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McIntosh MC275 MK VI Clone

Lots of clone builds and builds based on various brand models here on AK. Some from kits, others from scratch. I have a few myself.
 
rustnrot said:
The original MC275 did not have bias adjustments. But adding them is a net positive. The Unity Coupled design only lessens their need, not necessarily remove it. I added bias adjustments to enhance my Unity Coupled amp referenced earlier in this thread.

The older MC275 OPTs were trifilar wound. The newer ones are not. Trifilar or not still requires a phase inverter.
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Yeah the newer ones do not use C-cores, made with a lower performance EI core. The ommision of a phase inverter comment only relates to having a signal source that is already differential (ie balanced XLR)
 
While we're here I find it interesting that the MC75 reissue (also available as a clone) uses one less tube than it "should" have. The input tube is replaced with an op amp. I tried to upload the service manual for it but it won't upload the pdf even when I reduce it to 1.6 meg.
 
rustnrot said:
While we're here I find it interesting that the MC75 reissue (also available as a clone) uses one less tube than it "should" have. The input tube is replaced with an op amp. I tried to upload the service manual for it but it won't upload the pdf even when I reduce it to 1.6 meg.
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Do you have a link to the clone item?
 
empirelvr said:
This is an interesting situation. Nothing in the amplifier is proprietary anymore (Patents last for twenty years, so the transformer design is in the clear and the original patent is easily obtainable on the net: https://patents.google.com/patent/US2477074A/en), the circuitry is not a secret (schematics everywhere), things like knobs, binding posts, RCA jacks etc are just widgets, and I don't think McIntosh has a copyright on the physical look and design of their products. (It is possible to do so, but I can't find a mention if McIntosh has ever done that.)

Nowhere on the unit does it say McIntosh, and it isn't being represented as a genuine McIntosh. It also looks to be well made.

So I'm not sure you can say it's necessarily stolen. Bad faith? Yes. Sleazy? Definitely. But is it actually breaking any laws? Unlike...say...when in the early 1980's certain shady stores were flooded with cassette tapes by "KDK" that looked exactly like TDK products and were absolutely an attempt to fool people into thinking they were buying TDK tapes, there appears to be no attempt to make you think you are getting a real Mac.

How different is this to the classic car kits that are available? (And I'm really asking. I know they exist but nothing else about them.)

As they say, imitation is the sincerest form of flattery. And by the looks of it, this unit is very flattering!

Hmmmm...:idea:
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Really

It is all about the sound! McIntosh MC 225 patents are expired. Who invented the first tire, the first car??. You all need to relax if you can’t afford a Ferrari your gonna buy a Porsche, not a Porsche a Honda? If you don’t like it don’t buy one.
Audio Snobs
 
After having spent part of my life restoring antique and classic cars, there's no way a kit could be made that approximates a classic car as closely as the
Orsefons replicate a Mc275, if that is, the transformers are unity coupled...I can't see a Duesenberg car kit being made with that gorgeous straight eight DOHC engine...
 
my experience with chinese gear always ends tragically. good for you, though. considering I missed out on a real one because my bid was a hundred short of 5000...still would like to hear what the mc tube hype is about. would probably sound better than the mc SS amps I listen to.

they're probably headed to china anyway:
"McIntosh Group has been acquired by Highlander Partners, a Dallas-based private investment firm that manages over $2 billion in assets. Highlander Partners announced the news today, describing the acquisition as the basis for its new "luxury technology platform".g
 
Pio1980 said:
https://pursangargentina.com/
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Those aren't kit cars, they're recreations, and with miniscule engines compared to the 420 cubic inch Duesenbergs...heck, the entire weight of one of those Pursang replicas might come up to the weight of the Duesey's engine...

I've been around kit cars, some were quite good, but most weren't executed by the builders very well...the modern hot rod kits aren't aimed at a classic reproduction, so really the closest we can come to in this argument is one of the hot-rodded Dynaco based amp kits out there, kind of compares to the VW Baja Bug I built back in '73...65 convertable, 71 dual port engine, cam, Holley Bug Spray, power pulley, distributor, headers...a lot of fun on and off road...except for 6 volt electrics...
 
RickB said:
Those aren't kit cars, they're recreations, and with miniscule engines compared to the 420 cubic inch Duesenbergs...heck, the entire weight of one of those Pursang replicas might come up to the weight of the Duesey's engine...

I've been around kit cars, some were quite good, but most weren't executed by the builders very well...the modern hot rod kits aren't aimed at a classic reproduction, so really the closest we can come to in this argument is one of the hot-rodded Dynaco based amp kits out there, kind of compares to the VW Baja Bug I built back in '73...65 convertable, 71 dual port engine, cam, Holley Bug Spray, power pulley, distributor, headers...a lot of fun on and off road...except for 6 volt electrics...
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The Pur Sang are replicas for the most part, I'd never though much of kit cars generally or what I call "tribute cars" that are badged with extinct vintage car nameplates, Bugatti excepted. I'm still not that comfortable with resto-mod vintage cars but understand wanting the authentic presentation of a vintage classic with the comforts, readability, reliability, and serviceability of a modern running gear foundation. Part of my interest in something like a Cadillac V16 is actually having the original mill under the hood, white elephant or not.
A pretty impressive Caddy V16 resto-mod;
14839.jpeg
 
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RickB said:
Those aren't kit cars, they're recreations, and with miniscule engines compared to the 420 cubic inch Duesenbergs...heck, the entire weight of one of those Pursang replicas might come up to the weight of the Duesey's engine...

I've been around kit cars, some were quite good, but most weren't executed by the builders very well...the modern hot rod kits aren't aimed at a classic reproduction, so really the closest we can come to in this argument is one of the hot-rodded Dynaco based amp kits out there, kind of compares to the VW Baja Bug I built back in '73...65 convertable, 71 dual port engine, cam, Holley Bug Spray, power pulley, distributor, headers...a lot of fun on and off road...except for 6 volt electrics...
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Your comparison to a mod'ed Dyna 70 is interesting and apt with the example you cite. Dunno how many different kit cars were done for the VW bug running gear, including dune buggies, maybe hundreds worldwide?
 
Pio1980 said:
The Pur Sang are replicas for the most part, I'd never though much of kit cars generally or what I call "tribute cars" that are badged with extinct vintage car nameplates. I'm still not that comfortable with resto-mod vintage cars but understand wanting the authentic presentation of a vintage classic with the comforts, readability, reliability, and serviceability of a modern running gear foundation. Part of my interest in something like a Cadillac V16 is actually having the original mill under the hood, white elephant or not.
A pretty impressive Caddy V16 resto-mod;
View attachment 2667941
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I'd love to hear it with a good header system and steel packed "mufflers"!
 
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