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This may be possible....BUT, STK's were designed with overload protection, thermal shutdown and bootstrap features. Akai designed circuits around available semiconductor devices at the time. This is a dire straits situation if no STK's are available then yes. Sound characteristics may differ since transistor hfe are not exactly the same. Unless STK specify equivalent transistor circuits.

Quite similar to the work I had been doing when it came to solid state amplifier repair except the STKs were available (1972 to around 2000). I got so experienced with transistor amps that I even made some from scratch in the late 1970s early 1980s. They still work now, trouble free.

¡Genial! me dio esperanzas, tengo el mismo ampli, pero nadie en Argentina tiene los repuestos de esos integrados, no me resignaba a deshacerme de el, y ahora menos que menos! gracias por este tutorial

Very good idea regarding the prices of hybrid obsolet units ! many thanks !

Esto si funciona!? Es el mejor puto vídeo eso se necesita para reemplazar estas guevonadsss ome felicitaciones

Baru tau kalau stk bisa di ganti PNP & npn sangat luar biasa👍👍👍

Nice video, thank you

Foi de maravilhosa ajuda essa dica q vc me deu obrigado 👏👏👏👏👏

yes you can, but dont forget the driver transistor inside (stk) you need to check it for biasing. ;P

EXELENTE EXPLICACION MUCHAS GRACIAS.-

GRACIAS por publicar el circuito completo del STK 0050. tendras el circuito completo del STK 0029, tengo un technics SA-202 con un canal quemado. muchas gracias por tu generosidad.

Saludos y excelente su vídeo tengo un amplificador Sanyo y tiene un stk 4182 || y quisiera adaptarlo a Transistor pero no el equivalente a ese espero de usted esa ayuda gracias

Wahoo amplifier identical to mine! Interestingly, I always thought it had integrated circuit amplifiers

Nice work! Saludos

Great ! We had exactly the same in 80's. This is typically the death reason of this amplifier.

Thanks for your concern You've done well but you move fast

не так давно ремонтировал усилитель TRIO-7500. там тоже была сгоревшаю микросхема(микросборка) TA-100 (типа STK). Цена на нее очень высокая, порядка 200$ Пришлось проектировать и травить плату взамен этой микросборки.

It would have been nice if you could have focused on the npn that's would be able to tell which one you were using but obviously you were going too fast and if you really didn't consider that other people might want to know

Hi! great job! You can help me with the SVI4004 on Technics amplifier? What can I put instead? and some schematic working. Please help me! 😔

Muy bien, I Love, Gostei Muito

Замена на 2 мощных транзистора разной проводимости в одном корпусе! Правда тяжело выпаивать 10 ножек без отсоса?

Norman gates ...absolutely right. I have try and done but no succeed It's impossible cause final TR need bias regulator and driver...

Excuse me sir you cannot replace darlington, to a single transistor just like that.. What about your drive and biassing circuit.?

awesome video keep it up dude...

Hello my friend, you are brilliant at this work. Thank you for this information. It was very useful to him Item 0040 It has been unemployed for a long time, and my question is, when the transistor is replaced with 2, it still has the same power. Should I leave the middle connections permanently? Thank you very much, Your Honor.

Your tester is very sensitive, is that an original sanwa?

I dunno if stk IC could replace by simple transistor, usually I prefer remove motherboard overall

Cách chuyển IC sang TRANSISTOR ampli👍

STK0039 es cuasicomplementario, lleva 2 transistores NPN, y el STK0040 es complementario, lleva un NPN y un PNP, además esos son darlington, el A1943 y el C5200 no lo son, necesita transistores drivers, falta el ajuste de bias también.

hi, can you please indicate what transistor reference i use and what the video does not show? in advance thanks for the solution

like this work but haven't done enough of it

yo quier a segunda parte no sean malos jajajaja saludes desde honduras

Hello all right, I ask you I have a Receiver The Fisher Sr 2004A the audio outputs are STK can I replace with which Transistor to be stronger?

Does this method work in any STK or it has a particular number it worked with

Thk you bro . .

Hy sir,I'm form Indonesia, please ,,I will show your realistict video,don't only schema.. Thanks....

pourquoi mesurez-vous la tension tout le temps?

No meu canal tem o video stk 1050 nunca mais !

Please make a video modify stk461 ic to transistor base akai amplifier

Tout à fait exact. J'ai déjà remplacé des transistors de puissance par des diodes musclées. Parfait. puisque ces transistors ont pour schéma équivalent des diodes non.

Hello, Mr. great movie 👍👍👍 you are able to tell me what I could change Sanyo rsn3305 to technics sa-ex120

Que se hace con la relacion interna de los pines 3 y 8. y el pin 1 y 10 entre ello hay varias piezas ?

Very good info.

Nice work!!!

where is the installation video and test results

Cómo estas amigo me gustaria conocerte tengo varios de esos equipos hace mucho esperaba algo asi no hagas caso a los que te critican, quienes lo hacen no aceptan qué tienes ingenio!!

Hay ,xin cám ơn

Do you have a source for original STK ICs.

i have a technics amplifier SU-Z11 Ç with STK-2028 broken , can you help me please!!

❤️👍

Dear Sir, may i have a question regarding amplifier technics power IC STK 2068 II , The problem we dont have available parts especially this Power IC, pls if possible try to help me how to convert to ordinary power transistor or else if you have an IC pls i will buy it...thank you very much and more power god bless you...

Hi there. Got JVC ja s 22 and is dead. No sound at all through speakers or phones input. It turns on, lights are present, can hear transformer but no sound. What to buy best? Original sanyo stk0040 or replacement. Any difference in sound? Thanks

good video...

Hola, tengo un stk 086 dañado, como y con que transistor lo puedo recuperar?

Ni siquiera se ve terminado ,así que no se sabe si de verdad ,funcionó así ,y si lo hace que tanto dure ,por qué no trae los integrados originales.

I DON'T SEE A PART 2 .... so I don't know if this even works , to me , changing darlington transistors with one transistor does not sound right.....

How many amps can handle Stk-0050?

Where can I find a similar clip with a STK402-090S or STK402-090SB transistor?

Part 2?

Nice jobs equivalency npn pnp sc5200 sa1943

Muchas Gracias

Next this work ok

do you have a diagram for STK412-240M ic

That stereo looks like it was in water ....

Hello, could you make a video for the STK402-090, would it be the same ????

Hello, I have 5.1 surround sound system(home theatre) here is the problem Couple of months ago it stopped working, as in it doesn't amplify the input sound to the speakers. But just yesterday, accidentally I plugged it to 110v source(normal 220v) and it worked, of course there is a buzz sound coming out it(I guess that's because of low power), on 220v it's still not working. What could possibly have gone wrong?

That's very brilliant but I found out that there's some STK with more than 10 pin. So what do we do when that happen

Bonjour ou se trouve la partie 2 merci

He's better than producer

Good

can you give me datasheet of STK412-240M ic thanks

Great job

I did replaced (not knowing) the output transistors were Darlingtons with normal ones on a Crown D150 amplifier. It hummed like hell.😢 It won't work.

Part 2 link.??

Very nice Background ..LOL 😂😂🤣

STR information, testing sir

STK next 2se5200+1943 ic Chlaga

I have a stk032 25w 10 pin what is matched vs ?

Lo hice hace muchos años atrás, siempre y cuando los transistores drivers y resistencias estén ok

Dear sir hamare pass amplifier me stk ic 4151ll lage he el channel band h kya ic aap stk ic4151ll laga denge please reply kya prize ka bill hoga

Hello friends Greetings from Venezuela I need your help I have a technics brand amplifier model SA-EX140, the integrated IC class H model RSN 3305 OF 26 PINS burned. INTEGRATED ARE DISCONTINUED BECAUSE THEY ARE VERY OLD AND THEY DID NOT MANUFACTURE I THANK YOU VERY MUCH YOUR GRAM HELP PLEASE FRIEND

Bhai Sony fh7 kay deck amplifeir pay koi video banao Aur uskay ic ko tt5200 \1941 k sath replace krna bhi sikhao pls

Thank u so much

Great music!!!!

When will part 2 be balé?

It is not possible to get some of the STK***** modules as they have been discontinued so if you can replicate the chip from the circuit diagram using descretes then that is the way to go.

Thanks brother

Good 👍

Oya saya sudah mencoba kok itu oke y😃🌺

GOOD AFTERNOON FRIEND WHERE IS THE SECOND VIDEO I WANT VELO

how about a stk 4181v sir,,can you help me

The music for this video is dope, what is the song and who does it?

Tengo un stk 404 -1305 etepa de subwoofer hybrido de un sony

link part 2 ???

Nice!

جيد

2nd transistor number not visible... Please mention... I have STK465. With Is not working .. It will be same as u doing ?

Stk 4026 is posible?

La segunda parte? No esta