Sansui Alpha AU-907MR (Audio Engineering Perfection)

In this video we look over one of the last and greatest amplifiers ever made by Sansui before they left the market. Engineering perfection...

[@rogervd666gamer]

What a great vintage amp is this. But believe me, I'm 54 years jong and also a vintage audio lover but your journey in audio land will never be over 😂

[@whatcouldgowrong7914]

Im planning to check into HIFI rehab soon 🤣

[@romannowak5169]

I highly recommend the amplifiers. I have Sansui B - 2102 MOS VINTAGE and I am enchanted. best amp I've ever had. something amazing

[@johnedwards8819]

Congratulations on owning one of Sansui’s finest amplifiers! A suggestion - when you remove the amplifier modules, check the larger capacitors for glue issues, and it may be prudent to remove any glue that is present as this will eventually corrode anything it comes into contact with. I have “been inside” several 907 Limited amps and this glue was present. And I wouldn’t consider redoing the heatsink compound or changing over to “silpads”, just check the tightness of the mounting/securing screws. My son and I have several “AU-Alphas” and they are simply Sansui at its best!!!

[@whatcouldgowrong7914]

Ah yes I forgot to mention the glue… Don’t think it’s an issue on this one from what I could peek but yes will address it if needed. Will see about the thermal compound when I get in there, approaching 30yrs old now, I do have concerns about it drying out though… 😊

[@romannowak5169]

I have Sansui B - 2102 MOS VINTAGE and I am enchanted. best amp I've ever had. something amazing

[@lonl2119]

I have the Alpha AU-607MR(X) - X is the European 220/220V Version. I`m totally satisfied with the incredible controlled sound, especially the "amp direct" connect. I have also one of the biggest Sansui Amps, the AU-X 1111 mosVintage, a really fascinating and beautiful 36kg amp, but the alpha`s models are my personal favourites.

[@whatcouldgowrong7914]

There is currently an X1111 MOS Vintage for sale locally that is very tempting but also very expensive

[@nickvanr.8584]

i have the european alpha au 607 mrx , the best amp ever made

[@nabilzien7105]

Stunning amplifier I have one beautiful sound indeed love it

[@whatcouldgowrong7914]

It sure is! Another video next week addressing some things :)

[@petemac1109]

Congrats - it's great to see another 907MR in Australia! I have a few 907s including the MR, XR, KX, DR and L Extra (plus three of the 607s) and they are beasts. The XR and MR are the creme de la creme though! I agree with you logic of not changing the Silmic Alpha Super Gold capacitors unless absolutely required - these things are constructed to a different standard than the 'garden variety' Silmic IIs and are enormous, and installing Silmic IIs would be a backwards step. The pedant in me notes that they are spelled and pronounced Sil"MIC" as opposed to Sil"MAC" :)

[@whatcouldgowrong7914]

For some reason I always has Silmac in my head 🤣

[@TheThatoneguy12121]

Those binding posts look to be WBT of Germany and they make very high quality ones like those that can be costly. My Onkyo Integra A-929 have them. Looking forward to more videos on this unit!

[@whatcouldgowrong7914]

Just looked it up, nice spotting! “For the speaker terminal, OFC alloy 24-carat hardening gold plated terminal made by WB Germany”

[@TheThatoneguy12121]

@@whatcouldgowrong7914 Yep! You can't miss em. Once you see em, you just know! I believe around the neck or ring of the post it says their name inside the clear plastic.

[@Hi-Fi_Surgery]

The best series amplifiers back in the days, and still one of the best that can compete with just any modern amplifier, repaired about 300 of them and personally i also own 907MR

[@whatcouldgowrong7914]

Amazing that you have seen so many! I look forward to seeing another one day, had my eyes on an older model but hasn’t been looked after with a broken headphone socket which is disappointing…

[@Hi-Fi_Surgery]

@@whatcouldgowrong7914 they all look similiar in internal built, but differ in details such as number of blue Riken resistors and topology of the differential input, 907MR is most universal

[@maheshp802]

@Mr1Raziel Between 907MR or AU-X111MV (MOS Vintage) and 907NRA - which one is better to choose?

[@Hi-Fi_Surgery]

@@maheshp802 i would take MR

[@danhorton6182]

That looks a lot like my Kyrocera A-910 I just did, with the driver boards and heatsinks flipped. I’m guessing the 4 trimmers on each board are to dial in the positive rail, negative rail, bias, and offset. Nice integrated.

[@petemac1109]

The Sansui Alpha X-balanced amps like the 907MR are complex beasts with a 'floating ground' design and sophisticated circuit design throughout. Truly high-end stuff. The schematics reveal all - there's a "+" and "-" amp stage per channel with one bias and offset trimmer for each of these amp stages, hence two bias and offset timmers for each channel.

[@trevor245]

Looking at just how much is in here it's kinda insane that you can buy this amp from japan for 'only' around 1500 usd. Sure after importing and shipping you'd be at like 2000 but you gotta imagine it would have cost close to that just to make!

[@whatcouldgowrong7914]

I paid quite a bit for this pristine example but yes I agree, modern enough rival the best new amps on the market while having the engineering excess, cost is no object of times past… I used to think audio peaked in the 70s before the decline of the 80s but how wrong I was…

[@MrRonnmaui]

Really a beast! Does it sound as good as a Luxman L100?

[@whatcouldgowrong7914]

Haven’t heard an L100 sorry but its the best amplifier in my collection so far :)

[@pawcioo3508]

kzbin.info/www/bejne/aHzaaIKEg5ukeq8 mamy w Polsce specjalist od Sansui :) , w filmikach pokazał procesy renowacji tych wzmaków .Zadowolony klient :)

[@michaelmityok1001]

How much?

[@whatcouldgowrong7914]

Not for sale but it came to around $2000USD shipped. A relative bargain for what it is...

[@michaelmityok1001]

You mean people send you amps to fix and you video fixing them?

[@whatcouldgowrong7914]

These are just amplifiers coming into my collection and learning from because they interest me / video content. I don’t generally work on other gear as no one would pay the cost of a full restoration.

[@michaelmityok1001]

@@whatcouldgowrong7914 so you restore then keep as a pure hobby without intention of selling? just curious, on average, how much are full restorations if you add 20% markup not including hourly labor? also how do you know for sure you couldn't recoup cost + 20%?

[@whatcouldgowrong7914]

@@michaelmityok1001 I have done work for others when I feel good about their intentions but rarely. I do sell them when it’s time to move them on or something better comes in like this Sansui. I couldn’t even guess what the cost would be as 90% of technicians just do patch repairs. I have probably 15hrs into this unit going over everything and that isn’t even a full rebuild.

[@nicholasdagias1673]

Hi there, how do I contact you to discuss repair of a Sharp RP-207 turntable? please DM me your contact details

[@whatcouldgowrong7914]

You would be best to find someone local as I couldn’t modify another one in any way that would be cost effective. The video’s make it look straightforward but it was a lot of work…

[@pjlett5688]

This is not even close to the best of Anything ,good in its day.

[@Hi-Fi_Surgery]

Best back in the days, one of the best today. Period

[@whatcouldgowrong7914]

For its price, I don’t think anything can touch it build quality wise these days :)

[@robertdavis5714]

Really, 33 kg...............Tank. Now I know why I have never seen before. Copper back plate very nice. Well, there is the weight, GIANT TRANSFORMER. No, I think those feet are machined Copper.