Hockey Puck SIT 2SK180 by Tokin source NOS

[Soundhappy]

Verified genuine Tokin SIT's source Watanabetomoaki | eBay
for the moment cheaper price than the other sellers
and roughly matched and curves traces matched are possible

 

[triode_al]

Thanks for the link. I got mine today. Well matched.
I use the 2SK182_Watanabe model provided here, but does anyone have a 2SK180_Watanabe spice model?

 

[triode_al]

Talking about the 2SK180 is probably seen as off-topic
So I asked elsewhere.

 

[Soundhappy]

@ Triode_al

Interesting topic about LTSpice models creations Concise SIT Model From Linear Audio Vol. 6 Now Freely Available

Best regards

 

[Soundhappy]

Bump for verified genuine Tokin SIT's source Watanabetomoaki | eBay

 

[soundslave]

I know this has been asked before but is there a order of preference regarding these Tokin devices? Are they all still available?

 

[Soundhappy]

@ Soundslave

Read this message by Mr.Pass While they last...
No single winner but all are great players Best regards

 

[Soundhappy]

Watanabetomoaki | eBay

Prices was incrased by Watanabetomoaki
ask him if you can get transistor mounting kit:
with thermal pad , isolation bushings and screws, nuts, washers..

 

[Soundhappy]

Watanabetomoaki shop doesn't show any SIT´s today

Well good news we still have Pras1170 and some new sellers https://www.ebay.com/sch/i.html?too...OSwnbZYDFkx&_from=R40&_sacat=0&_nkw=Tokin+SIT

 

[Soundhappy]

Better avoid this strange ones or at your own risk

2SK182ES Tokin Original Transistor TO3 | eBay

1PC THF-51S transistor | eBay

 

[triode_al]

Also better avoid these too


tested as SIT: does not work. gate pin does not allow lowering nor raising the bias.
So:
Tested as an NPN transistor: does not work. (no conduction above 0,6V 'Vbe')
Tested as mosfet: does not work (no threshold above 4 V Vgs)

• The connection I made was big pin as source; house as collector via 15 ohm to + 25V; small pin as base connected to a potmeter 25K connected to plus minus 12V, over a 4k resistor to the small pin.
  Whatever the position of the slider, Only a voltage of about (between -1 V to plus 1V is left). The small pin sinks all input current.
• That is, with or without Power Supply +25V connected
• No current through the 'collector' pin.
• With my real Tokins I can set the gate pin to -10 or -15V, VGS, without gate current. Then I can bring up the 25V power line, and turn the slider untill it conducts. With real mosfets, they start to conduct above 3,5 volt or so in this setting.

Might it be a relabelled thyristor marked as TOKIN THF? Do they think we are dumb? .
we are, in buying these.

• Am I right that the connections of the THF are like the 2SK182?

 

[Zen Mod]

yup

body dran, big pin source

 

[Nelson Pass]

Perhaps it is simply broken?

 

[triode_al]

Not two broken at the same time . . with the same "behaviour"

I did the test that is written by Sony for the VFET amplifier replacement procedure:

• Norm: Rds and Rsd should for the 2SK60 be around 1-3 ohm ohm.
• I measure Rds/Rsd one 0,35 the other 0,46 ohm on my old 2SK182.
• My 2SK180 gives 1,53 ohms reading both ways.
• -->the THF give none resistance. Infinity. Both.
• Norm: Rgs and Rgd upwards ords of 30 kohm in 2SK60
• I measure Rgs/Rgd at 10K in 2SK180, similar 2SK182
• -->the THF gives 560 ohms resistance. Both.

So. Both these "THF51" give . . . no low Rds/Rsd resistance at 200 ohm range , but using the junction voltage test I get a result.
And no current flows with 25V over the unit and the 'gate' connected to a variable input +/- 12 V; whatever I choose.

It is not that the pins have been the victim of some babeltalk. It just makes no sense.

 

[tombo56]

Problem is that those THF-51, pulled from the decommissioned equipment, were subjected to electroplating “beauty treatment”, During procedure, as all pins were exposed to electroplating voltage, semiconductor is simply burned.

I received two similar last year and they were burned, each one in a different way.

 

[V FETish]

Also, these were mass produced for several years so it's not unlikely to find some fallout devices for sale as stocks dwindle.

 

[triode_al]

Problem is that those THF-51, pulled from the decommissioned equipment, were subjected to electroplating “beauty treatment”, During procedure, as all pins were exposed to electroplating voltage, semiconductor is simply burned.

I received two similar last year and they were burned, each one in a different way.

What happened, how did the seller respond?

Burned . . . That makes 'while they last' a real problem.

 

[tombo56]

It was a different seller on AliExpress, but those frauds use the same methods and likely the same source for parts.

Seller was playing dumb, so it was easier to press on AliExpress. They didn’t yield easily, but I got a refund.

 

[triode_al]

Did they accept a full refund incl. parcel/postage?

 

[tombo56]

Yes, they did. It helped that picture of advertised THF-51 was of original part and I received freshly electroplated parts with different lettering.

However, on parts you received, there is a new method. Original designation letters were preserved during electroplating. Original dull silver-gray surface is there. So, this was an original THF-51S. Clumsy electroplating procedure killed the chip.