2-channel power amplifier restoration - Restore step by step

[@tableseven8133]

I think this is the first restore/repair I ever saw of your's. I will hold all negative comments. I was glad to see your simple technique for testing the transistors on an analog testing meter.. Not so easy to do that on a digital testing meter. Your video kept my attention.

[@selectorerwin1don12]

Lol for real but i think thats the old school way also da best way

[@turnepokkamandag2138]

Pake ko 😆

[@rodrigosantosmello9932]

Esse cara e fora de série

[@reinaldospear2266]

Excelente profissional 👍 Botei fé 🇧🇷

[@hanhduy4540]

Bác thợ này cao nhân ! Chúc bác nhiều sức khỏe !!!!!!

[@AJ-jo6qk]

bongkar abis nih heheheh

[@charin1970]

สวดยอดช่างของจริง ทำแล้วต้องดี

[@xhabirzejnuni6652]

Complimenti.

[@salmaankhan4318]

Super amlifer super very good video nice work very very good video sir thank you

[@khasrumia5093]

very goog jov..i like

[@classiczzize]

cool bro i did fall asleep

[@carlosrobertonascimentosil9033]

A sua profissionalidade é incrível, parabéns pelo o trabalho muito bem feito. Sou aqui do Brasil da cidade de Fortaleza Ceará.

[@jesusjoaquinpool4456]

Si Hola hermosa bien trabajar

[@catden17]

my no.1 dream i have a power amplifier .. watching from phillipines

[@schemkesa]

grreat job

[@SauvikRoy]

21:09 What a monster that!😎 Great work!👍

[@VivoVivo-zh2tq]

From Malaysia...👍👍

[@JorgeFlores-xl2nv]

N. E. G. A. T. I. V. O. !!!!!!!!

[@deepdance111]

I have so much respect for what you guys do...Gretings from Poland :)

[@creativelife4453]

awesome restoration, i learn from you much

[@MarioCruz-q9x]

Te felicito por darle vida a este buen ampli, saludos cordiales Nezahualcóyotl México

[@myvideopradip.s2136]

Nice work sir.

[@narasimhachary1654]

Great, you are full fledged service personal keep it.

[@rkangler]

Weldone my friend. Very nice restoration. 👍

[@hasanuddinlalot4363]

Master nya Power, hebat 👍👍👍👍👍

[@alemelian8220]

Hola amigo sos lo máximo la tenes bien clara a la electrónica como quiero ser como vos para trabajar así y hacer mucha $$$$ soy de argentina salta veni a la Argentina yo te doy donde vivir

[@Tom-zq7lu]

FANTASTIC, RESTAURATION, BEAUTIFUL AND VERY VERY BEST OK 👍🆗

[@leok6299]

Excelente trabajo!!! 👏👏👏 🇦🇷🇦🇷

[@ramabhairatdiyabharwad-8182]

Jordar Sarvis Kari Chhe Ho Bhai

[@TempoDrift1480]

Yeah man, nice work. Watching from United States.

[@ДмитрийДонцов-б5в]

Super!👍👍👍

[@catcheat6945]

Sir, with people like you this would be the perfect world.

[@braydenh190]

Especially since its ending.

[@babuutech9451]

For sure you are great technician by professional big up man .....I got some things from your job

[@kaylapratita275]

Sangat detaell. Serwis dan bagus.👍👍👍

[@patrickphilippon]

Beau travail soigner bravo

[@carlosazambuja1742]

...applause, master job, it´s a pleasure to see this restoration...

[@cameronwilson8561]

I love it how mr electricity never wears gloves. Until the bucket of soapy water come out… 😉

[@kangtodinasty1800]

Mantaaaa bossss

[@antiqueland7491]

Ok , very nice👌👌👌👏👏👏

[@kauanvideo5285]

//KAUAN ViDEO\\👍👍👍👏👏

[@joseaguilera1512]

Es un deleite mirar la forma de trabajar,felicidades.

[@toanbui3549]

A sua chua chuyen nghiep hay qua ko biet dia chi o dau sa binh luan toan tieng nuoc ngoai xin cam on

[@baniadamtv]

Nice work, Nice amplifier.. 👏👍

[@somasundaramsomu2013]

Super create👍

[@renemartin6002]

Bravo mr on a besoin de vous ici merci

[@badtensioner]

Installing power transistors without checking voltage bias is very risky. You might end up changing them again and again.

[@JRNelson78]

As i saw, there is no trimmers on the PCBs. SO i guess it`s an automatic biasing, they monitor the output offset, and may be that chip on the board (may be OP amp based circuit) ajdusts it.

[@2Cineman]

I've repaid many amplifiers, and in most cases where ther are blown output transistors, the drivers are usualy blown too . didn't see the guy do any fauslt finding, other than a diode check of the output transistors - fake ivideo if you ask me

[@Learnelectronics738]

Very good video Amplifier Thank you

[@rooseveltdorado1816]

Hi friend what is the name of leguid uyou used to clean the board

[@mroyyoutube]

axetol or u can use isopropyl alcohol 99%

[@timschutte6924]

Nice, I'll buy it now !!!

[@H-77]

Looks to me like one of the many inexpensive amplifiers that cloned the layout of the Crest CA series amplifiers. No schematics appear to be available, although the lack of mica insulators shows that the circuit topology is not the same since the collectors are apparently grounded. By the way, there is a torque specification for TO-3P transistors, usually between 5 and 10 inch-pounds- significantly less than people tend to think. It has been mentioned already, but there is a reason why the original transistors failed. Checking the quiescent current in the output stage as well as running a sine wave test into a dummy load and looking at the output on a scope are worth doing.

[@gino3286]

"the collectors are apparently grounded" i would like to ask if this is a good technical solution. It seems very convenient for output stages. I have a qsc usa 400 and i guess it is made in the same way ? What low power pro amp would you recommend ? something with 250w/4ohm i mean. Thanks a lot and regards, gino

[@H-77]

@@gino3286 Very much depends on the implementation. QSC has had a lot of success with that topology- they perform well and are very reliable. I've never really played with the topology myself, but eliminating the mica washers has both thermal and cost of manufacturing advantages. Another way to eliminate the need for mica washers is to use separate, hot heatsinks for the NPN and PNP sides.

[@gino3286]

@@H-77 I think it is a interesting method The heat transfer must be optimal and also the thermal equilibrium between the output transistors. Grounding the heatsink maybe improve also safety ? Thanks a lot again. Kind regards, gino

[@hoangcamcdldtanlap1617]

Mình thích cách bạn làm lắm

[@skhosanamathiyane]

Ye man,nice job indeed,,,,,,,,,South Africa 🇿🇦

[@selectorerwin1don12]

Good job definitly i wasnt gonna take all those wire apart..lol amp looks n sound good

[@gervaziovieira2411]

Very good.

[@samuelmorales2612]

Hola saludos mr Electricity te felicito es un buen trabajo muy bien hecho así habían de trabajar los que ven tus videos saludos desde puebla pue.Mexico

[@CarlosLima-gd8fy]

NOTA 1000...PARABÉNS!

[@skylinefregion6167]

Wow very nice restoration.

[@JohnvL]

Nice Job!

[@Balthazare69]

Little more and u will have whole sound system for big concert xD As always great work, bravo!!!

[@sabangoktas6951]

SÜPER BIR IŞCILIGIN VAR ELINE SAGLIK

[@burkhardboer5524]

Macht immer wieder Freude einem Experten über die Schulter zu sehen. Großartige Arbeit!!! glG.

[@trentjackson4816]

Competently skilled technician. 5☆

[@ocad-odong]

Muantap👍sukses selalu kawan🔔👍 aku yakin kawan bukanlah kacang yang lupa akan kulitnya.salam kawan baru dari Bogor 🙏

[@maysalvador202]

he's great, i will bring my ingrated amp for restoration. God Bless Mr. Electricity.

[@josealvessilva556]

esse sim sabe trabalhar e ñ tem preguiça parabéns o seu trabalho é nota 1000

[@eduardoroxas8149]

Mr Electricity you work amazingly seems you knows the design and circuit configurations of the amps didn't see you label or marks any of the hook up wires .

[@xetaiochoi3165]

Cái này có bán kh anh

[@Kirill_Maker]

Did you check bias and drivers? And capacitors too.

[@OriginalFinnish22]

Subscribed!! because damn that transformer is HUGEE!!!

[@bangladeshjindabad1643]

এগুলোতে প্রচুর সাউন্ড হয়, ভাল মানের 4" 4" কয়েল এর স্পিকারে,

[@fjchiu7489]

你在台灣嗎？想修改低音喇叭箱。

[@markmiller5889]

This guy is amazing !!!!!!

[@kevinpotter7899]

Great video ... but replaced all those shorted components ... all back together and flick the switch and Voilà !! works !! Surely there was abit of last minute oopsy in between ??

[@AstrosElectronicsLab]

Meh, don't think so. Usually when output transistors short (because the output was shorted to ground), replacing them is usually all you have to do - if you're lucky. As long as it didn't take out any of the biasing components, all good. It looks like at least one fuse blew on each board protecting the rest of it.

[@danielcifuentes6145]

Amazing job! 👍

[@jeffr0]

Mr E, theres no way that you know how all that goes back together. I'm convinced the 2nd half of this video is just the 1st half running backwards.

[@AstrosElectronicsLab]

Doubtful. Also, a camera was recording the entire time. It isn't too hard to go back and look at shot footage to see where things go. Plus, if you work on enough amplifiers (I know from experience), it's not hard to work out where wires go. PCBs are marked and cable lengths bend over time to roughly where they want to connect to.

[@robertgorge1152]

Very good job.

[@christopherouat3455]

super restoration mais normalement il faut mètre le volume a fond sur l'amplie après on règle sur la table de mixage

[@franciscohelioandrade9782]

Excelente trabalho ficou top de mais 🇧🇷🇧🇷🇧🇷🇧🇷🇧🇷

[@СергейПетрович-н3ы]

хорошая работа молодец

[@gafurjaborov9571]

Привет где этот мастер я адрис не понел лотинский читат не умею руский магу

[@gino3286]

Hi nice amp indeed. It looks very well designed and also parts seem very well sized. Great job as usual. It is a pleasure to watch your repair videos Thanks a lot. Kind regards, gino

[@angngocson9471]

Can i buy this?

[@bhutkaderaghunath7130]

nice work brother 👍👍👍

[@AdiMughal4u]

What liquad you used for pcb cleaning its best, can you tell me name?

[@gino3286]

Dear Sir, thank you very much indeed for your always very great video and very educational. However i like to use a little brush for thermic paste And the electric drill seems to have too fast rotation. Clearly you were in a hurry ... i love your videos. When i will retire i will try some restoration work ... i love audio equipment deeply. Thanks again and kind regards, gino

[@gustisudirmansah7870]

Kalau merakit power yg sepeti ini kira2 habis brapa biyaya nya makasih

[@ജെക്കബ്എംജെ]

Good work

[@WayniKlaru14344]

thank you so much for this video. I wish I have the confidence and technical expertise.However, looking at this video helps me a lot gain more insights and understanding on how and where to test some basic troubleshooting area of known issues. It looks easy in the video but they aren't. I am now a big fan of your talent. God bless you Bro ! Keep doing what you love to do. If you need a partime apprentice in the weekend. I would like to apply.😁 #loveelectronics #cebu

[@catherinesong775]

Awesome guy!

[@Arispogiiiiie]

what isa the name of your liquid dispenser i like it

[@ELMDJ]

دا دكتور جراح مش مهندس صيانه يارب اشوف هنا الكلام دا قبل ماموت

[@موجالبحر-ج2ك]

Thank you for the thanks to this work which is more wonderful and tag that you are all quiet. Order your honest sanitary maintenance of modern auctions from where we start. This is our voice and respect, our gravity profession

[@armandolaguidao5757]

GD morning sir saan po kau Lugar may ipapaayos po ako

[@МаксимГордиенко-и7е]

Молодец, very good job!! 👍

[@flamedub]

Tidy work. I have an old amp very similar.

[@alferjr2652]

sir can i ask what you use to clean the the board.look that your so good doing well.

[@warmachine1373]

What kind of cleaning chemicals are you using for cleaning all the electronic boards????

[@alexeymagov7291]

Very good!!!!

[@albertchiu655]

the man is capable!

[@juareizvieiradesousa467]

Fico top

[@rcfaudioitalia6110]

Chinese stuff nowdays is better than expensive big brand stuff.

[@dinhocortes2456]

Que maravilha 👌