The Danish customs decided to return the package with my 4 x THF-51s before I got the chance to pay the import taxes.....
Ops. This week I got my pair in DK without paying import taxes. Now I am worried for the new quad on its way.
BTW, I am not all the time in DK and this is the first time I have imported anything here.
Attachments
If the Track&Trace says "on hold for Customs" then wait until it says "Customs finished". Then an import tax letter is usually sent (or sometimes it comes by SMS or email). But at this time you can call "Postnord" in my case and ask for the invoice number and a PIN code. Then it is possible to pay online before the physical letter arrives (sometimes it never arrives). If it is UPS then they just deliver the packet and then afterward they sends an invoice for the import tax. So it depends on which carrier.......if Postnord.....it is good to be "proactive"......
I have contacted "Mr. VFET" in Japan and he will keep an eye on the packet that seems to be on the way back to Japan......so hopefully it ends with a happy ending.....
I have contacted "Mr. VFET" in Japan and he will keep an eye on the packet that seems to be on the way back to Japan......so hopefully it ends with a happy ending.....
Thanks for the tip. I actually did not know who to ask about it but did not want to wait until I am back to my primary residence in Sweden... or you guys will buy all available SITs by then. 🙂
Hello Folks,
I Vgs Curve Traced my TOKINs and they aren’t too bad, I didn’t order them matched, Mr. Tomo didn’t even had that option when I ordered them.
Here are the graphics for those that enjoy pictures...
Graphic one shows us Vgs for 6 THF-51S, 4 of them are practically identical across the full measured range, then you have other 2 on the right hand that are far away but hopefully close enough to create a matched pair if needed.
The second graphic shows a closer view of the same THF-51S only from 1280mA to 2000mA.
On the third image we can see 6 of the 2SK182ES, they are not as consistent nor as close as the THF-51S but I hope they’re good enough if some matching would be necessary, in this case 5 are similarly behaved above 2000mA and 1 problem child is far away from the rest.
On the Fourth graphic we can see a closer look of the 2SK182ES from 1200mA to 2000mA of applied current.
Finally on the fifth graphic there’s another closer look of the 2SK182ES but this time at a higher current range from 2000mA to 2800mA which shows that they behave more consistently at higher current.
Cheers!!!
I Vgs Curve Traced my TOKINs and they aren’t too bad, I didn’t order them matched, Mr. Tomo didn’t even had that option when I ordered them.
Here are the graphics for those that enjoy pictures...
Graphic one shows us Vgs for 6 THF-51S, 4 of them are practically identical across the full measured range, then you have other 2 on the right hand that are far away but hopefully close enough to create a matched pair if needed.
The second graphic shows a closer view of the same THF-51S only from 1280mA to 2000mA.
On the third image we can see 6 of the 2SK182ES, they are not as consistent nor as close as the THF-51S but I hope they’re good enough if some matching would be necessary, in this case 5 are similarly behaved above 2000mA and 1 problem child is far away from the rest.
On the Fourth graphic we can see a closer look of the 2SK182ES from 1200mA to 2000mA of applied current.
Finally on the fifth graphic there’s another closer look of the 2SK182ES but this time at a higher current range from 2000mA to 2800mA which shows that they behave more consistently at higher current.
Cheers!!!
I've noticed that the Tokin SITs has a convex surface.
On the quoted comment there is a picture which is a good example, what about I thinking here.
Wondering these are fabricated in this way, as is succeeded, or is it engineered in this way for a good reason.
Perhaps it is helps the heat transfer, if you screwed down SITs to the heatsink with proper torque.
Any thoughts?
Are their serial numbers close? They could be from the same box and their silicon from the same wafer.
All my Tokins are the same. I guess convex bottom ensures that SIT's center(where silicon is) will have good contact with heatsink as edges can't make contact before the centre and prevent heat transfer from there.
Though, I was contemplating should I try to correct that convex surface. 😀
Oh yeah, Mr. Pass has been saying that from the beginning I just have to use the toys 🙂
@ Alex Rivera
Great you have some interesting pairs after measurements🙂
Question: How is possible with not matched transistors build a perfect stereo amp?
I guess is an amplifier topology choice and design who allows use of parts
with some characteristics differences without performance penalty..
Papa knows the good tricks
Great you have some interesting pairs after measurements🙂
Question: How is possible with not matched transistors build a perfect stereo amp?
I guess is an amplifier topology choice and design who allows use of parts
with some characteristics differences without performance penalty..
Papa knows the good tricks
You understood my problem.
That would be the best, if we should know the best solution (torque settings), for each kind of insulators.
I would like to use Mica sets like these for example:
Natural mica sheet insulation sheet transparent mica sheet mica gasket capacitor chip mica sheet 50x50x0.1mm|Cable Winder| - AliExpress
I revised my initial thought, that wouldn't be good if I use enough torque which flattens the surface of SITs.
I'm afraid, it can cause damage to silicon in the case of SITs, or even it peel off from the base, as it flattens.
Any toughts on it?
This one = 4 pcs for big SIT´s Kerafol 86/82 Thermally conductive film 0.25 mm 6.5 W/mK (L x W) 100 mm x 100 mm | Conrad.com