Sansui AU 719 Bad Power Transformer
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- Опубліковано 16 лип 2023
- Replacing a crispy power transformer in a vintage Sansui stereo integrated amplifier. This is a dual mono design where one of the transformers went bad, and show the replacement procedure.
Good information about black flag capacitors:
www.conradhoffman.com/BF_caps...
I still have an AU 717 and a TU 717 that I bought in the states in 1978 and I also have an AU 919 that I bought in 1981 while stationed in Japan in the military. At the time, almost everything was dirt cheap there. I no longer use them, but cosmetically they are mint. Being an electronic tech, I'll probably go through them at some point, but I'll never get rid of them. They are pretty amazing sounding.
I bought my gear in 1978 while on the sunny isle of Okinawa. Sansui BA-2000, CA-2000, and a TU-717 tuner. I figure I paid about half of stateside prices at that time. Still took every penny of a corporals pay! The amps still work great. The tuner needs a bit of work.
Hey Ray, just stumbled upon your channel recently. I love your attitude and your insight into the world of audio repair and restoration. As a tech who has seen terrible repairs done left right and center myself, it’s great to see another tech take pride in their work and share their experience with others. Keep up the great work and videos! Cheers
Connor
Connor! What a coincidence; I was just looking through your AU-717 restoration thread on AK this morning.
You've got a great channel and skills to match! Nice to see you here.
love your videos ray, i dont have electrical engineering background whatsoever but the way u honestly tell that sometimes you made mistake boost my confidence to diy my amp project
I don't have an engineering background either.
Humans make mistakes. In the US, it's estimated that 30% of deaths are due to medical errors. And these are highly educated people.
So, remember that you are doing this at your own risk, but having said that, find something expendable and dig in. You've got to start somewhere!
I watch every video that you put out. I have 2 amps that need you. A Onkyo M504 and a DBX BX-3. I wish I could send them to you
BTW, I am a big fan of you videos.
@@johnpuso4085 Thanks John! While I would love to help you with your amps, I'm still working full time despite the fact that I'm pushing 70, mostly by choice. But it does limit my spare time.
@@raygianelli3612 thanks for replying back to me. Can't believe you are pushing 70. Keep up the good work and I will continue to watch. Great videos. I was an electronics tech in the Navy and understand what you are doing but I don't have the test equipment .
I did not know about Black Flag Caps = Good info = Thanks!
I didn't either. I found out by reading a popular audio forum.
Thanks for your post; it reminded me that I forgot to update the description field with Conrad's black flag page.
Going to be following along as i have my 719 on the bench also it also needs rebuilt....also another Glenn here lol
Glenn, stay tuned. I'll be tearing into this on my next day off.
If you have any suggestions or questions please post them!
Great video Ray, as always. I am still laughing thinking about what you named Susan . The lazy one that is :)
Yeah, I always thought Susan's got a bum rap there, whereas I know EXACTLY what a lazy bastard I am. 😁
Keep up the good work ray. ❤❤
Thanks, I plan to!
When I played guitar, distortion was my friend. Now it's my enemy. 😁
Great video!!!
Thanks Salvador!
Apparently you and I have a similar sense of humor. I'm still chuckling about the Manhattan Project joke!
That said, I occasionally offend people when I don't mean to.
you rock! and love your channel :)
Thanks Danny! I always loved fixing things, and music as well. So this has been a real blast, learning all kinds of new things. Gotta keep the brain active as you get older!
Ray .... As I often have to admit ...
I never make the same mistake twice, I'm just too busy making new ones.
Stuff happens.
Thanks Douglas. It just seems like I make it happen more than it should!
@@raygianelli3612
Naaa ... it happens to the best of us.
I'm currently working on a class-d power amp project. I just discovered the boards I'd chosen have a bad problem with cheap output coils. Now I'm off on a hunt for better boards...
Stuff just happens, my friend.
Ray, thanks for another great video, especially the info on the black flag capactors. I'm always surpred by how impactful a dirty volume pot or dirty controls can be to the operation of an amplifier. That volume control was the worst I think I've seen.
Thanks Jeff!
What was so surprising about the volume control is that it's sealed, and it was the first one of those that needed cleaning.
Dirty switches and pots can cause all kinds of havoc, and have fooled me more than once.
@@raygianelli3612 Ray, I've restored many AU-717 amps with similar Alps pots and most of them were scratchy with some dropouts, but most would pass full signal when exercised. The one thing in those models that could cause channels to drop out was the switch on the back. Normally, exercising that switch makes the problem go away, but I normally disassemble and clean the contacts.
@@jefftobin4034 Yeah, those switches are real troublemakers. I've probably done more 717's than any other amp, as I bought 4 broken and took in a few for repair and rebuild. They're great amps when refreshed!
Bonjour from france!
Great video!
I do have the same transformer problem on the same amplifier! Do you have any tips to find them? Do you know an equivalent model?
For whatever reason these amplifiers have transformers that fail. Unfortunately, the only source is from amps being parted out. So the only options are eBay, or find a company that rewinds transformers.
And bonjour from the US!
Hola , una pregunta cuánto debe ser la graduación de vías del au719 por las salidas de cornetas
¿Podría reformular su pregunta, por favor? Google Translate me está decepcionando aquí. 😁
Tem um diodo tipo 1n4148 ligado na linha de saída de áudio. Qual é a função dele no circuito..
Não tenho certeza de qual diodo você está se referindo. Se estiver no vídeo, você poderia me dizer a hora em que aparece?
@@raygianelli3612 É no au-519 ele é bem parecido com esse modelo. Na linha de saída de áudio tem um ponto de ligação que leva pra esse diodo, onde vai pro circuito de transistores que fica na entrada de sinal de áudio..
Obrigado pela gentileza de responder..
Styrene does not belong in an amp.