Sweeney Todd's Amplifier: Setton AS-1100 (What's left of it)

[@xraytonyb]

0:00 Intro 4:40 A first look inside 5:43 A look at the underside 7:08 Looking at the power supply 9:00 Repairing the power supply board 10:36 An unpleasant surprise & a minor Tony Rant 14:37 Continuing troubleshooting & repair of power supply 22:41 Carbon comp resistor (sans smoke) 24:39 Blown fuse on the panel light supply 25:39 Resistor on negative power supply is also open 25:50 Resistors are replaced - First power-up 29:10 looking at the schematic 34:29 Amplifier board is installed - first test of amplifier 40:50 Bootyfab breadboard circuit with theory and test of protect circuit 49:12 Found the reason why the unit won't come out of protect..... 51:10 Protect circuit is working, indicator lights still not working properly 51:34 That amplifier is working! 52:32 Building the "security circuit" on a proto-board 57:43 Testing the amp with the "new" board 59:28 Final testing and closing comments

[@scottdrake5159]

Wow. Unless you're editing out a lot of failures... this may be one of the most impressive hi-fi repairs on YT, from anybody. Using your domain knowledge to put together that amplifier with a misleading schematic, cut harnesses, and an entire missing board... and making it sound good. Quite a thing, congrats.

[@micrometer1484]

Wow! I wouldn't have known where to start if I were in your shoes. Thanks for sharing your knowledge with us.

[@isoguy.]

Thank you for such an awesome investigative project and the explanations of what you were doing as the project progressed; a real education. Thought you were going to make reference to an artist "formerly known as" Q617 known as Q17 on the board, or reference to a Bond movie. Really enjoy these longer vids with less left on the cutting room floor.

[@montynorth3009]

A super restoration, and the final result sounded particularly good over headphones, especially that strong bass.

[@dblake5356]

Thanks for sharing your videos with us. This one was awesome to watch. You really rescued that one from the scrap heap.

[@mistermac56]

Excellent work. As one of my old bosses would say, more money was spent on the "pretty" (power meters, protection circuit indicators and related circuity) and less on the "nitty gritty" (circuit boards, components). The history of Setton International is interesting. Jacky Setton, a British entrepreneur, made his fortune importing Pioneer and other Japanese electronics manufacturers products for the French and UK market, real estate, and selling racing cars. He's more well known for yachting and yacht building. It is said that the Setton line of audio gear was manufactured by Pioneer and was more expensive than similar Pioneer models. Setton International was only in business for four years, from 1977 to 1981.

[@xraytonyb]

Thank you so much for that information! I know I read about him somewhere and this answers it. Thanks!

[@geraldmosley2195]

Hey Mr Tony, Setton was built by Pioneer and it was featured in playboy, they was not in business for long.

[@tommybewick]

What an amazing job building that board from schematics with missing information. I envy your ability to read a schematic so well and understand the functions of the various circuits depicted in it. I always learn a lot from your videos and this is one of the best. Thanks! Any recommendations for a good book on reading and understanding schematics beyond just identifying components, but understanding the circuits and how they work?

[@exenx2995]

Tony you are the Master here on KZbin . Im hoping someday soon you will tackle the 1982 Realistic STA-2080 these receivers sound beautiful but for some reason they all run a little on the hot side with correct biasing I know you could find the original design mistake causing it to run hot . Also your past video on the STA-2200 was awesome. being Realistic it's about the best sounding receiver I've ever heard in that wattage range. Keep up the great work Tony --YOU ROCK!!!

[@david4368]

I love it when the $$ circuitry gives its life to save the $ fuses.

[@Parkhill57]

I noticed it is missing the relay rack handles also. Probably on someone's cupboard drawers now.

[@peterkuchenbecker5251]

This has been an hour of magic for me , wonderful work .

[@seanobrien7169]

Talk about a hack job. Nice work building that board, I was surprised you got that thing working without a million hidden problems.

[@stevec5000]

Tony you must like torture? Wouldn't it be a lot easier to just go to the dentist instead?

[@PrimeHiFi]

Great video for a cold night here in New England. Glad to see more repair and restore videos Tony! Cheers

[@DavidSmith-zx7wz]

This is why I watch your channel! Good Stuff... Thanks

[@skooterfd]

Sounded great to me, wearing my headset!

[@davidgriffin79]

1:04:28 Agreed; listening through Beyerdynamic DT770 250Ω that bass was tight and tuneful.

[@t1d100]

Excellent! Enjoyed seeing you work from your personal knowledge base... Missing parts of the schematic, etc.

[@jonathanhendry9759]

Maybe F3 blew because the power was on when they cut the wires to the alarm bulbs.

[@erikdenhouter]

The art of un-butchering. Good job on a very nice looking amp.

[@jutukka]

Very enjoyable video! 👍 Thanks! Of course, in the name of fairness, I have to thank that Sweeney Todd as well, because without his or her massive contribution such a wonderful video would not have been possible! 🤣

[@samuelfellows6923]

12:11 ~ “hacked out and baked in a pie” 😂

[@hi-fidude6670]

I have a love hate relationship with Setton. When they work, they sound great. But when they go bad it takes a lot to repair them

[@dougb3699]

I worked at Setton at the onset. The owner did want to update the line and the company went out of business after about 3 years.

[@nickpopa7260]

Another demonstration of mastery in electronic repairs. A joy for the eyes and ears of amateurs eager to learn.

[@TheBababa420]

I had to google Sweeney Todd.. Oh well.

[@cskeet1320]

I had static noise on both channels of my Setton AS1100. Not affected by volume. It was tricky to find the source of the noise. It turned out to be noisy transistors (with black tarnished legs) on the microphone EQ amp and this noise was leaking into to system even with mic gain at minimum. New transistors and a re-cap of the mic EQ board eliminated the noise.

[@jaybats7865]

WOW! You truly are amazing Tony! Your thought process, knowledge and passion for this work is totally phenomenal. Watching you bring back these old units from the dead is so much fun. Congratulations on another great job. Thanks for the fun 🤩

[@kennyrmurray]

Tony like I’ve said in the past and I’m sure most of your viewers would agree with me because most of us here like to learn is don’t worry about the people that don’t like the long videos. I personally love when you get into the schematics and explain how and why the circuits work. If I’m working in my garage and don’t have time to sit and watch I still play your videos to listen to them. I have replayed videos from when you fist started. Since I have a terrible memory at my older age it’s like I’m watching it for the first time lol. Those that don’t like the longer videos have a FF button. We don’t have a “fill in the missing schematic explanation” button. Thank you again! I still have a lot to learn.

[@danielmelendrez1616]

Amazing project. Watching this while designing a pretty coplex PCB on KiCAD. Please tell me that you paid 5 bucks for this sad amp.... :( Cheers to you Tony!

[@richb419]

It looks like someone was parting the amp out.

[@Joetechlincolns]

Look up test equipment or ham radio gear on E-bay, the same salvage yard tactics will be found. Part-outs make more money than selling equipment as complete. Salvage yard tactics. Great vid Tony. Another piece of history is back in service.

[@Transistorfanatic]

Love you Videos' Tony !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I have learned a lot from you Best regards John

[@hestheMaster]

Somebody went snippety- snip -snip to it. Don't you just love a challenge? I see Tony does. Amazing work man.

[@andymouse]

One hour of top drawer engineering...cheers

[@gregjohnson5194]

Very nice work. What a great repair job, most people seeing that thing having all wires cut would probably pass but you handled excellently. 👍

[@danielgumm421]

Thank you so much. I love the passion to make the circuit and see if you could duplicate it. So fortunate you had that circuit board, for sure. I learned a lot and loved the video. You encouraged me to recoup my old Pioneer receiver that also had some neglect

[@alanlefevere3678]

Excellent work Tony really enjoy your videos.

[@karllangeveld6449]

Nice video, good ‘detective’ work. You’re a brave man.

[@TrevorsBench]

Great work Tony, sometimes the detective work is the most rewarding part of the job

[@dhpbear2]

7:42 - As I always say, "Why blow a perfectly good fuse?" :)

[@atw4321]

Nice job bringing it back to life and saving it from junk pile

[@andymouse]

It takes a great deal of skill to design a circuit that will self destruct in order to save the fuses🤣....cheers.

[@tamtgirl]

i don't remember you saying what the short was that took out the resistors

[@xraytonyb]

I never really found the cause of the short. I suspect it had something to do with the indicator lights or the "missing" circuit board that controlled them. The security board operated on the 18.5 volt supply, but that would not explain why the resistor for the negative 18.5 supply was also opened. We may never know....

[@Scott.Newmaster]

"SpongeBob Square pants". Ha ha, you know your audience........ It ok, I'll take my A.D.D medication now......

[@nedzadramovic5151]

Bravo good man, i dont know whats happends with my NAD -3080 Ampflier. I think problem is bad connection from my computer. Also i clean my Technics Ampflier from 1977 SE 9200 , plastic on one button falls appart in pieces.Time made his own. 35 years.

[@ripjones5294]

I sold Setton @ Franklin Music in Atlanta. This would have been in the late 70s - 1980. They all had a very polished look. I think Pierre Cardin was the designer of "the Look". The owner of the company, was the lead importer for Pioneer at the time, and wanted his own brand in the marketplace. As a matter of fact, some of Pioneer's electronic designers, actually designed some of the actual electronics. A pretty amazing story. On eBay, the people auctioning off Setton gear, tend to believe they are worth more than they actually are. There are not a lot of units out there, so parts are somewhat hard to come by. I would like to have a Setton piece in my collection, but I am not willing to spend, what some selers are asking. Kind of like the Marantz Tax. Enjoyed the episode.

[@sonnylou8087]

I got a Telya Tony, you got a rename that amplifier to Frankenstein, including right down to the schematic diagrams😂😂👍👌🏽 what an impressive repair job I tell you I am impressed.

[@cskeet1320]

Hi Tony, thanks for all your videos. They are invaluable to hobbyist repairers like me. It seems that everything I repair, you have a viodeo on it!. This video was certainly a KZbin classic. Great job. So much to learn from sharing your huge expeience. I am currently restoring one of these amps, but I have a problem. This service manual description of adjusting the bias current seems to suggest that the left channel is set at 30 mA and the right at 70 mA Surely this can't be correct. Is this a misprint? Did you notice this? You didn't mentioin bias adjustment in your video. Did you work out what the bias currenyt should be for left and right channels?

[@xraytonyb]

Most likely a misprint. Set them both to 30mA and check for distortion. If it performs well, you should be good!

[@cskeet1320]

Hi Tony, Thanks very much for your reply. Very helpful .I actually found a French forum post (had to translate) which confirms what you suggest. This amp really sounds great. Just to add to the intrigue of the amp... The security PCB is present in my unit. It is the same as the PCB in the service manual and as you suspected the right hand section is not populated. The protection and heat bulbs were blown. (Operate bulb works). I replaced them and they just blew again. On checking the board one of the tracks to get he unpopulated section has been cut and a wire link has been added from the base of Q5 to pin 11. This doesn't seem to make any sense. Also the PCB silk screen printing of Q7 does not correspond to the orientation of Q7 and the PCB tracks/ connections have differences to the schematic that don't make sense! Very confusing. I'm not sure if it came out of the factory like this and has never functioned properly or if someone has messed with it. Anyway, I think I just need reverse engineer the security board from the schematic and build a new PCB like you did. Frustrating as I actually have the original PCB. Do you still have a copy of the schematic that you designed?

[@randyr.parker2698]

I'm not an electrical engineer, but I did stay at a Holiday Inn Express last night! LOL 😂 Seriously though, NICE job on the re-manufacture/re-engineering of the missing board, I wish I knew just a fraction of what you do Tony! I can usually follow along and understand it as you're talking us through what's going on, but being able to take a schematic and understand what the original design was supposed to do, I'd be lost, maybe someday I will. 😉 Great video! 👏

[@crmixman]

You did an amazing job resurrecting this amp! Just a labor of love. I have an RS-220 with a bias issue that I'll tackle in the next few months. Looking at the two service manuals, I see it uses the same boards.

[@steverhenius6734]

Thanks for sharing, Tony. I found it instructive and will help with confidence and enjoyment in my own repairs :-)

[@joegennaro8265]

Hi I love watching your videos I've learnt a lot you must have used all your brain cells to fix this one you are a very clever man I would like to ask you a question where can I get schematics for Samsung TVs I have an old LED Samsung TV if you could help it would be wonderful hope you bring more repair videos like the one you've just done it is very informative thank you my name is Joe and I live in England

[@johnnytoobad7785]

I think Beavis owned that amp and he got frustrated with it after it "smoked". So he cut it all to pieces. "Wires suck...there's too many of 'em..."

[@TheTrueVoiceOfReason]

Takes me at least 4 hours to drive to my "local" Radio Shack. Probably close to about the same for you. It's in Allenport on Rt 22in the middle of PA.. Yep, spent much of my misbegotten youth in the local "Shack" - actually started as a Lafayette store. Oof. Now I feel old. 😁

[@ianforfun1]

Yes, dastardly deeds indeed on this one and the evidence do suggest Sweeny Todd cuts! What a handsome fellow at first glance and not know a Setton A1100 amplifier has a slight look of a cool smooth 1970s Rotel. It seems obvious that in this case, Sweeny Todd had attention deficit hyperactivity disorder. What a great video listening to the outro music had a kind of tube sound. I listen to KZbin with Hi-Fi speakers that also serve as bench speakers.

[@nabman_]

Awesome work. Your way of explaining is excellent. Thanks for the education.

[@brucebuckeye]

Thoroughly enjoyed this Tony! I felt like I bellied up to the workbench at your side. Thanks for having me along. Someday I might make it to your level! Today, if it was me, I would have trashed that tha minute! minute! You are amazing sir! And I don't think you even cussed once!

[@jesiscott6048]

That was delightful! And evocative of an amplifier I restored that a customer found in pieces on the roadside. We must be crazy, don't you think?🙂

[@danielross868]

Very well done Tony. You have tremendous skill with a lot of knowledge... It does sound good at my end, very nice amp/ receiver. Would look even better with a nice wooden box ;) Cheers

[@timhull8664]

Blimey Tony, if you ever have a fire, make sure you have a decent extinguisher.. that backdrop was high risk.

[@radio-ged4626]

Sweeney Todd or angry/jealous partner? Either way this made for a great fault finding video. Thoroughly enjoyed it, thank you.

[@leearft8605]

Absolutely excellent troubleshooting episode Tony! Thank you very much for this kind of content, seeing the process is priceless!

[@johnnytoobad7785]

This is the most ambitious repair/re-build I've EVER seen on U-tube. Great analysis, video editing and narrations.

[@craigm.9070]

Thanks for that resurrection journey. As for the amateurish wire cutting, it makes a guy want to say, "The nerve of some people's kids!"

[@ashleycox432]

Outstanding work. It never fails to amaze me what people do to stuff, but I'm even more amazed that you turned this one around. Great work.

[@davidbradford8542]

I did my apprenticeship In the late seventies early eighties, so I have a soft spot for this type of equipment. I still think the quality of build is better then todays. These were the days when you could call up the manufactures and get straight through to a engineer and speak engineer to engineer (or Technician to Technician depending how you labelled yourself we were always known as service engineers and I still do) Ps great content nice to see how repairs should be done, anybody can change a chip it's knowing why that chip is a fault and being able to do the measurements to prove that chip is as fault.

[@allensheldon90]

Awesome video! That top to the capacitor you found (looked to be off one of the filter caps), it doesn’t affect the performance of the cap - just cosmetic I assume?

[@linandy1]

Aww rats, I thought this was the actual Sweeney Todd's amplifier 😀

[@scytales2548]

I sure enjoyed it. Congratulations for this thoughtful and clean work !

[@ossianhaufe4671]

OMG, the soul of Sweeney Todd came out of this amplifier…..do you have a knife 😬❓

[@pedrocavasos100]

I have a Carver m500 I picked up at a goodwill but it also was a slasher victim can't find anyone that will repair it

[@rafacq]

Wow! You certainly know your science! Congratulations.

[@the8bitbarn836]

Tony, This amp looks like it was used as a parts car if you will. They cut out the parts they needed and tossed back in the pieces they didn't. Seems sad it looks like shell of what used to be something great. People are foolish!

[@DJ-Way]

Exactly what I thought The tube may be in breach of contract They expect it is too difficult for creators to band together

[@RectifiedMetals]

Thanks for this video. It shows how important to make the repair before any other work. Nicely done.

[@pglick123]

That was a really nice save!

[@unclefrogy743]

I agree your guess that maybe the seller tried to parts it out is correct the reason you got it as a "whole amp" is he had no takers and did not want to wait around. That or it was recovered by a scraper who then tried to sell it whole as is instead of scraping it out. I got a bunch of "crap" like that all without any service documents existent.

[@johndost3087]

Great job Tony. One of your best videos! Thanks.

[@ElektrikaCo]

Tony vs the Chopper… finally met the final boss after beating all those grim tweakers!

[@26Jorgeb]

That takes a lot of intelligent analysis to do what you did.That's a lot harder than a saturday stumper!!!!

[@michaelwolak3098]

Excellent job Toni I knew you had it in you to repair this amp

[@charlesabura472]

Excellent electronic detective work - thumbs up to you

[@Homer19521]

Make sure you give that Ebay seller a 👍. 😏 Great job, Tony.

[@19janiboy96]

Props to you tony. Restoring vintage amplifiers got boring for you I guess :D

[@garygranato9164]

thank you for the video tony, and for all the trouble shooting tips and tricks :)

[@gordthor5351]

I am getting what you are saying. Basically, a euphemism for having an attention span of a gnat.

[@apollorobb]

Talk about something sad i had a Sansui G-22000 that had its amplifier COMPLETELY disassembled sent to me about 6 month ago to put back together . That was a P.I.T.A luckily the Receiver was in good shape. I still to this day cant fathom why any Moron would completely disassemble stuff like that .

[@josephcote6120]

Great rescue. I don't know that I would have been brave enough to try.

[@borayurt66]

Incredible work as always. I would have said "nah, pass..." if I were the one to see the insides. You are a better man than I am. One quick question, you kept calling it a "receiver", is it just a slip of the tongue, or is there a reason for it? And note on the Sponge Bob fans, if their attention span is limited to 11 minutes, they shouldn't follow channels that do their repair/restoration works in real time while providing a ton of useful info. There are quite a few channels that show similar contents with sped up or time lapsed videos accompanied by entertaining music.

[@xraytonyb]

Total slip of the tongue. I'm always calling integrated amp receivers (and tuners receivers as well). I asked the doctor why and he said I have a condition called A-G-E ;))

[@adalbertus777]

@@xraytonyb No worries Tony, it's not a serious one. I think your condition translates to: Amplifiers, Gears, Etc :)

[@randyr.parker2698]

@@xraytonyb 😂🎯

[@borayurt66]

@@xraytonyb I have the same condition, manifested after 50. 🙂

[@johnb5519]

That was great. It certainly fell into the right hands.

[@blankschematics3277]

looked more like someone has taken it to the high street butcher, than the barber...

[@paulsto6516]

Experience oozes from your fingertips.

[@markhod1960]

Tony, I enjoy your channel very much I have a question for you at where did you Get that gooseneck light work light from 😊

[@xraytonyb]

Ikea

[@marcodoria]

Great job as always Tony! Cheers!

[@Digital-Dan]

One, two, three times through the grinder . . . 🙂

[@hoobsgroove]

Well done Tony that was an interesting project is it going back on eBay for trouble the price lol where are they made US?

[@xraytonyb]

I will probably give it to one of my Patrons.

[@timhull8664]

Sounds just like youtube!😂