Yamaha CA600 Stereo amplifier Snaps Crackels and Pops

Repair of a noise problem on a Yamaha CA600

[@MrOnegesius]

Your comment about no sparks reminded me of an old poem that turned me off working with 240 volts forever! "Pair of pliers, electric wires, blue flashes, now ashes". Slow but fascinating video.

[@missingsock18]

Dave, ignore the thumbs down people. They are not even worth mentioning. Your work is awesome! You, sir, know your stuff, and I salute you for sharing it. Thank you.

[@12voltvids]

They are looser's. Jealous loose's is all.

[@RoughJustice2k18]

I agree - screw the trolls and haters - 12voltvids knows what he's talking about. * much respect *

[@danmackintosh6325]

Wow this comment section is pretty negative with the trolls and idiots. Would love to see some of their perfect soldering and more important their diagnostic skills. Cool vid as usual, and don't worry about the thumbs down, in fact invite them to do it more, YT algorithms don't discriminate between thumb up or down, it's all interaction and helps your vids out! ;)

[@sirsuse]

Old video but that is a good looking preamp. Also, I like the build quality and repairability.

[@jeffm2787]

Thumbs down on the abysmal reflow of that relay? I won't give a thumbs down for that. Flux would have helped and a bit more heat. I've been soldering for decades almost daily. The sight of that did make me kind of want to loose my lunch.

[@danedwards4406]

Why would anybody's thumbs down this guy I find his presentations to be extremely helpful highly informative and easy to understand.

[@ryanolinski7163]

Why the hell would someone thumbs down this video? Great videos.

[@Bruceanddenise]

Some people are just vehemently opposed to JB Weld. They probably don't laugh at cat videos either.

[@rickclink9196]

Broken relay contact and worn contacts= replace the relay.

[@pvb9964]

@@rickclink9196 shipping cost worth more than the amp

[@RalphRacc00N]

@@pvb9964This amp is worth about 300USD. IMO.

[@BruceNitroxpro]

@@Bruceanddenise , Although I didn't thumbs down this video, his lack of proper repair protocol does rankle a tad. Frankly low class soldering method (such as no obvious desoldering equipment or use of flux) and other things such as mentioning that the age of the unit indicates a need for total recapping with high quality caps (AND not knowing that ESR does NOT show whether a cap is or is not bad). He needs a proper education in how to fix anything electronic.

[@neodonkey]

That phono pre-amp crackle could be used to get me to sleep every night, sounded like a lovely log fire.

[@woodysgeekchannel2204]

Always learning from your videos and always amazed at the work you do. I realize you have years of experience but still, wow. Thanks for the video. Working up the nerv to work on my Pioneer SX-850. Got it for free from a neighbor in mint condition. Controls are scratchy and some caps are bulging but watching you vids are giving me confidence

[@tough213]

there is not one way to fix a piece of electronics the way you do it is what is best for you and there is nothiner wrong with the way you fix anything as long as the results are the same keep up the great work you are a very skilled and talented and knowledgable person and never chage

[@jcoffin3659]

Thank you! This amp is my favorite in my collection. The sound it produces is unbelievably good to my ears. I use it for my turn table. I have the power / right channel low sound issue with a bit if crackling and i bet you it has to do with a dirty relay as shown here. I have always powered it on and off 2 or 3 times until i get clean sound, listened to my album and have always wondered why it did this. Now i can open this thing up in confidence. Thank you for taking the time to put these videos together.

[@justicelut]

Don't know why people would thumbs down your vids, they are very interesting and informative. Thanks.

[@josephatanacio3643]

I love old stuffs!!!! specially in audio, great sound quality!!!

[@golfman9290]

Even being in my sixties I'm still picking up stuff from your videos.really enjoy them, thank you.

[@12voltvids]

Thats called tricks of the trade, and I am sure those that are still attempting to make a living doing this are not to pleased.

[@Washburn-rr5eh]

Great repair job. I wouldn't worry about the thumbs down. The ones who do are just trying to impress other techs and to make them selves feel better at the end of the day. I been a service tech for over 36 + years and there is one thing I noticed. A true tech will praise another tech on job well done. Your videos are great!

[@12voltvids]

Thanks. Yes I have been a qualified AV tech for at least 36 years too. Started studying electronics when I was knee high to a grass hopper. Built my first Heathkit, in 1976 that was the GC1005 clock. Then built a full stereo receiver (still have that, will be servicing it one of these days) when I got out of high school, I studied electronics with a private instructor, at the first shop I worked at. He had been an electronics engineer in the military, and built RADAR, and radio installations during the war. He knew his stuff, and drilled me with theory. After 4 years of Special High Intensity Training (SHIT) I wrote the challenge exam, and passed with flying colors. Same exam that were used in the technical schools of the day. Covered tube and solid state theory, transmitter and radio design ect. I got a job with the Sony Canada, and worked for a year in their service dept, where I learned Betamax, which was invaluable as VCRs were just coming into the market. Sony wanted to transfer me back east to head office, and I didn't want to re-locate, so I left, and ended up at a large independent authorized service center where I did warranty work for Sony, Panasonic, RCA, Toshiba, JVC, Samsung and LG. Left the industry in 2003 to change to a different line of work, but I just can't leave my past behind. People in the community know me, and I get constant things to repair. It has slowed in the past few years, and I am quite pickey on what I will work on. If has more than 2 channels for example I am likely to pass. Big high power 2 channel amps, and tube amps are my favorite.

[@Washburn-rr5eh]

Very impressive career. That is one thing I wished I would of had. A private Instructor.

[@robgravell6989]

Absolutely brilliant It has been many years since I have seen such attention to detail within your Component level diagnostics... It was almost serene observing your methodology. Many thanks!

[@music_ph7783]

I really live old amplifiers. The sound quality is Pure and Perfect. I wish I could still fine some of those in Philippines.

[@premiere3610]

Wow thank you very much. This is the best video for repairing amp. I always wonder how they do it but now i am confident i can do it also. This channel will always be my reference and you are the best teacher in the world.

[@johnohara54]

Regarding your reflowing solder ; technique I learned in the military is a final sweep up the leg of the component to pull the solder into a “Hershey s kiss” finish ; less chance of solder bridges . Thoroughly enjoy your videos

[@michaelmurphy7512]

Great work! Total novice here, learning by watching and listening! Please keep up your good work!

[@wuss999]

I always upvote your vids before i watch them because they are always good!

[@scratchback2001]

After watching this video, it's a great argument for bringing back point to point wiring. Primaluna tube amps are point to point with some small pcbs for holding an LED in place. They're total garbage in a beautiful amp like this. PCBs are no ones friend.

[@eduardoaquino9162]

Very nice and straightforward repairing . It seems that no punk dared to give it a thumbs down. Love Yamaha gear by the way. Thanks for sharing.

[@12voltvids]

Thats because I disabled them for this video which I should do for them all.

[@Darryl603]

Nice work, Dave! Don't change a thing with your videos. I must say, you had to pull a few tricks out of your bag with this one! : ) Thanks for sharing

[@chakaone]

your repair videos are great. true oldschool engineer who knows his stuff keep up the good work

[@julianround4893]

Thank you - this led me to solve the channel dropping issue in my amp. I popped the cover off and mine wasn't broken like this one - but I cleaned the points with electronics alcohol and a small piece of paper soaked in the same liquid.

[@vapingwithjames3370]

Beautiful unit! Love the looks of the older gear all the new stuff is plain black and extremely boring looking. Great video

[@craneoperator4]

I subbed because I like your long and detailed videos...great work

[@joesakoor3400]

Awesome, fantastic, enjoyed you working through and solving the issues, I have crackly sound hopefully I’ll only need D.5 spray otherwise I need to send to an expert like you. All the best.

[@luiggimondoli]

Thank you very much for the tips. I fixed my Sony SRT-SE501, I found a lot of cracked soldering, the relays were clicking randomly and left channel had crappy sound, now it's OK.

[@Dillisive]

I always enjoy your content. But I prefer the repair videos over the building.

[@tinfore]

!!! JB Weld !!! You're my hero! I love that stuff.

[@benkrake3678]

Love the old Yamaha amplifiers. This definitely looks like a higher end model. Would really love to get one of the new high end A-S1100 amplifiers with the classic style needle VU meters. Excellent sounding amplifiers from what I hear. Great video! 🙂

[@afzaalkhan.m]

excellent diagnosis and tracking of a elusive fault.

[@SacreDro]

A big thumbs up sir, I am waiting for my Yamaha CA-1000 III. Hopefully not many problems or caps to be replaced.

[@gold27b]

Thumbs up. You worked through it in a very methodical way a its fixed!

[@mrnmrn1]

Dave, great job as usual, but let me tell my one (OK, two...) "complaint"(s). 1: I would have replaced that transistor on the same stage of the other channel as well, because they're now of different type in the two channels, which can cause channel mismatch (either gain, and/or frequency response, phase shift differences due to different Miller capacitances /if it's in the first stage of the phono preamp, usually this stage rely highly on Miller capacitance to determine the high frequency rolloff/) 2: I don't like spraying Deoxit on board mounted stuff. The oil residue will spread out on the whole board over time and add an oil film to everything. I've never used actual Deoxit (I think it's not available in Europe), but every contact cleaner I tried do this annoying oil creepage stuff. Thats their job, but I don't like it on the PCB surface. I've seen PCBs destroyed by this, as the oil ate up the rubber sealings of the capacitors, and than the leaking electolyte done its corrosive job on the traces and component leads. I used to remove everything I want to clean from the board, and if possible, disassemble them, and do the cleaning part by part. This is extremely labour intensive on huge pin count PCB swithes like these ones, but this way, you can remove the oxide layer, while if you just spaying it with Deoxit, it will dissolve the oxides, but it will stay on the surface as an oily goo. I use contact cleaners, but I wash them away after they done their job of dissolving the oxides, then I use silicone grease to protect the contact surfaces.

[@cdrepaircd5598]

outstanding job on fixing that yamaha and super job finding the bad part again super job and i love watching your shows

[@ciprianwinerElectronicManiac]

Great stuff. I forgot about using head and cold spray to troubleshoot intermitent problems like this. Cheers :)

[@Pyridox]

Nice repair. Yeah, good old JB-Weld has gotten me out of a bind many times too. And as far as the turntables, yes hang on to those legacy turntables. I still have my DUAL and Technics from the mid to late 70's. 👍

[@12voltvids]

Can't beat an old turntable. The new ones don't compare.

[@lamrubber3934]

P

[@ed10523]

I gave you a Thumbs Up..your Videos are Terrific. And The Goal is to make the unit/object operational no matter what. Cheers!

[@sundarAKintelart]

Very good... Neither I discard a part ( in this case a relay) that is good but with some blemishes... I try to revive them and revive them... A good dedicated work... Post more... I work in much similar way... Some times I improve the components.... On some high end and beautiful systems, I "laser engrave" the front and rear panel....to their original...

[@ronniepirtlejr2606]

I always give you a thumbs up! I've watched over 100-150 videos of yours, I might be wrong, but maybe you talking about "people giving you a thumbs down", WILL make you end up with more thumbs down than if you would have not said anything about it!

[@Tron1731]

I can actually hear the feditly change as you cleaned it my equipment used optical out from tv to sony str DA4es on 2 infinity sm155 studio monitors nice job 👍

[@andershammer9307]

I did one of those not that long ago and cleaned the relay contacts as well as all the switches and controls. That relay gets kinda hot. I had a problem with the phono input contacts that took me awhile to fix. Had to take apart the rear boards to get to it.

[@bugsyjonesband]

Your patience with some of these modern "throw away" electronics is admirable. and yeah, the hell with the Thumbs down. Obviously jealous. even with the more difficult repairs. simple common problems are (purposely?) so inaccessible, it's barely worth it but for the challenge. Keep up the great work and videos. I enjoy them immensely!! and yeah, i'm jealous... but in a good way.

[@minidragger2254]

Made me nervous when you started cleaning potentiometers and switches. I guess if you have done this type of work as long as you have you don't sweat the small.stuff. excellent video.

[@robertkeefer7791]

That classic oscilloscope is so cool.

[@gearheadted9210]

It never fails to amaze me,the disrespect shown by armchair "technicians",sure,some of these repairs are what you might call down and dirty but hey,this is the real world here,if people may not be willing to pay for a full on repair or restoration( which may be more than what the item is worth)power to you and those that have the balls to go and do something productive and be of some service to others,I commend you also for sharing your knowledge with all of us like myself who have limited skills and background but are learning,thank you!

[@12voltvids]

You also have to remember that most people want things repaired for as little as possible. In many cases they may want to sell the item, and want it working good enough to sell. They are not about to put a couple hundred dollars into recapping an entire amp when they might not get more then a couple hundred for it, but they will spend 50-75 to get the unit working, because the sale of something that is not working will get them nothing. This is the situation in many cases. I have had cases in the past where a client brings me an amp and says "change all the electrolytic capacitors". As requested I inventory and order in all the capacitors, itemize and charge accordingly only to have the amplifier back the next day because the owner no longer likes the sound. He was used to the sound it produced and now with all new capacitors, caps that have totally different characteristics from the ones made 40 years ago the unit produces a different sound. Not a bad sound, probably a cleaner sound but not the sound the owner was used to, and now he doesn't like it and there is nothing I can do because the old parts have already gone in the garbage. This is why I really discourage "shot gunning" all the old caps just because they are old. Sure the ones that have actually failed need to go, but the rest are probably OK, and contribute to the character sound of a vintage amp. Of course you are entitled to your opinion.

[@gearheadted9210]

@@12voltvids Yep,totally get it,been fixing cars 30yrs and can relate,thank God for the cool people that get it!

[@12voltvids]

@@gearheadted9210 Well you know the saying, you can't fix stupid, and you can't fix the trolls.

[@cheewurz]

C502 (2200uF Electrolytic Capacitor) on the ACC Line at the Input Jack is Bulged on top but not Leaking...measures Infinity. C315 (470uF Electrolytic Capacitor) on the BATT B+ Circuit is also Bulged on top but not Leaking...the bottom is blown out on this one. Both are in Parallel with + & - and are not Shorted . All Solder Joints & Traces look fine as do all Components & Board. The Unit doesn't light up at all.

[@swcrites]

love your videos!! I have a feeling that maybe you're every day job is a teacher? It definitely seems like it. Your videos have taught me a few things, but they have also given me the wisdom to know when it's time to forward whatever issue I'm having to someone like yourself.. sometimes I don't have the correct tools or knowledge/experience and don't want to break my project further haha. anyways, keep up the good work. I'll always be looking forward to the next video of yours! Much love from Sacramento!

[@12voltvids]

My day job is actually the phone company. Well these days it isn't so much phones, it is internet, TV and fiber optics. I do have an engineering background though.

[@rusty1187]

WOW! I haven't seen a chassis like that since 8-track days!

[@atomkraft69]

I love your videos: it's like watching a "documentary" on TV😃

[@cheewurz]

From your Experience... why would the ACC Circuit measure Infinity from the ACC Pin to Chassis Ground? Sony CDX 4090? Batt Circuit is in the 1 Meg Ohm range.

[@Dillisive]

Such warm sound with this Amplifier

[@12voltvids]

Not even close to a tube amp.

[@lexmal3303]

Hi Mr. 12volts would please tell me the name of the band of the audio you use in this video, it is on 18:43. Thank you.

[@zorbzzsterio6406]

Awesome vid also huge Thanks for the info about the nte quick cross program it is going to save me a lot of time and headaches finding replacements

[@maffecarlberg4915]

Thanks for sharing your great knowledge of repairing...! I watch and lern!!!

[@micheldaviau7781]

Hi.. i got a similar one at home... the CA-800... same kind of cleanup to do... but i also got a Photo input problem : no sound from turntable in the Photo1 or Photo2 input... Do you think the problem could be from my Turntable output ??? i aint got a second amp to test the turntable...

[@markmcgauley3000]

Hi. Thanks for the great videos! I'm an avid viewer. I have this exact amp. I rescued it straight out of the trash. Could you offer some assistance as I have a Yamaha M-60 power amplifier and I trying to connect it to the CA-600 and use that as a pre-amp but when connected it just doesn't seem to transfer the power. Is this because the input voltage is different between them. The CA-600 is 0.775 volts and the M-60 is 1.24 volts? Thanks for any assistance you can offer.

[@adriaanroeleveld5823]

Great video! Gave me quite some pointers for trouble shooting amps.

[@vapingwithjames3370]

One of my favorites is the Yamaha CR-3020. Great video

[@truthteller1475]

Thank you for sharing Sir. You are the SME. Subject Matter Expert.

[@jerrypeal653]

Nice , I’ve used a pencil eraser on contacts but I like that bottle of solution.

[@committments]

Great job, just came across your channel im fixing a similar one for a client with many issues but these are good receivers. Also great channel just subbed!

[@clintdouble-u9564]

So impressed with selection of Python :)

[@wadehicks9270]

When I first came to your channel I thought it was gonna be car audio related by the name of it 12 volt videos. I've always wondered how you came up with that name ? You always do great work Sir enjoying watching.

[@12voltvids]

I drive a 2012 Chevy Volt, and the first videos were about the car, and then I started doing the AV repair videos so I never bothered changing the name. My company was All Tech Video, so I was initially going to call the channel All Tech Vids, but the 12voltvids stuck, and the rest is history.

[@ThejasonJaw5442]

Love your Work how you trouble shoot issues fantastic work🤠

[@steeloned]

Very nice fix, subscribing. I have the same amp and switching it on does nothing. After checking fuses, any advice what to look to first? second? I have the overall schematic, block diagram and internal view copied. Thanks Dave for the teach.

[@hughmc5419]

Sounds good, that receiver probably would sound great on big speakers. Watched your TDK was that the brand on your stereo drift. I did an alignment on a Denon , very similar problem, they have a stereo /muting switch. Note: I found that if you are super close to a transmitter you can get wash over or image issues with FM stereo. I am a mile outside Chicago, some times if I go up on actual signal, & this is a Digital readout my stereo /signal light will both fire. It looks very similar to your TDK.I am going to walk up a flight & get model & I'm back. { Model is a Denon -precision audio component / tuner amp DRA -300 it has a stereo muting switch for FM. I did an alignment with DMM , it sounds really good massive heatsink. Finished metal cover in black crackle spray paint. Take care ,Hugh Mc. Chicago , metro PS : The 2SC1345 is a low signal NPN amplifier transistor with a collector to emitter voltage of 50V and collector current of 100mA. Good repair on the Yamaha, yes thumbs up !!!.

[@12voltvids]

I tell you what does sound great. My crest audio 900 watt amp.

[@velixzeen]

@@12voltvids my buddy that does audio in Mantooba has six or seven crest amps in a rack for live/stage stuff. Great amps. He gets lots of, "If you ever want to sell those . . ." comments.

[@12voltvids]

@@velixzeen i have a crest vs900. It has balls allright.

[@juliomayer812]

Your the man wish i knew what you know.thanks for the videos

[@affzaal]

excellent diagnostics on all the videos I have viewed . thanks you!! Rawalpindi Pakistan.

[@adnanakram5735]

Hello

[@adnanakram5735]

Karachi pakistan

[@v1ncend]

learning a lot from your work's stuff, love your channel, love electronic :D

[@24getful1]

Enjoyed this so much. Keep them coming.

[@conwayjames1]

I think it dreadful nobody even gave you a single thumbs up as it was a great video well done man, at least you did not do as bad as me, I gave a Romanian lady in the space of 8 months €46,000 and believed everything she told me but it was my own fault, I am trying to repair electronic stereos TV's and hi-fi systems to make some of the money back, I don't know why more do not at least say something about all of your hard work I think it unfair.

[@12voltvids]

I have plenty of thumbs up on this. Over 1000 thumbs up vs down I just didn't have them shown.

[@magnusnielsen2648]

don´t get mad at the thumbs downs, they help your views just as much as an up one

[@ChrisSmith-ld5wt]

How many watts is the Yamaha thinking of getting a ca 810 cheers

[@harryhall5092]

Just got through with a CA1000, these are awesome sounding amplifiers, I just recapped it and a couple other repairs and cleaned all the controls with Deoxit. I am now using it on my computer for sound as I do audio editing and music restoration. Listened to this video on the CA1000. Great video!!!

[@markmarkofkane8167]

Thumbs down people have pathetic lives. It makes them give a sense of satisfaction to put down others.

[@MrTopsoil911]

same amp same prob . fix just same way u did. great vid.

[@jasejj]

Curious that phono pre-amp noise. In the last week I've seen that same noise (in person or on YT vids) here, on one of Dr Cassette's videos and a modern 'Sansui' branded integrated amp I bought off eBay. And three different diagnoses -- transistor fault here, b0rked selector switch (DC) and a badly-soldered op-amp on my own unit. All with more or less the same symptom.

[@12voltvids]

Yes a dirty switch can cause it. So can a bad connection. I looked at that first. I cut the part where I re soldered the preamp board because it didn't cure the problem, and the video was already long enough. If you see my watch in the shots you will see how much time was put into this unit, which was about 4 hours.

[@milanmarijan14]

is that conductive epoxy that you are using

[@andrewfox1446]

Brilliant video just one problem though regarding the relay why didn't you just replace the relay and replace it with one that doesn't rust or oxygenate surely putting in the old relay even though you have done well to get it working again is it going to fail again surely

[@12voltvids]

Still working perfectly. These are not hermetically sealed relays. Contact cleaner keeps the contacts clean. I could have ordered a relay but ordering anything from mouser adds huge broker charges at the border. They charge something like 20.00 to ship anything to Canada. I ordered a small transformer for an antique radio I was working on and by the time the transformer got here it was 100.00. btw that transformer was made in Canada, but the manufacturer (Hammond) would not sell direct. I had to go through their exclusive distributers mouser. It was 60 plus 20 shipping. By the time converted to Canadian funds over 100. So unless I absolutely have to order a new part I won't. If a part like a relay can be repaired then that is the route to take. If done right it will last as long as a new one. Obviously a hermetically sealed micro relay like used for head switching of low level signals this won't work but for a speaker relay no problem.

[@andrewfox1446]

@@12voltvids Thanks thanks for your reply my friend love your videos and I love the old vintage hi-fi if I would have known that I might have been able to save myself a few pounds you learn something new everyday thanks a lot my friend and I love your music not many people like seventh day but I loved it Rock on fella greetings from the UK.!!! 😀😀😀😀

[@12voltvids]

@@andrewfox1446 You would be surprised at what music I like. I listen to many types of music, from Garth Brooks, to Wayne Shorter, Metallica, to the Beatles, Chieli Minucci to Theory of a Deadman, AC-DC to Nirvana, Motzart to Isaac Stern. You name it, Classical, Jazz, Fusion, Rock, Metal, Grunge, everything except for hip hop and rap. That crap send my hand heading to the dial to find something else faster than rolling down the window when someone farts in the car! :-)

[@andrewfox1446]

@@12voltvids Brilliant video mate I too like lots of different types of music it really pushes stereo through its Pacers I've got some vintage hi-fi but at the minute I listened through my onkyo surround sound which surprisingly plays stereo super I'm 50 years old so I can't really tell that much difference between AV amplifiers and hi-fi amps good choice of music there as well I'm always listening to the original Van halen Van halen one for me is just music to my ears but classic rock is my fav well I shall leave you alone my friend keep up the good videos and hope that you repair many more vintage stereo amps 😎😎

[@12voltvids]

@@andrewfox1446 Yes I have another Haffler in for an overhaul. Got to get on that one soon.

[@krasimiraandreeva6075]

Great video! I have a question though: I have the CA800 but can't get rid of the hum and buzz problems. Do you think that this is a "standard" issue? Is there a way to bypass it? Thanks!

[@jeroenschuuring6060]

Humm and buzz are Never standard issues....

[@cheewurz]

You have a Schematic for a Sony CDX 4090 AM/FM Receiver I could Borrow?

[@12voltvids]

I don't have any. I get what I need usually from HiFi engine.

[@frankreiserm.s.8039]

This was a very good video. Very academic.

[@doubledigitdreams]

More videos please. Great stuff.

[@ElectoneGuy]

Good repair. Was that faulty transistor one of those Hitachi slant-back style transistors? The Hitachi 2SC458 is another slant-back that is notorious for going noisy

[@12voltvids]

Yes it was a Hitachi Slant back.

[@ElectoneGuy]

Figures. Those things are notorious. First thing I do when I get weird noises in equipment is look for those Hitachi transistors and yank them. Problem is that they usually test fine. 2SC458's get replaced right away with KSC1845 or 2SC1815.

[@oswaldfraser4946]

Great work, one of the best explainer, do u gave advice on how to repair other sets that u don't have in your shop?

[@upsidediy3945]

Interesting cd inputt wasnt switched or plugged in to phono input , for a quick check, after transistor was replaced. Could of tested both inputs for fun .ar 47:00

[@12voltvids]

What are you talking about. Of course it was switched to phono. Both Phono 1 and 2, as well as the moving coil setting. Then I plugged in the turntable and tested it. What point would it have been to show both inputs being tested? They both go through the same preamp. All 3 snap crackled and popped prior to the transistor repair. Would you like to see all 4 hours of the raw footage to convince you that I did indeed check the inputs. It is called editing for time. As it is I get shit from people claiming it is too long.

[@upsidediy3945]

You use a cd player for input test, Than to test the phono switch repair you used a turntable. I would of just plugged the cd in that port, for a quick test. Your way was better . because you can test both inputs with the switch.

[@12voltvids]

Actually it was a DAT player I used as the source for the aux, and no I couldn't plug that into the phono input, the level is way to high. All you would get is distortion. I have a little Teac portable DAT that was sent in from a viewer in Australia. Needed a pinch roller that I happened to have, so I use that as my line level source.

[@AaronBilger]

What is the most common part on a amplifier to fail in the new amplifiers for home or pro audio by any chance?

[@12voltvids]

There are no common parts that fail. Some will fail more than others, but these are usually caused by accident, such as speaker wires shorting, ,which can cause the outputs to blow. Many receivers, use power ICs and these can be problematic, and some use driver ICs such as the Sony I did awhile back, and the heating and cooling of these modules can cause the solder to fracture and go open connection. So amplifier problems can be a mixed bag of faults. Open resistors, shorted or noisy transistors. Sometimes capacitors go bad, but this is usually NOT the case. People will say "why don't you recap that unit?" Well the truth is that most capacitors will never fail. In most instances a capacitor is being used as a coupling device, and is not operating at high current loads. It is blocking the DC voltage from one stage, and coupling the audio to the next. Unless it was damaged during installation, and the electrolytic has dried out they are good for many, many years. Capacitors that will eventually fail are the ones in the power supply, as they are handing high ripple current. Capacitors in switching power supplies fail even sooner, as not only are they handing hogh ripple current, but they are working at high frequencies too.

[@curiosidicas]

hi there! Great vid , I'm a beginner, still on classes and If you allow me to make a question.. I'm fixing a technics SA DX940. It does power on as soon I plug the AC but the front panel can't turn it on. Fan runs for a bit while and stops. Maybe a protection mode...I also identified that the power transformer is outputting about 20% more voltage it should and It algo has a buzz sound. Is it acceptable? Would this power transformer failing? Really thanks for your time! :)

[@Inflec]

+curiosidicas - It would be a VERY unusual failure for a power transformer to output more than it's stated voltage. Conceivably some shorted turns in the primary winding could cause it but the shorted turns would also cause overheating/odor/smoke. More likely, if your readings are correct and it actually is putting out excessive voltage, the cause is probably an incorrectly set voltage selector. Some appliances, particularly those intended for international use are equipped with some means to match the device to the line voltage of the location it is going to be used at. Typically the selections will range from 100v to 240v. If the selector is set for a voltage that is less than the input line voltage the transformer *will* output more than it's intended voltage. If the difference is not too great the unit will probably still work but the power supply and other areas will run hotter than they should, which will eventually cause something to fail. So unless your transformer is overheating, look for a misadjusted voltage selector.

[@vitorpandeque4896]

Hi, been watching a lot of your videos and I admire your work, im in Brisbane Australia and have a loudspeaker repair business, I need your help with info if possible, I have 2 amplifiers, both Luxman, one a L100 and the other a M2000, both have intermittent problems, one channel has random crackling, its hard to pinpoint as it comes and goes, the L100 has had the channel completely rebuilt, I mean every component...and still has issues, the M2000 has had all capacitors replaced and driver transistors on the main pcb...no change...im at a loss...

[@khalidahmedkhan]

I only watch your videos in 480p. Internet is slow in my country.

[@petrhorky9034]

Hi, great video, really helpful. What is the name of the app you are using to find the transistor equivalent? Thanks

[@12voltvids]

NTE QuickCross. It is in Google Play.

[@suchitabanerjee4642]

sir, how to fix sonodine deck not playing? pls suggest.

[@antoni881]

Hey i have a sony cx333es cd player that has bad rca contacts can this be fixed? A par of rca fixed out dont work as all the others cut in and out if wiggled

[@12voltvids]

Resolder them to the board.

[@Silent-Lucidity]

Don't sweat the thumbs down. Look at at all the positives.

[@craggercragger8989]

You cued the "sit in my face" at the end of the video so perfectly pal :D F--k the haters, play them that looped for a while. Great video, thanks for continuing to post these, have learnt a lot of useful tips in my travels in terms of fiddling with 99% working units and being able to get full use out of them.

[@12voltvids]

That was the intention. I will definitely play some more of that album again.

[@wd3574]

Nice video. Your repairs of audio equipment are my favorite. As am amateur hobbiest, I don't know how you immediately assumed/diagnosed that the noise in the phono section was caused by a bad transistor. I suppose that is what your years of experience and knowledge gives you?

[@12voltvids]

The noise was isolated to the phono preamp because the noise was only present when phono input was selected. That ruled out everything else except the components in the preamp. 40+ years working in electronics helps. I have built many amplifiers, both tube and solid state, and repaired literally thousands of units in my career in a repair shop.

[@countteddy]

monty pythons instant record collection !, well done sir.......

[@brentmarsh1325]

how did you heat the Transistors up with the iron did you touch it or hover near it? will it melt if you touch it?

[@12voltvids]

The material the transistors are made from is relatively heat resistant, but no I didn't make contact with them. Just hold the iron about 1-2mm away so heat would radiate into the transistor.

[@bagpipeswest]

Thanks, great tips ,, love all your vids.

[@ukaszkrupicz568]

Next great movie and now i know how to check bad transistors :)

[@12voltvids]

Heating and cooling finds the fault in noisy transistors in many cases.

[@12voltvids]

This is a common way that transistors fail. Heat and cooling is a fast way to pin point. I use just good old duster and invert the can so the propellant sprays out. Cools to -70'C