L'Amp: A simple SIT Amp

[woody]

Jama, have you measured many 2sk182 devices? Note I said 2sk182 not 2sk182e ?

 

[dady]

Hi Juan Antonio, always giving good counsels to us.

 

[jama]

Hi Woody. I have four 182es and two 182. Plus two 183 same your photo, broken. None it is useful for one matched pair (matching using full curves, not one point). With thf51 I have been good luck, my friend dady and me have two almost perfectly matched pairs ( I measured 25 pieces, more or less). But if you can get some 2sk180C or D types, then it is probably you can get very good pairs. I think C and D type were selected devices from production and you could build something nice. Look at BAF thread and the version of lamp with two devices in parallel. Now, my actual amp is one lamp with one thf51 and resistor bias. I can get 12wrms at 8ohm, with a sound really wonderful.

 

[cwtim01]

Someone is still selling 2SK180C in the swap meet session (not sure if they're matched though):

http://www.diyaudio.com/forums/swap-meet/283642-fs-tokin-sit-2sk180-2sk180c-tokin-2sk-180-d.html

But it remains to be seen what VFET Michael will be using 🙄

 

[Soundhappy]

Maybe something like this...

Some old rust Tokins on Frankentracer or Locky_Z can show better parameters if compare with bad batch of new old stock shine ones 🙂

But it remains to be seen what VFET Michael will be using 🙄

@ Cwtim01

Yes that the question

@ Diyers Fantastic Vfet aficionados are interested by V-Fetron 😀
Hope diy friend WalterW come back join us in short time

Who have tested this JT-123-SLPC
600 ohm quadrifilar Jensen transformer ?
Line Output Transformers | Jensen Transformers
Distortion level are lower and gain is + 24 dB ??

Have a nice day 🙂

 

[Dennis Hui]

No go for the real big 1000 watt ones .... These puppies would be harder to use as they need to be sandwiched between 2 heatsinks with a lot of contact force. Now finding a source for these may be a little hard ...

Holy cow! Didn't know such a funky part existed. They look like tiny
flying saucers. 🙂 How large are they?

Cheers,
Dennis

 

[Junm]

Some old rust Tokins on Frankentracer or Locky_Z can show better parameters if compare with bad batch of new old stock shine ones 🙂

I just happened to find this rusty things on a surplus box. these are pulls from and old hospital equip't as per seller..he gave me 11pcs of it at 3usd each and upon initial test they are still working...just don't test for matching.

Just cleaned them and now looks better...

 

[hifibluedevil]

some vfet amp designs, SE and push-pull.

I was searching for data sheets of certain vfets and found this place; have some interesting applications including a SE amp with 2SJ28. I am not sure if it was mentioned here before, if so please accept my apologies.

AMPLIMOS one stage amplifiers, amplificatori audio monostadio

 

[Soundhappy]

I just happened to find this rusty things on a surplus box. these are pulls from and old hospital equip't as per seller..he gave me 11pcs of it at 3usd each and upon initial test they are still working...just don't test for matching.

Just cleaned them and now looks better...

Recycled from old equipement yeah was used in many machines.
3 $ pcs 😀 great you put them in class A amplifier circuit and new life start they run warm again.
Good luck for find nice pairs.

Michael write us 75 watt use 2SK180.
http://www.audiohobby.com/
I belive they can probably work with 2SK182 after some circuit modification ?

Maxonic build high-fidelity amplifiers with 2SK182

New V-Fetron thread ?
Kind regards

 

[DIYBras]

Holy cow! Didn't know such a funky part existed. They look like tiny
flying saucers. 🙂 How large are they?

Cheers,
Dennis

Japanese guys, obviously from SIT Land, played with them time ago:
‚’ep
But with different concept (ahhhh, too many transistors 😛 ).
Note how they are assembled into a heat sink down the page, and note the first illustration 😀🙂 (flying saucer like)

 

[woody]

Here is a PDF about these.


2SK180 Yoshino International, 2SK180 Datasheet


Even there data sheet is a little confusing keep in mind the 2sk182 is the round hocky puck shaped 1000w device and the 2sk182e is in the other flange type case like a to3 and is rated at 500W . By the way if you look at this pdf they even had some huge 3000 W devices !!!!

http://pdf.datasheetarchive.com/indexerfiles/Scans-066/DSA2IH00199222.pdf


Now if I only had a couple of matched quads of those 3000W devices ......

 

[mikegranger]

Japanese guys, obviously from SIT Land, played with them time ago:
‚’ep
But with different concept (ahhhh, too many transistors 😛 ).
Note how they are assembled into a heat sink down the page, and note the first illustration 😀🙂 (flying saucer like)

Hello all,

I worked with SCR's and diodes in this package ages ago. They require special mounting and heat sink hardware, and are picky about proper clamp pressure for reliability. If you could get the heat sinks they were mounted on that would be ideal. Very cool devices and interesting (to me) topologies! Thank you for sharing with the group.
Someone asked how big they are-- if memory serves me they are about 1/2 inch thick and about two inches in diameter.

 

[woody]

The 1000 watt package is 55 mm in diameter and the 3000 watt device is 76 mm in diameter. I am not sure if the 3000 watt device was actually available as a few of these
SITS listed in the Token data sheets were just proposed new devices and never produced other than as early samples.


Now to practical maters. If I just wanted an inductor loaded amp to just cover above 400hz would I be able to use a small inductor say around 3mh instead of that 110 mh one Michael Rothacher used in his amp ? Wouldn't a 3mh inductor give a 6 db per octive crossover point at ~400 hz for an 8 ohm speaker if the impedence curve was rather flat.

 

[Soundhappy]

Here is a PDF about these.


2SK180 Yoshino International, 2SK180 Datasheet


Even there data sheet is a little confusing keep in mind the 2sk182 is the round hocky puck shaped 1000w device and the 2sk182e is in the other flange type case like a to3 and is rated at 500W . By the way if you look at this pdf they even had some huge 3000 W devices !!!!

http://pdf.datasheetarchive.com/indexerfiles/Scans-066/DSA2IH00199222.pdf
Now if I only had a couple of matched quads of those 3000W devices ......

Thanks for remembering yes i was thinking about 2SK182 ES not biger hockey puck's 2SK182 😉
Imagine such 1000 watt sit in L'Amp with 500 watts light bulb 😀 go Steampunk

 

[WalterW]

Yes, thanks woody! Interesting pdf with all the applications mentioned.
It's technology from 1989 😀

 

[Dennis Hui]

Woody, thanks for the cool info. The 3000W device is really the size of
a hockey puck. That would have been a sight to behold.

Cheers,
Dennis

 

[dantwomey]

Hello all,

I worked with SCR's and diodes in this package ages ago. They require special mounting and heat sink hardware, and are picky about proper clamp pressure for reliability. If you could get the heat sinks they were mounted on that would be ideal. Very cool devices and interesting (to me) topologies! Thank you for sharing with the group.
Someone asked how big they are-- if memory serves me they are about 1/2 inch thick and about two inches in diameter.

I still work with these on an industrial level from time to time. If I could find one of the SIT hockey pucks it would be fun to tinker with it.

Regards,
Dan

 

[woody]

The 1000 watt package is 55m in diameter and the 3000 watt package is 76 mm in diameter .

 

[Soundhappy]

I still work with these on an industrial level from time to time.
If I could find one of the SIT hockey pucks it would be fun to tinker with it.

Regards,
Dan

Absolutly 😀

 

[Dennis Hui]

Pin extension

Hi,

I pulled the attached TO-3 part from a thick salvaged heatsink and
noticed there appears to be extension pins. I want to use the
same on a 2sk82. Would anyone know where I can get these
extension pins?

Thanks,
Dennis