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Found 2 results

  1. I've just finished a restoration of a lovely, near mint example of a Sansui AU-888 which is quite a rare amp indeed! The AU-888 is a slight revision of the AU-999 with some minor circuit tweaks here and there, a new front faceplate design and 5WPC less than the AU-999. One important point of difference between the 888 and 999 is that the chassis of the 888 doesn't have the large hole beneath the filter capacitors which enables the installation of my favourite Nichicon Super Through filter caps. Unfortunately we've had to retain original-spec caps here (albeit a very clean set out of a MINT AU-999 which are in fantastic condition). The original caps were bypassed with small 1.5uf polypropylene caps. This particular example had a fault in one channel which was rectified by the Sansui Grand Poobah (skippy124) and I then set out the restoration path. I didn't get too many 'before' pics, but the amp was as you'd expect with a layer of dust and crud inside: And some after pics. In addition to the usual suspects (Nichicon HE, Panasonic FC/FM/FR, Elna Silmic II and Nichcon ES bipolar) I used some Nichicon KL and Kemet low-noise/low-leakage caps in certain signal path locations. The amp certainly sounds great afterwards! All of the notorious 'flying saucer' transistors were replaced with modern equivalents. The original power cable has started to deteriorate, with the copper oxidising and the plastic dielectric oozing some kind of liquid. A replacement AUS cable and heavy duty cable gland was fitted. Bias adjustment time! Time for final assembly, cleaning and detailing. The front face was unmarked but a bit grotty, so it was thoroughly cleaned. Each knob was removed, detailed and refitted. The timber veneer cover was treated with Gilly Stephenson's timber product. The result is superb - it's a lovely looking bit of kit and in magnificent condition - as good as any Sansui I've ever worked on or seen. Who doesn't like polished output transistors? One really important detail on an amp in this kind of cosmetic condition is the metal plate over the voltage adjustment cover. It has a plastic protective layer installed in the factory, and it discolours, stretches and looks plain nasty over time. Once this is removed and all sticky goo cleaned off carefully, it looks a million bucks and is in keeping with the overall condition of the amp. Sooooo... how does it sound? Well, without having a restored AU-999 here to compare it to, I'm going by memory only. That said, I think it sounds fantastic and would be very, very hard to pick any difference between this and the AU-999. If anything, the 888 may juuuuuust nudge ahead...
  2. Hello there, first of all sorry for my english. I heve sign in to this forum seeking help. 3 months ago my Sansui AU-888 right chanel has burned...most of transistors went down. I menaged to replace components with equals or similar replacements, still i stoped on bias mesurment/adjusting mA and mV. I hoped member "skippy124" with his large experiance could help me...sending instructions where to plug in multi-meter to mesure mA, i poses shematic but "plug + to 2 and - to B1" is just black magic for me. Things i have done so far: Inserted right quick acting fuses Replaced burned 1Kom resistor (same for left channel to keep them "same", as new resistors have +/-5% and old one have +/-10% tolerance) Changed all caps to Phanasonic for Audio, nichicon fine gold/fine grade, mkt, Elna for Audio, same capacity exept for main filter caps, few are bipolars as schematics sugest etc. Changed VR regulation pot's to new ones (i heared old's are preety bad) Switched voltage selector from 220 to 230 (right value in my "country", i know voltage varies +/-10% but i wanted to be on the safe side) As all right chanel transistors burned and infamous "flying sourcers" ware present i decided to change them all: 2SC281 -> 2N3904 ....(in service manual there is 2SC984 but mine had 2SC281) SC1111 -> C1402 2SC680 -> 2SC5171 2SA566 -> 2SA1930 CDC 8002 -> 2SC5171 CDC 9002 -> 2SA1930 Are transistors right choices? in the future, what to insert in place of XA-495G ? transistors whare choosen from bunch to mach hFe, are mounted on silicon thermopads and most with handcrafted "radiators" ("to be on the safe side") now i need specific photos and instructions other than from unclear (for me) manual where to plug multimeter to set proper mA (is it in place of pulled out fuse? F003/F004) mV mesurment is clear. also is "minimal counterclockwise" = "turn to the right as far as possible" ? If no one help me i will be forced to give this amp to some spec...problem is i spend most of my money reserves already =( Link to two photos, shematics, datasheet of transistors and service manual: http://www.mediafire...iokncl6stku6cou Regards and thanks in advance.
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