McIntosh-MC-75-C22-Tone-Audio 电路图 维修手册.pdf

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1、R E V I E W ISSUE 22. 2009 Anniversary Classics from McIntosh t is amazing how things come full circle. The first true high-end system to which I was exposed as a 14 year old was right down the street at my pal Garth Riveras house. His dad was an ex-military officer and while many servicemen were br

2、inging home Japanese gear to start their systems, Garths dad was pro-American. He had a tricked-out McIntosh system built right into the wall in their living room featuring a C22 preamp front and center along with a McIntosh tuner and Thorens turntable with SME arm and Shure M91ED cartridge. A pair

3、of Dynaco Mark III amplifiers were placed under the floor boards feeding the Jantzen floorstanding speakers with electrostatic tweeters and 15-inch woofers. It was one of the tidiest HiFi installations I would see for years to come. But that summer was the year that I discovered Miles Davis, Robin T

4、rower and Pink Floyd, usually at fairly high vol- ume, as his dad really liked to rock out. Whenever I heard that system blasting, I would hop on my bike and zoom down the street. There was always something great play- ing on the turntable. Now with McIntoshs 60th anni- versary C22 and matching MC75

5、 mono- block power amplifiers, you can go home again. By Jeff Dorgay I RadioFans.CN 收音机爱 好者资料库 R E V I E W 2009 Printed with permission from TONEAudio. A Remake That is an Honor to the Original In celebration of McIntoshs 60th anniversary, they have decided to release an updated version of that lege

6、ndary preamplifier. Unlike the Commemo- rative Version that was sold in 1995, with a differ- ent tube complement from the original design, the new version is back to the originals configuration of six 12AX7 tubes. There is also a matching pair of MC75 tube power amplifiers that feature triple- plate

7、d gold-colored titanium stainless steel. The 60th Anniversary McIntosh amplifiers and preampli- fier are only sold as a set for $15,000, which is not a bad price for a great vacuum-tube preamp with MM and MC capability and a pair of 75-watt tube mono- blocks, especially with this level of exclusivit

8、y. There are only going to be 120 sets built for North America (60 for the US and 60 for Canada), along with 60 sets each for worldwide territories. When I visited the McIntosh factory in March, I was able to see the final units being built and shipped all over the world. The various McIntosh dealer

9、s had already purchased all 60 sets for the US market, but as CEO Charlie Randall told me, “All of the dealer units havent been sold to customers yet, so we should get the word out on how great this set is.” (continued) “All of the dealer units havent been sold to customers yet, so we should get the

10、 word out on how great this set is.” RadioFans.CN 收音机爱 好者资料库 R E V I E W 2009 Printed with permission from TONEAudio. And great they are, but Im getting ahead of myself. If you are a car enthusiast, you know that a few classics have been brought back with mixed success. The new Dodge Challenger is b

11、y far my favorite current classic because it combines all of the styling cues we remember, it gives a slightly modern aesthetic, and it offers more performance than the original. The owner of the original can look at the current version and not want to take a hammer to it, while owners of the new mo

12、del can look back on the original and still feel pride of ownership. I think McIntosh has achieved aesthetic perfection with the current issue C22 as well: its just the right balance of classic Mac with subtle updates. The MC 75s are awesome too, but the gold finish will either be for you or not. It

13、s a little too much for me. Im a big fan of the standard chrome finish of the MC275 and McIntosh tube power amplifiers past. Who knows, maybe the folks at McIntosh will release a “standard” version of the MC 75s in chrome next year? Other upgrades to the basic C22 design is a set of balanced inputs

14、and outputs and a moving coil phono stage in addition to the moving magnet version available on the first C22. MM capaci- tance and MC loading are adjustable on the front panel. Gain is fixed for the MM stage at 40db and the MC stage at 60db, just like the C2300 preamplifier. While it does not have

15、as many balanced inputs and outputs as the C2300, a quick call to Roger Stockholm at McIntosh revealed that the 60th anniversary C22 and the C2300 share a lot of DNA, and their core circuitry is virtually identical. “We wanted to put the cartridge loading right on the front panel, just like the orig

16、inal though, and the C22 does not have the microprocessor control of the C2300, but it is lit with LEDs so it should last for a very long time.” (continued) I think McIntosh has achieved aesthetic perfection with the current issue C22 as well: its just the right balance of classic Mac with subtle up

17、dates. RadioFans.CN 收音机爱 好者资料库 R E V I E W 2009 Printed with permission from TONEAudio. Modern Sound Though these components look vintage, the sound is of this century. Ron Cornelius of McIntosh put it best when he said, “These are not museum pieces to put on a mantle. They are to be used and enjoye

18、d as a state of the art tube McIntosh audio system.” While styling is always very personal, having lived with the C2300 and the C22, I like the simple elegance of the C22. But maybe its the nostalgia gland in my brain. Cornelius also told me that the MC75 monoblocks are “more like baby MC2301s than

19、just an MC275 split onto two separate chassis.” Roger Stockholm confirmed that the output transformers on the MC75 are complete- ly different than the ones used in the MC275, though each mono- block uses an MC275 power transformer. This keeps the MC275s running extremely cool and a substantial power

20、 reserve is always on tap, thanks to what is essentially, twice the power supply of an MC275. These are special amplifiers, and thanks to the 2-ohm output taps, I was able to drive the MartinLogan CLXs much easier than could my MC275, which only has a 4-ohm tap. However, I found nirvana with the 60t

21、h anniversary gear connected to the Verity Au- dio Sarastro IIs. These full-range floor-standing speakers that are very efficient, so the MC75s always had power to spare. This was a system that I could live with happily ever after! “These are not museum pieces to put on a mantle. They are to be used

22、 and enjoyed as a state of the art tube McIntosh audio system.” (continued) R E V I E W 2009 Printed with permission from TONEAudio. When comparing the MC75s to a good friends early vintage MC275 with NOS tubes, you can really see how McIn- tosh has refined their design over the years. The MC75s sti

23、ll have a healthy dose of the midrange magic thats made them famous, but they have much more grip and authority in the lower registers and more resolution in the upper mids and treble. Even compared to the cur- rent MC275, the MC75s push the sound- stage wider and are more transparent overall. I sus

24、pect that a certain amount of this is due to splitting up the ampli- fiers on separate chassis with their own power supplies, but the difference is not subtle, especially when listening to tex- turally complex music at high volume. Modern Features If you are a current McIntosh owner, you are familia

25、r with the standard issue remote control, with about 100 small backlit buttons. It has a nice feel, but if you are older than 35, it will have you reaching for the reading glasses. The new HR22 remote that comes with the C22 is a model of elegance and function- ality. Ill go on record as saying this

26、 is the best remote control Ive had the pleasure to use. The power button is located at the top left, with volume up/down located beneath. Should you be using your C22 with one of McIntoshs CD players (I used the MCD500); a data cord between the preamp and CD player will allow that re- mote to contr

27、ol your CD player as well. The big bonus with the MC75 mono- blocks is that they feature remote turn on. This has always been my sole com- plaint with the MC275 stereo amplifier. I know a lot of McIntosh owners have “all Mac” systems, so the ability to turn the whole system on from this one remote i

28、s very cool indeed. McIntosh makes a shielded cable specifically for this pur- pose in a six-foot length that you can purchase at your dealer. Or the nearest Radio Shack will do, especially if you need to run longer lengths. Ill go on record as saying this is the best remote control Ive had the plea

29、sure to use. (continued) R E V I E W Control Flexibility As someone who has always had multiple sources, Ive always appreciated the way McIntosh always gives you a ton of inputs. They used to call their preamplifiers “control centers,” and that is a perfect description. The back panel features two s

30、ets of (switch- able) RCA outputs and a set of balanced XLR outputs along with a set of fixed output RCA jacks for any recording device you might have. It worked perfectly with my KORG MR-1000 portable digital recorder and Nakamich ZX-7 tape deck. There are six sets of RCA high-level inputs, two set

31、s of balanced XLR inputs along with separate MM and MC phono inputs. MC loading is adjusted on the front panel and has a range of 10, 25, 50, 100, 200, 50 and 1,000 ohms, while MM capacitance is adjustable from 30-350pf in 50 pf increments with the standard 47k loading. Quiet! The first thing you wi

32、ll notice about the 60th anniversary pair is how quiet these pieces are together. Even with the phono inputs, you can turn the volume control up to maximum with no hiss com- ing from the speakers. Its very impressive how much attention to detail the McIntosh engineers have paid to the subtleties in

33、this pre- amplifier. Again, the phono stage is the same one from the C2300. You could probably swap the tubes for some older vintage models and get a different sound, but I was impressed enough with the stock tubes when I had the 2300 that I did not bother to roll any tubes in the C22. I did really

34、appreciate having the ability to connect two turntables to the C22, and used my modded Technics SL-1200 with Clearaudio Maestro Wood through the MM input and the Rega P-9 with Lyra Dorian through the MC input. As someone who has always had multiple sources, Ive always appreciated the way McIntosh al

35、ways gives you a ton of inputs. 2009 Printed with permission from TONEAudio. (continued) R E V I E W I predict that the people who manage to get their hands on these will have something very special indeed. This is a system I could retire with. I had equally good luck with other cartridges I tried w

36、ith varying outputs. Even with the relatively low-output Dynavector 17D3 (.23mv), I still had enough gain so that noise did not creep into the presentation. Sonically, Id put the internal phono stage on par with what you might find in the $1,500 range in an external phono preamplifier, but it is one

37、 of the quietest tube phono preamplifiers Ive heard at any price. Personally, I like it all on one chassis fewer interconnects and power cords to com- plicate the system. Fantastic Balance The hallmark of the 60th anniversary McIntosh system is its overall balance. I commend McIntosh on pricing thes

38、e fairly; con- sidering the dedication of McIntosh lovers worldwide, they probably could have doubled the price and sold every set they could build. For $15,000, you get a fantastic tube preamplifier with consid- erable flexibility, great sound and two phono inputs along with a very powerful pair of

39、 monoblock amplifiers that should be able to drive all but the most inefficient speakers. I predict that the people who manage to get their hands on these will have something very special indeed. This is a system I could retire with. Do you want originals or the updated classic? If you still love th

40、e Porsche 356, go find a mint early vintage C22 and send it to Audio Classics for a full checkup. According to their president, Steve Rowell, a mint C22 can fetch as high as $4,000 and a mint pair of original MC75s often sell in the $4,000 - $6,000 per pair range. Considering that the C22 sold for $

41、279 and the MC75s sold for $229 when new, thats pretty substantial ap- preciation for HiFi gear that is almost 50 years old! If you would rather have the new Porsche 997, the 60th an- niversary C22 and MC75s are your ticket to ride. All of the old vol- ume controls and switches have been replaced by

42、 microprocessor controls and those hard to replace lightbulbs that illuminate the front panel are gone in favor of LEDs that might outlast you. And just for old times sake, spin a copy of Bridge of Sighs. I know youll dig it. l 2009 Printed with permission from TONEAudio. PeRIPHeRAlS Digital Sources

43、 McIntosh MCD500 SACD player, MS300 music server Analog Sources Rega P9 w/Lyra Dorian, Sound HiFI Technics SL1200 w/SME 309 and Sumiko Blackbird Speakers Harbeth Monitor 40.1, MartinLogan CLX, Verity Audio Sarastro II Cable Shunyata Aurora Interconnects, Stratos SP Speaker cable, Anaconda power cord

44、s Power Conditioning Running Springs Jaco McIntosh: For the Love of Music written by Ken Kessler is included with the purchase of the McIntosh Anniversary Collection along with a letter of authenticity signed by CEO Charlie Randall. The McIntosh Anniversary Collection C22 preamplifier and (2) MC75 monoblock power amplifiers MSRP: $15,000 McIntosh Laboratories 2 Chambers Street Binghamton, NY 13903 607-723-3512 R E V I E W 2009 Printed with permission from TONEAudio. TONEAudio Magazine