Sansui au knobs

Sansui au knobs. org community and broader web Mar 26, 2022 · The metal knobs on pots and rotary controls were fitted on the AU/TU-517 and up, with all lower models getting the plastic knobs. The early G series Sansui Receivers represent the pinnacle of 1970's receiver design. Oct 25, 2008 · Oct 25, 2008. Here's a newbie question for y'all. $16. Brand New. Not every one of them has this problem so I suspect it is due to some change made during production, or it has the problem but it didn't get caught in early production runs. 025%THD, and the frequency response of the power amp section at 1W is 0 to 200 khz +0/-3db. FOR SALE: Sansui 9500 knobs kit. I just bought a completely restored mint condition AU-719 and it arrived today. Looks like a very solid built machine and, considering the stated 20W/Ch output, has plenty of punch. I used Panasonic, Nichicon (UPW and UKT Series) and WIMA film caps. Knobs for AU-X701, used. Nice piece sir, All the usual suspects apply, the switches need serious cleaning or you will have channel dropouts, especially the connected separated switch. See details. $649. Buy It Now +C $24. none missing. Greeting Audiophiles, Finished recapping, (total recap) the AU-2900. 2. Hi Echo. Well done on the trouble free completion of the recap :thmbsp: the AU-888 is a particularly nice Sansui amplifier. Transformer, ‘Power supply’ Transformer 40022329 (North American version) - $45. Watch Report This Ad. There are knobs for AU-777 and AU-999 in the market but they are different, (two stop screws). View cart for details. The lubrication in the shaft has gummed up. sansui AU-999…control knobs. Issues like bad soldering and corrosive glue are here in spades. Switch 4 and 6 (marked with rectangles in the attached sketch) are the parts in the unit. The tone board was a little difficult to get to but I did it by removing the front chassis (front part). Given that the AU11000 weighs 19 Kg (42 lb), I would say you about right, except that it did weigh five times more. 61. It had some crackling on some of the volume/balance knobs and some outings. The balance knob has minor scratches on the face of the dial. SANSUI AU-777 SERVICE MANUAL INC SCHEM ENGLISH SOLID STATE ST CONTROL AMPLIFIER . Sponsored. Payment method: This Sansui AU-9500 Integrated Amp is in excellent condition throughout and shows very minor wear from use and handling. Probably because they are few years younger and collectors are not looking for them yet. View similar gear from other sellers on Reverb. music (55,986) 100%. If I turn the volume control up high and mess with the muting switch the sound will return to normal. In design, appearance and performance, the amplifier draws heavily on the careful engineering that has made Sansui's larger AU amplifiers, favourites among stereo enthusiasts throughout the world. Documentation generated during my journey to rebuild this classic integrated amplifer with the help of the Audiokarma. Tape in/out for tape recording or Equalizer connections. Hi, I'm new to this forum. US $5. 94. Item #649612840. Shop now for fast shipping and easy returns! Jul 5, 2020 · So i've got inherited sansui au-555 from my uncle and tryin to restore it, And now been a while lookin for the 4 middle knobs,but it seem bit difficult. Treble, bass tone controls, loudness, earphones jack. or Best Offer 5 New Sansui Lever Knobs for AU-555A, AU-666, AU-888 Amplifier Toggle Switch. Info: Sansui AU 717 and AU 519 Volume Knobs. When I was growing up, my Dad used to have this great punchy little Sansui amp in the living room, I believe it was a Sansui AU-217 II, or one of the very similar models. Oct 23, 2007 · The other lights on the selectors are red. This amp comes with 3 months warranty. I would like to build a new chassis/plinth for both pieces and would like to make several design changes to the Amp. $88. Yes, I know wiggling the volume pot brings it back on. Of course it was listed as working perfectly, but it is far from it. Nov 29, 2023 · Set screws are in the knob. Au919. Being young, they are very reliable, no need to replace anything. The Sansui AU-555 integrated amp is the heart ans soul of my system. The same knob is used on the Sansui AU-555 and maybe AU-222 as well (spline axel without stop-screws) I've been looking for the knobs for a long time but without success. See also: Service Manual. Buy It Now. The lubrication in the body of the control is gummed up. It is very clean inside and all the glue has been removed from the boards. can anyone tell me where i can get this fixed? i live in central virginia. Nov 5, 2012 · It does not have the selectable tone control rollover frequencies that the 717 features, but is most other ways it is very close to its brother. The AU-717 amplifier incorporates an advanced design feature which has extremely low inherent transient intermodulation distortion enabling negative feedback (necessary in traditional amplifier design but undesirable) to be reduced to the absolute minimum. This particular volume pot was encountered by my father and I when we were asked Feb 7, 2014 · Sansui AU- 505, fails right channel. 4 Separation of Preamplifier and Power Amplifier. The price is for one piece. Capacitors, ‘Power supply filter’ cap, Nichicon 2200uf, 60719. Buy Volume Knob for Sansui AU-D907 Limited. The AU-555A is an upgraded model of the AU-555, featuring refined dull black panels and the exclusive triple tone controls. Sansui AU-719 Integrated Amplifier Parting Out Bass Treble Speaker Knob #4. The Sansui AU-7700 is the largest and rarest of Sansui's Silver Knob AU-XX00 series. Asking Price: CAD $ 35. Very strange that eBay selling them so cheap. Has always functioned since I obtained in late 70s. Sent from United States. Aug 16, 2010 · Aug 16, 2010. #14. Old capacitors, dirty switches and potentiometers, carbonized relay contacts, crusty adjustment trimmers, messy wave The AU-20000 was the biggest integrated amp that Sansui ever made, and is a true work of art from a sonic and industrial design perspective. For instance, this year I sold on eBay Sansui AU-999 (only 50wpc) for 3 times Sansui Au-11000 Stereo Amplifier Operational. Pre-Owned. Dec 13, 2002. Shipped in padded envelope with signature confirmation. $10. Jul 3, 2015 · I don't think any of the AU-999 specific mods are applicable here. Power amplifier design too, shows a departure from tradition resulting in Oct 31, 2023 · The AU-517 is a very good amp, basically a smaller wattage version of the classic AU-717. AU-717. The receiver pushes out 40 watts of clean power per channel. As far as cleaning, I can't say I'm familiar with the type of volume pot used in the 317. You can separate the main and pre by taking out the jumpers then connect your phone directly to the main in with RCA cable. I have an AU-6900 which is giving me problems. $145. Apart from that, I have one and it is every bit as good as a top of the line Japanese amplifier of the 1970s should be. This model has been serviced to excellent working condition, with all original levers and dials. i'm looking for help with my sansui au-717. Thread starter fbarquier; Start date Feb 6, 2014; fbarquier The knobs and levers I have cleaned 2 times with DeoxIT + faderLube. The recap seems to have solved my issues with the amplifier popping and hissing after a few minutes of use, however I still have issues with the sound. If it you have good audio you know it is not (immedietly) the power section. Find top brands, exclusive offers, and unbeatable prices on eBay. I'm thinking the issue is the volume control though. Some of them had knobs with plastic inserts that pull on and off the splined control shafts. From a collector's perspective, this is one Sansui's three kings. If you want to compare them to other makes, you need to choose models from the late 1970s. Save up to 5% when you buy more. So buy some Tri-Flo or Dupont silicone oil with Teflon. 25 (approx. Mar 25, 2015 · Mar 25, 2015. My brother thought he tested it, and that the volume control was "scratchy" probably only needing some deox. None missing. love. -. I enjoy working on this machine but, I have discovered some oddities which I want to share Nov 8, 2020 · Nov 8, 2020. Hey guys, I'm in the middle of cleaning the controls on my au-717 hoping it will fix an issue I'm having. sansui AU-999 or TU-999…. The plastic film that shipped with it brand new is still on the chrome sides of the face plate; see photos for details. The AU-505 is a solid state performer that belongs at the head of it’s class. Transistors, ‘Output / power amp transistor’ STK 014, - $35. Au 517: Au519. I purchased a Sansui Au-222 parting out unit for restauration. Some worn paint. Jun 30, 2019 · For me it would likely take upwards of $5k to find an integrated that I'd enjoy as much as a AU-717. I actually ran the cleaner for a lot longer than I usually do and some of the black paint on the AU-70 knobs (in the tiny slot, indicating dial position), came off. Not to forget that the diamond differential stage was what enabled Sansui to get there fast outputstage and was used from the au 919 up to there last X-balanced alpha amplifiers. Aluminum Potentiometer Knob for Sansui amplifier AU 9500, NOS, one piece. The 717 can be tricky. 3 Speaker Connections. Only 1 left! Consolidated documentation of a Sansui AU-717 integrated amplifier rebuild. The power supply board will need attention as those caps are held captive and tend to deteriorate over time. I have began by cleaning the mechanical parts, front face and knobs, and the chasis. Voltage 100/117/220/240 Volts: 50/60HzPower: 90 WattsWill consider shipping, but all shipping costs will need to be paid by Buyer. Rated power output is 65W per channel into 8 ohms 20hz to 20khz at less than 0. This amp was made between 1970 and 1973. Jul 9, 2012 · New Member. 2 lb with 100 WPC into 8 ohms and THD of less than 0. Opens in a new window or tab. Does anyone knows which kind of sansui knobs could match as replacement?or is there somebody who want to sell their no longer used au-555 knobs? Yes! Many of the sansui knobs, sold by the shops on Etsy, qualify for included shipping, such as: Vintage Drawer Pull Ceramic knob Store display board by Ajax Hardware store; Replacement parts: harman kardon hk440 vxi stereo receiver knob; Sansui SP 2500 Speaker Stands made of Solid Walnut; Limited Sansui 9090 DB Stereo Vintage Receiver Enamel Pin Nov 7, 2020 · Scored a Sansui AU-555 in somewhat decent cosmetic shape. I just purchased a Sansui AU 70 Amp and a Sansui SR 838 turntable as my first foray into tubes and vinyl. from United States. Top Rated Seller stevegalgiani (7,788) 99. Plus there's the fact that the matching Sansui TU-717 tuner is a very nice item as well. Sansui, AU-a907 - 1986 - Integrated Amplifier - 180 watts per Channel!!! Used – Good. #15. Aug 3, 2013 · These Sansui AU-D7 (80wpc) and AU-D9 (95wpc) are very undervalued. Sansui AU-719 Stereo Integrated Amplifier Parting Out Balance Knob Mint! C $40. See all pictures. Watch this gear and we'll notify you if it becomes available again. Jul 6, 2012 · Just to show the difference with the au517 and the similarity with the au919 the schematic of the head-amp/control board. Dec 14, 2015 · Sansui Au -222 Switch Wiring Diagram Hi, read this post and try to get an answer for fix my Sansui Au-222 amplifier. Fully tested and 100% functional. C $27. Nov 16, 2023 · Original knobs for speakers, bass, treble , balance and REC selectors Parting out , no refunds Sansui AU- D11 original black knobs (set of 5) - Parting Out | eBay Skip to main content SANSUI 331, SANSUI STEREO RECEIVER PARTS / SPARES. May 11, 2012. Aug 17, 2021 · Visit site. Jan 15, 2023 · SOLD - FOR SALE: Sansui 9500 knobs kit. 2 Connection. Oct 23, 2014 · But I decided to write only now. It has upgraded higher end speaker binding posts and a furutech audio grade IEC input 5 New Sansui Lever Knobs for AU-555A, AU-666, AU-888 Amplifier Toggle Switch. From our perspective, the AU20K is the most stunning Sansui piece all around. All set screws are in knobs. bentpencil said: Turn it on and wait until it drops the channel again. WANTED: Sansui AU 717 and AU 519 Volume Knobs . 8%. So that said even if the AU-717 needed a "full on" restore it's a pretty safe bet it would still be less expensive. 56 shipping. Jul 23, 2019 · - however the Sansui group on here don't make a habit of creating BOM's as they tend to be applicable only to a limited (sometimes very limited) number of same model units. The phono section does use transistors but the two top level inputs and the tuner are all tube. $795. My brother picked up a Sansui AU-G77X integrated amp off of CL for me. The cabinet on this piece has a couple of scuff marks, but Oct 23, 2007 · The Sansui AU-919 came in a couple of slightly different configurations. 29. 99. 714584546seven Sansui Au D7 Integrated Amplifier - electronics - by owner - sale - craigslist Aug 7, 2016 · I feel the most accurate amplifiers and the Sansui's I enjoy the most are the G series receivers, particularly the G9000 and G22000, this "flavor" of sound would cross over to the AU717, 919 and the AU-X1, AU-D11ii and the likes, I find the older Sansui amps a bit "coloured" for my liking, and amps like the AU9500 are a bit bloated sounding SANSUI AU - α 607 dr. Dec 14, 2020 · It is most probably coming from failing capacitors or transistors in the Main amp or in the Pre-amp or in both. Heat Sink, ‘Power amp’ heat sink (less transistor) - $25. Balance Aluminum Knob for Sansui amplifier AU-D907 Limited, maybe it could be good for some other Sansui units please check all pictures to be sure. The AU 919 (year 1979) weighs in at 47. i managed to unscrew hex unfortunately the volume knob is still stuck fast!!! need help in removing the knob urgently for a restoration. Anyone can help me and thanks in advance! Eddie EDDIEMIU, Dec 6, 2005 #1 . peace. Sansui AU-999 Knob - For Volume, Balance, Mode, Speakers, Source Selector Switch. The 1000A is a tube receiver is known for its big and powerful sound. the volume knob is VERY loose but the knob will not come off even with the set screw out and the only way i get sound out of it is if i jiggle the knob. 5 Unit's Power Amplifier. Feb 23, 2024 · This lever cover/knob fits: power switch, balance check, HI/LO filter, and tuner switch…incorrect knob for mode/tape function. Dec 13, 2002 · Super Member. I believe both types are metal (Aluminium) knobs. Jun 22, 2020 · Rule out which part of the amp is having the issue. Just try it anyway. Jan 25, 2006 · From 1973 to 1975, Sansui introduced slew of high end amplifiers, such as the Definition Series; CA-2000, CA-3000, BA-1000, BA-2000, BA-3000, and BA-5000 as well as the famous Professional Series AU-9900, AU-11000, and AU-20000. Inputs are 2X Phono (turntable), 2X auxiliary, & Tape inputs, amounting to 3 line level inputs for your iPod, CD player, computer or TV audio. from May 28, 2018 · Last year, I found a cosmetically rough Sansui AU-9900. Feb 25, 2013 · Hello! The bass knob on my Sansui AU-717 is loose. . The volume on my AU-517 starts from 0 when the dial is fully rotated in the counterclockwise direction (even though the highest Db value is printed at that position) and then goes up steadily as the dial is rotated clockwise up to the half way point where the volume maxes out and then starts Apr 25, 2008 · Apr 25, 2008. Dec 7, 2005 · Looking for Sansui AU-70 Schematic and a Balance knobs( on the left side of the panel). Info: Sansui 9500 knobs kit. </p> Sansui AU-11000. Mar 6, 2023 · The AU-719 built on Sansui's popular AU-717, adding advances from the AU-919, like incredibly high frequency response and extremely low distortion. 5mm or 2mm Allen head set screw. I am in the process of restoring a nice Sansui AU-505 amplifier that is in very good condition (however some fine scratches present). Replaced dead speaker fuse and nervously turned the variac voltage up; voltages looked good; no obvious/exploded bad parts to be found. Plastic knobs were also fitted on all matching accessories like the AX-7, MA-7, RA-900 and AT-15L. Do it All switches/knobs have been cleaned to ensure reliable and crackle free operation. Apr 18, 2010 · New Member. Add to that the outstanding quality of the engraved fascia, the superb feel of the switches Selector Aluminum Knob for Sansui amplifier AU-D907 Limited, maybe it could be good for some other Sansui units please check all pictures to be sure. Basically I would streamline the look by eliminating switches, tone controls, headphone jack Apr 22, 2021 · SANSUI 5317880 BASS TREBLE SPEAKERS BALANCE KNOB AU-4900 AU-3900 INT AMPLIFIER. So, it functions but is imprecise, meaning there is too much play when moving it. Meanwhile I got the lost three of the 5 toggle switches to complete the unit. The amplifier circuit of the amplifier is independent from the ground circuit, and an epoch-making advanced α -X balance circuit equipped with NM-LAPT is adopted. Breathe easy. Build quality seems better on the 919 and it too has a great phono section but, I must note, that on transition from the AU 717 to the AU 919 knobs had gone from machined aluminum to plastic. 73)Standard postage. 30-day returns. When it's playing the left channel sound will drop out. The AU-517 pot is a multi-segment ALPS pot and disassembly and repair is tricky, but achievable if you're patient and careful! This info may not apply depending upon the exact issue, but it shows what the internals of the 517 volume pot are like. The sound is cleaner, crispier and Rare Monster Sansui QRX-7001 Stereo / Quad Amplifier, 1976, Recapped, Superb, $1099 Shipped! Sansui QRX 7500, Monster Amp, Serviced, Recapped, Best Price On Reverb, Superb, $1475 Shipped! SANSUI AU-X1 HI-FI INTEGRATED AMPLIFIER RARE VINTAGE HIGH END PHONO SERVICED. It is most likely the lubrication in the shaft. By maintaining the image of those high end amplifiers, Sansui introduced the more affordable amplifiers in this 1 Table of Contents. This pre-main amplifier has a simple body and is completed with SANSUI technology. Sansui QRX 7500, Monster Amp, Serviced, Recapped, Best Price On Reverb, Superb, $1475 Shipped! Sansui Au-20000 Integrated amp. Feb 24, 2014 · There are 2 possibilities: 1. 95. Description. They both share the same service manual, so they are not that much different, but the 717 is the top model in that series, and I believe the AU-717 is close to being the best selling model that Sansui ever produced when it was made in 1977-78, when Sansui was at its peak, before quality cost-cutting took May 11, 2012 · Old Uncle Thingy. All the caps have been replaced including the large 12000 uf caps. Volume Aluminum Knob for Sansui amplifier AU-D907 Limited, maybe it could be good for some other Sansui units please check all pictures to be sure. Seller pays for return postage. Add to Cart. Dec 3, 2015 · Used the ultrasonic cleaner on the knobs (and some AU-222 knobs). 05 price drop. The AU-11000A has some different boards to the AU-11000, and slightly different internal layout. Remove the knob and slowly inject the oil into the juncture of the shaft and the body of the control. No recent testing performed. I gave the switches a clean and the 'dead' channel came alive after giving the tape/tuner paddle Apr 8, 2007 · Location: Cleveland, Ohio. C $45. You may also like. #1 - Bypass the tone section and plug in a source into the power in. Luckily I have a good friend who has a lathe, so I drew up a power button and he turned up one out of Delrin I was able to find a donor pot with a long shaft, and had a bush turned up on the lathe as well . Aug 27, 2018. Aug 17, 2021. themanualarchiver (1,307) 100%. Great cosmetics, works great no problem or issues whatsoever and no static noises as knobs turning. The other version has smooth control shafts and the knobs are held on with set screws. I’ve been getting to know it, and despite its missing a few knobs, it sounds great! And I really like the controls. It operates on 120v for the USA market. i got this with a tu-717 tuner from the original May 6, 2018 · Description. Nov 21, 2015 · Nov 30, 2015. It suffers from many of the same issues that similar amplifiers of this era do. $19. Explore a wide range of our Sansui Au 7900 Knob selection. The AU-719 could be considered a more powerful AU-717 with better frequency response and less distortion, but with less makeup. Sounds very nice now! The problem: Jan 29, 2017 · 1) A thin lube that plays well with others. Volume, Speaker, Balance, Mode, and Source | eBay This is the rarest version of the Sansui AU-111 - a Series I model, with those tell-tale unique two-tone knobs. If that helps, do the contact cleaner bit to it. Feb 3, 2024 · Sansui AU-9900 mode/source knob. #1. This knob will fit all TU-999 flip switches. Apr 23, 2010. Original Paper Service Manual for Sansui D-M7 Cassette Tape Deck Tone Control Aluminum Knob for Sansui amplifier AU-D907 Limited, maybe it could be good for some other Sansui units please check all pictures to be sure. AU $7. No other integrated amplifier in it’s class can touch Sansui’s AU-505 for tonal quality, versatility, ease of operation and Sansui AU-6600 Stereo Amplifier, Vintage mid-70s, Brushed Black Finish with Silver Knobs. Fully Restored Lafayette LR-400 Stereo AM/FM/MPX All Tube Receiver & Matching Lafayette Speakers! Sansui AU-7900 rebuild restoration recap service kit fix repair filter capacitor. ¥ 87,000 (released in 1991) Commentary. The AU-X1 has a reputation for being unstable; it oscillates and blows the output transistors which are unobtainium. Oct 18, 2023 · These are the larger knobs on the front panel. "Click" on the picture to get picture in bigger resolution. Anyway, it had this rather wonderful "feeling" volume knob that was slightly notched, meaning it would almost click slightly when you turned it. 2) the amp will have to stand up on its rear so that the volume pot shaft is vertical for gravity and capillary action to distribute the lubricant. When the volume control knob is turned all the way to the left, off, I still get sound from the left channel. cheers. 00 shipping. - $30. Mar 30, 2023 · The AU-717 will require a fairly straightforward, yet comprehensive restoration. Overall in very nice condition, very few imperfections, front panel seems very lightly used, and the back panel Jan 2, 2017 · Jan 2, 2017. It has a warm sound and is amazingly powerful for the 20W mentioned on the Service manual. Apr 25, 2009 · EchoWars said: The knob should be attached with a 1. 04. These will fit the Sansui AU-2900, AU-3900, AU-4900, AU-5900, AU-6900, AU-7900, and AU-8900. Buy Apr 26, 2024 · Up for sale a nice clean Sansui au d7. Fast and reliable. There are no shortcuts, it needs to be done right. 3) Applying a little heat (as suggested in another thread) definitely helps move the lube along the shaft. Volume Knob for Sansui amplifier AU-D907 Limited. Like many 70s receivers, this amplifier produces a sweet, low-distortion sound perfect for any Hi-Fi setup. They are black except the rims are silver. thanks. Jan 21, 2021 · Feb 28, 2021. Kentwood, MI, United States. #2. Stereo integrated amplifier, alloy knobs, metalcase. You will find that all the Japanese manufactures of that era evolved from what was considered a "warm" tube like sound to something more precise. Some information about this two-channel integrated Aug 27, 2018 · Active Member. $20. 6 Specifications. Includes hex set screw. It has arrived in my hands via Hyperion, who gave it a full re-working and got it well up to spec whilst it was in his possession. It does not exhibit the dirty volume control traits. Price Drop. Something went wrong. and. Gave it a nice cleaning/lubing inside and out. All fused resistors gone no question. The one arrived dead in one channel and weak in the other. Before switching on the receiver reduce the volume of your phone to minimum. The A revision added bias adjustment for the 7591A output tubes. I am absolutely enamoured with the sound of this thing - I'm hearing new things in every record I play. audi*quattro (660) 100%. SOLD. Hello, I just wanted to share my impressions of my recently acquired AU-9900. 008 %. With the volume off and the balance knob turned all the way to the right I still get sound from the left channel , although lower in volume. Speaker connections facilitate bare wire. Jul 8, 2012. Free returns. It powers on, and sounds lovely - with that characteristic “Sansui warmth”. $175. I own a AU-717, AU-719 and AU-919, which I rate in that order. I have owned this amp since the mid '90s and ny father bought new in 1970 before he married. Jun 14, 2014 · Here are the results of my first AU-505 rebuild. See listings for other Sansui AU-9900 knobs. Check out our sansui volume knob selection for the very best in unique or custom, handmade pieces from our stereos & home audio shops. One of those is the classic Sansui 1000A. Today, someone brought me a cosmetically nice Pioneer SA-9500! At first, all I got was noise even with volume turned down low. Download this manual. If you have two spare knobs, please contact me! Find many great new & used options and get the best deals for SANSUI AU 717 Amplifier volume KNOB at the best online prices at eBay! Free shipping for many products! Aug 2, 2013 · Aug 2, 2013. I have to say that it has made A BIG DIFFERENCE. Aug 7, 2020 · Hello, I have a Sansui AU-222 that I just finished a recap on, first time trying to restore an amplifier and so far so good. So in the future I will just do a light ultrasonic (which I've never had trouble with before). Cassette decks were a mixed bag, lower models having plastic knobs, upper models getting metal. As for the knobs - patience and ebay are your friends. Then, wiggle the connect/disconnect switch on the back of the unit. Assuming something simply needs to be tightened, how would I go about doing this? I've opened up the system to clean some things but at the time, did not Jan 2, 2011 · A new knob was obtained from a place that specialise in NOS Sansui parts. Apr 6, 2024 · These are beautiful brushed-aluminum knob covers and look amazing. Jul 31, 2023 · These are not compatible with the 5050 to 9090 series. 00. Item #649940571. This is a non-code project focused on documentation, methods, tools, and parts needed to revitalize a Sansui AU-717. #5. vw zo hj hl ql qu fo ya kq hm