GeoKost
Well-Known Member
Kevin, glad to hear you got the bass mod going. I anxiously wait to see the new thread.
George.
AU-999 Mystery components and power switch quesions
- Thread starter DCinDC
- Start date
Kevin, glad to hear you got the bass mod going. I anxiously wait to see the new thread.
George.
I think yes. I've cutted the two blue wire of each channel and connected togheter. nothing else.
Yes, I've read it and I'll do it..
Ahhhhhh. Now I understand how it works! It' a news for me
Great mod! I can think of make also this mod, after the pre-amp mod.
Yes... at 99% THANKS!
Few questions again..
1. I have to recap all or there are some caps that are not so important
2. I will have some benefits increasing the capacity of the two main caps? (up to 6800uf or more, keeping 50v)
3. there is the risk that all of those mods can modify the original sound in terms of warmess and personality, bringing it towards to more modern ampli?
many thanks again!
ciao
Rug
kevzep
Its all about the Music
1. If you are going to re-cap it, you might as well do the whole thing while you are in there.
2. I have BHC 80V 10,000µf caps in mine, I also put a bigger bridge rectifier in mine to handle the start up "in-rush" current.
3. No, mine has all new caps, new bridge rectifier, all new transistors, and its sounds great!!
you cant change the basic sound of the amplifier, the design is what makes the sound, not the specific components....
mikeinit
Something Profound
I have finished recapping, all transistors, this mod, the headroom mod, the larger main caps, and rectifier. I have a bright bulb on my tester, so am going through and found some waste in haste mistakes.
I am just wondering on this mod if I remove the board altogether, was it correct to connect the shield wires together? before they were together, but were then going to ground from the board anchor screw. Now as it is they are not going to ground. I am excited to be this far, and am going to be patient so as not to see that magic smoke.
I am just wondering on this mod if I remove the board altogether, was it correct to connect the shield wires together? before they were together, but were then going to ground from the board anchor screw. Now as it is they are not going to ground. I am excited to be this far, and am going to be patient so as not to see that magic smoke.
mikeinit
Something Profound
Thanks for the answer. Will do.
I'm not sure how far I will get tonight.
Time flies when...
Jpdspin
Member
I'M so Happy
Little story about my Sansui AU 999. When I was a kid, I had the chance to have pretty good sound system at home and a great vinyl collection. the passion had hit me again 5 years ago, when a saw for the first time a Sansui AU 6900.I bougth the baby and it sounded great. than I started to buy and to listen to other brand; Marantz, luxman, akai, sanyo, etc...so I became a great fan of Sansui brand. I felled in love with the Sansui AU 999 and After 1 year I finaly got a great deal for the Sansui AU 999 and TU 999, 400$. The tuner still add the plastic film on hit. They were in great shape. Probably not the same years of production because the tuner has the gold front on the pots rather than black and the face plate of the AU 999 has a purple reflect in the black.
In the second part of my little story you're going to understand wy I'M SO HAPPY.
SO I bring back my Sansui duo home, I was very excited. Put the beast on small speaker to test, ok to go on the HPM 60. Call my girlfriend to come for a sound check:yes:
After 5 min. She tell's me {Hum I think I like more the AU 6900} I was thinking exactly the same, but I didn't tell her. I was disappointed:sigh:I said to my self, I have to run the thing couple of days.
I've decided to make a music listenning test with couples of friends and 6 different amp and guest what! My super Sansui AU 999 was last:tears:
So I started reading more and more on the 999, then I decided to bring it to a Passion audio friend to recap-it. It did change the sound for better but still no BAssssssssss! and squeezed. I was strating to think that it was the colour of that amp, is personality. I said to my self I can't change the amp but I can change the speakers, soI found a nice pair of Celestion Ditton 44. Restore them, new crossover, new cables plug, new cables, new solder. Finded the right spot to bring out the bass in my music room but still, was not the Nirvana:dammit: I have a pair of B&W dm100 on the AU 999 to.
I still have 5 system and the one that I love the most is my Sansui AU 999 but that's not the one, who sound better. I decided to take it as it is and forget about the Bass. It's a difficult thing to do.
And than, three weeks ago, my friend who recaped my Sansui sent me the lynk for your thread. I was so so happy, it was Christmas
I read the thread on the subsonic filter and said to my gilfriend that there was finally a solution for the bass, so I open the amp all excited and:sigh: nothing there, no filter in that amp!
Came back to the article and found the Mod of MR Kevzep:lmao: I'm waithing for the resistors, should be in next week to do the mod. I will keep you in touch.
Thank you so much to all of you.
I'M SO HAPPY
sorry for my english writing. It's not my first language.
Jpdspin.:thmbsp:
Little story about my Sansui AU 999. When I was a kid, I had the chance to have pretty good sound system at home and a great vinyl collection. the passion had hit me again 5 years ago, when a saw for the first time a Sansui AU 6900.I bougth the baby and it sounded great. than I started to buy and to listen to other brand; Marantz, luxman, akai, sanyo, etc...so I became a great fan of Sansui brand. I felled in love with the Sansui AU 999 and After 1 year I finaly got a great deal for the Sansui AU 999 and TU 999, 400$. The tuner still add the plastic film on hit. They were in great shape. Probably not the same years of production because the tuner has the gold front on the pots rather than black and the face plate of the AU 999 has a purple reflect in the black.
In the second part of my little story you're going to understand wy I'M SO HAPPY.
SO I bring back my Sansui duo home, I was very excited. Put the beast on small speaker to test, ok to go on the HPM 60. Call my girlfriend to come for a sound check:yes:
After 5 min. She tell's me {Hum I think I like more the AU 6900} I was thinking exactly the same, but I didn't tell her. I was disappointed:sigh:I said to my self, I have to run the thing couple of days.
I've decided to make a music listenning test with couples of friends and 6 different amp and guest what! My super Sansui AU 999 was last:tears:
So I started reading more and more on the 999, then I decided to bring it to a Passion audio friend to recap-it. It did change the sound for better but still no BAssssssssss! and squeezed. I was strating to think that it was the colour of that amp, is personality. I said to my self I can't change the amp but I can change the speakers, soI found a nice pair of Celestion Ditton 44. Restore them, new crossover, new cables plug, new cables, new solder. Finded the right spot to bring out the bass in my music room but still, was not the Nirvana:dammit: I have a pair of B&W dm100 on the AU 999 to.
I still have 5 system and the one that I love the most is my Sansui AU 999 but that's not the one, who sound better. I decided to take it as it is and forget about the Bass. It's a difficult thing to do.
And than, three weeks ago, my friend who recaped my Sansui sent me the lynk for your thread. I was so so happy, it was Christmas
I read the thread on the subsonic filter and said to my gilfriend that there was finally a solution for the bass, so I open the amp all excited and:sigh: nothing there, no filter in that amp!
Came back to the article and found the Mod of MR Kevzep:lmao: I'm waithing for the resistors, should be in next week to do the mod. I will keep you in touch.
Thank you so much to all of you.
I'M SO HAPPY
sorry for my english writing. It's not my first language.
Jpdspin.:thmbsp:
Last edited:
tobyj17
Comfortably Numb
The reason why a lot of us have decided to remove it is because if it detects a short, it will short out the amp, and blow the fuses. This could cause more than just blown fuses. It could wreck transistors and such. It has no affect on sound.
Jpdspin
Member
Well you're right, it happen to me once. I had my Sansui au999 and my 6900 on an amp spliter. By mistake I've push the wrong button and blew the 999 and the 6900 was ok.
That was before the restauration on the 999.
I'm not a pro DIY so if someone know a article or a link on how to remove the speackers protection bord and what part number, it would be nice. I have the manuel but i'm not sure wich part it is.
Thank you.
I blew my amp once,I don't want to do it again.
Jpdspin.
That was before the restauration on the 999.
I'm not a pro DIY so if someone know a article or a link on how to remove the speackers protection bord and what part number, it would be nice. I have the manuel but i'm not sure wich part it is.
Thank you.
I blew my amp once,I don't want to do it again.
Jpdspin.
Jpdspin
Member
In the Manuel, I have the ref: F:1334 SP protector Bloc. Should be it. that's what they call the Crowbar if I refer to Tobyj17 and GeoKost picture« Kicking off my AU-999 Project»
I've found where I did saw the infos. It was in the same post.
Sorry for that.
Quote: DCinDC
yep
just remove the board and cut the ground (black) and speaker wires (blue and grey
And Quote: Tobyj17
Hey Mike,
To remove the crowbar just snip the three wires off if it. BUT, when you do, snip them back by the fuse sockets instead of the board. This way you don't have wires going to nothing, waiting to short out on something.
I will remove the protectiom board at the same tim that i do the KevZep Mod, When I will receive my resistors.
Jpdspin.
I've found where I did saw the infos. It was in the same post.
Sorry for that.
Quote: DCinDC
yep
just remove the board and cut the ground (black) and speaker wires (blue and grey
And Quote: Tobyj17
Hey Mike,
To remove the crowbar just snip the three wires off if it. BUT, when you do, snip them back by the fuse sockets instead of the board. This way you don't have wires going to nothing, waiting to short out on something.
I will remove the protectiom board at the same tim that i do the KevZep Mod, When I will receive my resistors.
Jpdspin.
gagelle
Super Member
This is very interesting. I always learn something from DCs posts.
The bottom link on the AU-999 page gives the better (cleaner) schematic.
Last edited:
What is the "Born on Date' on your model?
The reason I asked is because mine is also a '72 model and does not have the subsonic filter.
bolero
Super Member
ah....well I guess one could figure out when they stopped using it, by referencing that serial # database
they started building/selling the AU 9500 only a few months later, I would assume they were doing R&D on the 999 & and carried over the improvements to the new model. Which, from what I understand, is a similar amp but with some adjustments
what is the month of your build?
they started building/selling the AU 9500 only a few months later, I would assume they were doing R&D on the 999 & and carried over the improvements to the new model. Which, from what I understand, is a similar amp but with some adjustments
what is the month of your build?