Sansui AU 719 Stereo Integrated Amplifier Initial Evaluation and Restoration
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- เผยแพร่เมื่อ 1 ต.ค. 2024
- Evaluation prior to starting restoration of this vintage stereo integrated amplifier. Identification of issues and their repair is covered here.
ray you have such a good way of teaching how to fix things and help me a lot in the process tk for that.
Thanks Wilfredo! Many people helped me along the way, and now it's time to pass it on.
How about video on au717 volume control and pinout
I totally agree. Check everything first for problems. Not all the owners are able to identify/notice possible malfunctions. Certain faults, moreover, are only visible with the appropriate instrumentation. In your case, hum presence could have induced to point the finger to bad capacitors. As you well showed there was a more serious problem. Great job so far!
You're so right about test equipment showing issues that wouldn't be seen/heard. High frequency oscillation is a prime example.
That distortion analyzer I have has shown me problems I never knew I had.
Thanks for sharing your knowledge!
Appreciate! It's the only way technicians can reproduce. 😁
Great Video Ray.. Thank You
Thanks for watchin! I'll try to keep them coming, but life/work etc can get in the way.
@@raygianelli3612 Completely understand… :)
i did not know that a shorted transistor in the power supply could create hum until i found one in my nad 2140. that thing had several bad caps, 'lytics and ceramics causing hum and each bad one that i found reduced the hum enough to find the next failed part. once i got it under control, i replaced every cap regardless of the type. that amp is now about the quietest amp that i have. :) thanks for the video ray👍
Yeah, it was a revelation the first time I saw it.
I guess amplifiers are more than just a collection of capacitors, as some seem to believe. Who knew? 😝
@@raygianelli3612 😂
Nice one Ray ! very useful.....cheers.
Thanks Andy. Nice to see you again!
P.S. Don't show those mouse ears around here. The governor has it in for Disney. 😁
@@raygianelli3612 Don't we all lol!
Well done!
Thanks man. Good to see you around!
Tips = Re: Bending cap pin = Research wire bending tools that are used to make jewelry. You do not need a precision set. Hobby Lobby is a good/cheap source. "Loop" pliers are particularly good for bending pins, without putting any pressure on the component, itself. No more cracked ceramic dip caps, at the pin/ceramic junction. I also use my flat bill pliers very often, to straighten pins, or to make bends. When I was a sound tech in the 70's, we trained our ears to readily identify the Hertz of a tone. This made it easy to identify feedback and to pull it out with an equalizer. Just giving back to the Community that likes giving back to the Community, as you say. grin.
I'll have to look into those tools. Thanks for the tip!
I used to play guitar in bar bands. Used to work with a singer who had the bad habit of holding his mic down by his side when not singing/talking. Right by the stage monitor. He could never figure out why we had such bad feedback issues. I ended up patching a Behringer Feedback Destroyer into his mic insert. I'd have to reset the filters when we took a break, they all be active!
Excellent work, I was just going crazy with the buzzing that afflicts my Sansui Au717 concentrating on the filters but now maybe you have directed me on the right path. Thank you very much
While filter caps are often the cause of humming or buzzing they are not the only cause. It's one of those issues that using an oscilloscope will help to diagnose. Carefully probe each of the regulated supplies and you may well find the issue.
Happy hunting!
Are you up for restoring another AU719? Ray
Ray, I'm still working through my backlog, and really can't take anything in at the present time.
For future reference, where are you located?
@@raygianelli3612 good morning Ray. I am located in London.
Many Thanks
Ray
@@raysmith8307 Ray, send me an email from my About page, and I will give you contact information on a gentleman in Hertfordshire who specializes in Sansui.
Thanks Ray, as ever, very informative with a clear and logical approach to diagnosis. As ever, I learnt something and enjoyed it, regards Kevin
Thanks Kevin! I had to learn the hard way that a haphazard approach will burn you sooner than later.
Thanks Ray - another great learning video for me. BTW, love the shirt at the end of the video!
The "Birds Aren't Real" shirt? I love the idea of a satirical conspiracy theory!
Hello Ray, you are providing best advices !
Thanks Roro.
At least I'm smart enough to listen to your advice!
Thanks Ray!! Another awesome vid!
Appreciated, Charles! Only ankle deep in this one so far. 😁
Excellent vid Ray, thanks!
Thanks Peter! Got one or two more on this one before moving on to the next adventure.
I do the same thing with electros - bending one leg to fit the hole spacing. I did it so it looked pretty! Thanks for highlighting the REAL reason!
Another reason,anyway. Because pretty helps sales!
@@raygianelli3612 Yes! Bud Light is testament to that :-)
I always learn something from your videos! Thanks for sharing your wisdom.
Thanks Bill!
My definition of wisdom is experience that's been beaten into you by life. 😁
@@raygianelli3612 I can buy that, but I have always said wisdom is the proper application of knowledge.
@@bill_p2074 Fair enough!
I enjoyed it!!! And learn too!
That's what I like to hear. Learning should never stop.