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    McIntosh MC275 guts

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    audiobill

    Posts : 271
    Join date : 2014-03-13
    Location : Philadelphia

    McIntosh MC275 guts

    Post by audiobill on Wed Sep 23, 2015 12:34 pm

    No magic here, IMO - scroll down:

    http://audiolab.co.jp/old/used/amp/mcintosh/mc275_081004/mcintosh_mc275_081004.htm

    Bob Latino
    Admin

    Posts : 2378
    Join date : 2008-11-26
    Location : Massachusetts

    Re: McIntosh MC275 guts

    Post by Bob Latino on Wed Sep 23, 2015 2:11 pm

    A lot of those McIntosh original amps like the MC275 bring big bucks in Japan. 650,000 yen is about $5400 USD. That would be a real high price for that amp in the USA. A lot of the pricing may have to do with the fact that probably not too many of those original McIntosh amps were ever shipped to Japan. All the McIntosh amps are well made and very reliable. Every Mac amp that I ever heard (unfortunately) sounded to me a little just a little soft on the top end. A customer had the same impression when he compared the two in December of 2013. See link below ..

    Comparing the VTA ST-120 with the McIntosh MC275

    Bob

    MarcVBelgium

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    Age : 62
    Location : Antwerp, BELGIUM

    Re: McIntosh MC275 guts

    Post by MarcVBelgium on Thu Sep 24, 2015 12:53 pm

    I have both amps MC275 MkV and St-120....... I've changed all driver tubes on the MC275 woth NOS (Philips Mil.spec) tubes and the McIntosh labeled KT-88 were changed by the Genalex Gold Lion KT-88. With these changes the amps are really up to each other.... Remains the fact that the Mc is far more expensive...

    deepee99

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    Location : Wallace, Idaho

    Re: McIntosh MC275 guts

    Post by deepee99 on Thu Sep 24, 2015 9:23 pm

    MarcVBelgium wrote:I have both amps MC275 MkV and St-120....... I've changed all driver tubes on the MC275 woth NOS (Philips Mil.spec) tubes and the McIntosh labeled KT-88 were changed by the Genalex Gold Lion KT-88. With these changes the amps are really up to each other.... Remains the fact that the Mc is far more expensive...

    It strikes me as odd, too, that "high-end" amp and pre-amp makers will use average or bargain basement tubes.

    mazeeff

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    Age : 61
    Location : Grand Rapids, Michigan, USA

    Re: McIntosh MC275 guts

    Post by mazeeff on Fri Sep 25, 2015 8:08 am

    On the show "How its Made", on the Science channel, they showed how a new McIntosh 275 is made. I was shocked by the lack of quality, and the abundant use of spade lugs. There seems to be more focus on the green LED's that light up under each tube. Both the chassis and PC boards seem very flimsy.

    https://www.youtube.com/watch?v=2HgS6gvokEI

    Mike

    corndog71

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    Join date : 2013-03-19
    Location : It can get windy here

    Re: McIntosh MC275 guts

    Post by corndog71 on Fri Sep 25, 2015 2:19 pm

    I wondered how toroidal transformers were made.

    https://youtu.be/82PpCzM2CUg

    polarflux

    Posts : 40
    Join date : 2010-02-12

    Re: McIntosh MC275 guts

    Post by polarflux on Fri Sep 25, 2015 7:25 pm

    I thought it was black strap molasses in those transformers for that sweet sound?

    pedrocols

    Posts : 62
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    Location : Western MA

    Re: McIntosh MC275 guts

    Post by pedrocols on Fri Sep 25, 2015 8:54 pm

    No point to point that's for sure....

    MarcVBelgium

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    Age : 62
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    Re: McIntosh MC275 guts

    Post by MarcVBelgium on Sat Sep 26, 2015 11:42 am

    mazeeff wrote: On the show "How its Made", on the Science channel, they showed how a new McIntosh 275 is made. I was shocked by the lack of quality, and the abundant use of spade lugs. There seems to be more focus on the green LED's that light up under each tube. Both the chassis and PC boards seem very flimsy.

    https://www.youtube.com/watch?v=2HgS6gvokEI

    Mike

    No Rolling Eyes If there was a "dislike" knob here, I would use it .......

    Bob Latino
    Admin

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    Re: McIntosh MC275 guts

    Post by Bob Latino on Sat Sep 26, 2015 11:51 am

    A lot of people don't know that McIntosh as well as Audio Research are now owned by Fine Sounds of Milan, Italy. Yes - the McIntosh amps are still made in Binghamton, NY but all the corporate decisions of what to make and "How It's Made" are undoubtedly made in Italy.

    Bob

    peterh

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    Re: McIntosh MC275 guts

    Post by peterh on Sat Sep 26, 2015 1:02 pm

    mazeeff wrote:On the show "How its Made", on the Science channel, they showed how a new McIntosh 275 is made. I was shocked by the lack of quality, and the abundant use of spade lugs. There seems to be more focus on the green LED's that light up under each tube. Both the chassis and PC boards seem very flimsy.

    https://www.youtube.com/watch?v=2HgS6gvokEI

    Mike

    I'm not scared by this film, on the contrary using spade lugs ( crimped on the cables) is a
    good way to make reliable connections.

    What did concerned me was the tube sockets that was only soldered on a circuit board.
    A tube-roller could easily damage the soldering and/or the board itself. Much better
    soild be if the sockets were fastened with distances in the board, or even better in
    the steel chassie.

    Filling the transformer containers will prevent any future rewinding, and also to some
    extent reduce cooling, which might be a problem. If mechanical stiffness is needed
    it's much better to vacuum-impregnate with lacquer. The filling however might not
    be a problem in itself.


    Tubes4ever

    Posts : 59
    Join date : 2015-07-14
    Location : Star, Idaho

    Re: McIntosh MC275 guts

    Post by Tubes4ever on Sat Sep 26, 2015 1:17 pm

    My main complaint is why all the silicon in a tube amp?? I also noted the tube sockets being soldered to the board.

    The green LEDs take away from the natural glow of the 12AT7 tubes and look flashy just for flashy's sake. I don't get this trend of lighting up tubes from the bottom when they produce their own wonderful glow from within.

    MarcVBelgium

    Posts : 81
    Join date : 2013-12-06
    Age : 62
    Location : Antwerp, BELGIUM

    Re: McIntosh MC275 guts

    Post by MarcVBelgium on Sat Sep 26, 2015 7:18 pm

    Bob Latino wrote:A lot of people don't know that McIntosh as well as Audio Research are now owned by Fine Sounds of Milan, Italy. Yes - the McIntosh amps are still made in Binghamton, NY but all the corporate decisions of what to make and "How It's Made" are undoubtedly made in Italy.

    Bob


    In may 2014 there has been a MBO (management byout) from the Fine Sounds Group by Charlie Randall (with McIntosh since 1985) and Mauro Grange. So, as far as McIntosh is concerned , I really beleive that the decisions still (or...again) are made in Binghampton.

    http://www.marketwatch.com/story/grange-and-randall-lead-management-buyout-of-fine-sounds-group-in-partnership-with-lbo-france-and-yarpa-2014-05-09

    Whether some friends here consider the Mc275 "not well made and lacking quality" (a statement I totally disagree with),I can assure you that it still is a very, very good sounding amp.
    Loving it is not "heresy"

    PeterCapo

    Posts : 380
    Join date : 2008-12-05

    Re: McIntosh MC275 guts

    Post by PeterCapo on Sat Sep 26, 2015 8:21 pm

    There have been a few different versions of the MC275 over the years.  The reissues that started coming out in the last ten years or thereabouts don't even use the same kinds of tubes that the original used.  Also, the recent reissues may have added transistors somewhere in the circuit.  So, when we talk about the "MC275," we might not be talking about exactly the same amp.

    Nevertheless, the basic circuit design is probably the same as are the special McIntosh output transformers.  I have a Mark IV version, circa 2006, that does not have any transistors in it, IIRC.  It is simply superb.

    I am fortunate to have a few high end shops within driving distance, and for some years now I have listened to some hifalutin gear - a big, very expensive Cary SET amp and other very expensive McIntosh tube amps come to mind, plus other expensive amps.  There are more powerful amps, and there are amps that sound different, but I haven’t heard anything that truly outperforms the qualities my MC275 MK IV has - it is really that good, as far as I am concerned.  I think you'd have to spend an awful lot to outdo it.

    The only caveat, as Bob mentioned, is that the top end can be a bit rolled off (though I do not know if this is true for releases after the MK IV version).  It's not so rolled off that it would be an issue for everyone.  But, if it does matter, it can be mitigated by tube choice.  For instance, I recently retubed using the reissue Tung Sols for the small tubes and EH KT88 for the four power tubes, which resulted in more top end.

    My MC275 MK IV is "better" than my Cary SLI-80 Signature, though the SLI-80 has its own desirable qualities (sugary, with 6SN7 tone).  My dynakitparts Stereo 70 (with performance enhancements) keeps up with both of them at a much lower price, making it an excellent budget choice.

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