pete_mac Posted June 22, 2020 Share Posted June 22, 2020 (edited) 49 minutes ago, Southie Adam said: Does this have the Tamura transformer? Good question... the X-1111 was manufactured with both the older type of transformer and the newer Tamura transformer. @Sansui77 shine a torch through the slots in the top cover and let us know! EDIT: from what I can tell (and I still have some serial number searching to do!) it looks like the 88-89 build models are the conventional transformer, and the post-1990 models are the Tamura. This makes sense as the 907DR was released in 1990 and featured the Tamura transformer. It's also worth noting that both the 907DR and AU-X1111 were available in 100V JDM and 230V Euro versions which was a first for the top-line Alpha generation of amps. I've also seen some serial numbers on the 1111 indicating they were manufactured in 1992 which is very interesting! Edited June 22, 2020 by pete_mac Link to comment Share on other sites More sharing options...
muon* Posted June 22, 2020 Share Posted June 22, 2020 Some drool worthy amps! Makes me want a Sansui Link to comment Share on other sites More sharing options...
pete_mac Posted June 22, 2020 Share Posted June 22, 2020 (edited) On 21/06/2020 at 6:56 PM, Sansui77 said: Would love to come up to a Sansui gtg and meet all you guys in person at some stage when this con19 is all done and dusted. So what list do we currently have between us all? It's a great list AU-111 907 NRA 907 Limited AU-1111 MOS Vintage @Cafad @pete_mac B/C2302 907 DR 907 MR 907 XR 607 NRA II Did I miss a model? Anyone with a AU-X1 or II? There's a 907i and 907KX to add to that list - along with a 607MRX and AU-X711 (same amp stage as Cafad's 911DG but no digital stage). What a bloody impressive list it is! Dad also has the B/C2102 combo which pre-dates the alphas but basically the pre-power version of the AU-G99X amp and is x-balanced. Edited June 22, 2020 by pete_mac 3 Link to comment Share on other sites More sharing options...
Sansui77 Posted June 22, 2020 Author Share Posted June 22, 2020 (edited) 2 hours ago, pete_mac said: Good question... the X-1111 was manufactured with both the older type of transformer and the newer Tamura transformer. @Sansui77 shine a torch through the slots in the top cover and let us know! EDIT: from what I can tell (and I still have some serial number searching to do!) it looks like the 88-89 build models are the conventional transformer, and the post-1990 models are the Tamura. This makes sense as the 907DR was released in 1990 and featured the Tamura transformer. It's also worth noting that both the 907DR and AU-X1111 were available in 100V JDM and 230V Euro versions which was a first for the top-line Alpha generation of amps. I've also seen some serial numbers on the 1111 indicating they were manufactured in 1992 which is very interesting! No, mine is not the Tamura version. I was actually looking for the Tamura version but by the time you pay the 37kg fee from Japan, it wasn't worth it. Franco Cozzo gave me a great deal on this one The Tamura version 1111MV sells for a higher price in Japan because it's rare and it was a shorter production run with the new model / 907DR coming into release as well. I wouldn't think there would be much difference in the SQ department. Remember, the top B23XX power amps use the same conventional type transformers. Edited June 22, 2020 by Sansui77 2 Link to comment Share on other sites More sharing options...
pete_mac Posted June 22, 2020 Share Posted June 22, 2020 Just now, Sansui77 said: The Tamura version goes for much of a higher price in Japan because it's rare and it was a shorter production run with the new model / 907DR coming into release as well. I wouldn't think there would be much difference in the SQ department. Remember, the top B23XX power amps use the same conventional type transformers. Oh yes, I agree. Sansui have always used excellent transformers - Tamura or otherwise. It's a non-issue IMHO. 2 Link to comment Share on other sites More sharing options...
Sansui77 Posted June 22, 2020 Author Share Posted June 22, 2020 B23XX power amp AU-1111MV They look similar in their layout configuration don't they? 1 Link to comment Share on other sites More sharing options...
pete_mac Posted June 22, 2020 Share Posted June 22, 2020 12 minutes ago, Sansui77 said: B23XX power amp AU-1111MV They look similar in their layout configuration don't they? They do indeed! The later power amps like the B-2103 and B-2105 are even closer! AU-X1111MOS AU-X1111MOS with Tamura: B-2105: 1 1 Link to comment Share on other sites More sharing options...
Sansui77 Posted June 22, 2020 Author Share Posted June 22, 2020 That's unbelievable Pete...... There's 10 years between the two and they look 95% identical in their layouts. Obviously the newer B2105 had the newer design - tighter torrance components fitted but WOW. 1 Link to comment Share on other sites More sharing options...
pete_mac Posted June 22, 2020 Share Posted June 22, 2020 56 minutes ago, Sansui77 said: That's unbelievable Pete...... There's 10 years between the two and they look 95% identical in their layouts. Obviously the newer B2105 had the newer design - tighter torrance components fitted but WOW. They are certainly close - the B2103 circuit appears to be an evolution of the X1111MOS. The B2103 is slightly simplified in some areas, with much greater use of the RIKEN resistors and the use of more U-Con black polypropylene caps and not so many of the copper foil styrene caps. AU-X1111MOS: B-2103: 2 Link to comment Share on other sites More sharing options...
Sansui77 Posted June 22, 2020 Author Share Posted June 22, 2020 (edited) 24 minutes ago, pete_mac said: They are certainly close - the B2103 circuit appears to be an evolution of the X1111MOS. The B2103 is slightly simplified in some areas, with much greater use of the RIKEN resistors and the use of more U-Con black polypropylene caps and not so many of the copper foil styrene caps. AU-X1111MOS: B-2103: With upgraded circuit components, they look identical Pete. Why change something that works well. Edited June 22, 2020 by Sansui77 Link to comment Share on other sites More sharing options...
Sansui77 Posted June 22, 2020 Author Share Posted June 22, 2020 (edited) New review hopefully soon. Edited June 22, 2020 by Sansui77 2 Link to comment Share on other sites More sharing options...
pete_mac Posted June 22, 2020 Share Posted June 22, 2020 18 minutes ago, Sansui77 said: With upgraded circuit components, they look identical Pete. Why change something that works well. Very close, but not identical - they certainly changed the circuit over the years. Nothing too drastic though! Much like the 907s, Sansui pursued a philosophy of evolution rather than revolution. 1 Link to comment Share on other sites More sharing options...
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