty much irrelevant** ; example - in SissySIT circuit - I don't care to have two identical SITs , just need to have them in allowable voltage window

**except in case that they were declared "matched"

 

[Soundhappy]

I measured 182ES from Watanabe-san at various operation points. Very well matched.

LTSPICE based on my measurement. (measured 15-25V range only)

*--------------------------------------------------
*2SK182_Watanabe
*GENERATED BY SIT MODELER @ AUDIOHOBBY.COM
..

Thanks Plasnu for sharing Best regards

 

[maxlorenz]

What would be the interest for custom made ceramic insulators for 2SK180?

I asked a vendor about it and I am waiting for the answer.

What is the "type" of the big encapsulation again?

Cheers,
M.

 

[Soundhappy]

@ Maxlorenz

Conrad have bunch of Kerafol Keratherm products at good prices Suchergebnisse

 

[plasnu]

Soundhappy, you're welcome.

maxlorenz, I was studying the thermal resistance of Tokin SIT.

2SK180 (Pt 300W Tj 150C), θj-c is 0.42C/W ((150-25)/300).
182ES, 0.25C/W.
SONY 2SK82, 1C/W.

It seems the case temp of Tokin can be much higher than regular FET, so the difference of C/W between Keratherm and Ceramic for this size of FET would not be a serious issue, I guess. Have you calculate the difference?

 

[maxlorenz]

Thanks guys.
The German site asks too much as shipping charges that it makes it inconvenient to buy. I bought some similar products online but what worries me is the mechanical resistance especially at the holes' borders. That is why I am looking for these ceramics. The seller has not answered yet. There ceramic plates that may be drilled but there is a health risk involved.

Cheers,
M.

 

[Soundhappy]

There ceramic plates that may be drilled but there is a health risk involved.

Cheers,
M.

Tip : drill and at the same time use vacuum cleaner

 

[plasnu]

And I hope it's not BeO!

 

[maxlorenz]

Tip : drill and at the same time use vacuum cleaner

Good.

Edit:

And I hope it's not BeO!

What´s wrong with BeO?


Thanks.

 

[markgolf]

BeO stands for beryllium oxide I think and beryllium dust is highly toxic
Mark

 

[maxlorenz]

BeO stands for beryllium oxide I think and beryllium dust is highly toxic
Mark

Oh! I thought it was bad for the amp.

Yes, it causes pulmonary Berylliosis, that is why better buy them ready, or use a vacum cleaner.

Thanks,
M.

 

[alexberg]

Are you serious?
BeO is really price prohibitive even in respect to a metallized AlN. The price is unbearable indeed. You may compare price of RF Mosfets with and without BeO.

Dust from Al2O3 or alumina is as dangerous as common road dust. Good luck with drilling.
Anyway there are more than one distributor of alumina pads. But be warned, its brittle and requires proper machining of mating surface.
What's wrong with mica anyhow.

 

[maxlorenz]

Are you serious?
BeO is really price prohibitive even in respect to a metallized AlN. The price is unbearable indeed. You may compare price of RF Mosfets with and without BeO.

Dust from Al2O3 or alumina is as dangerous as common road dust. Good luck with drilling.
Anyway there are more than one distributor of alumina pads. But be warned, its brittle and requires proper machining of mating surface.
What's wrong with mica anyhow.

OK.
Thnx.

 

[Soundhappy]

Good news in a last interview episode with Papa
, thanks to Mr Guttenberg for amazing videos ,
we see not dozen Tokin's but rather dozen of hundreds
+ super exotic golden " small satellites" and mega huge black SIT bricks probably twins in one package.
Think Sony Vfet's Diy amplifiers had been just adventures beginning..

 

[Soundhappy]

300 watt´s 2SK180 rare this days visible on the video was 100 pcs
https://www.ebay.com/sch/watanabeto...Y8MAAOSwnbZYDFkx&rt=nc&_trksid=p2047675.l2562