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The "blueprinted" CJ MF2250A is supposed to be 10% better than stock. Huh? This was done by the seller's "engineering department" ;-) What, a snot nosed Jr High kid with a soldering iron and needle nose pliers?First of all, I had the CJ MF2250 and the MF2250A. The "A" version supposedly improved the internal grounding scheme that CJ used and was supposed to lower the noise floor.
To my ears... it made ZERO difference. Still a little sensitive to cables and if not set up just so, a little bit of 60Hz hum in my speakrs. The amp still had that smooth but somewhat polite (less than dynamic) CJ sound. Nice but not great if impact and speed is what you crave.
But what the heck is a "blueprinted" amp?
The seller also tries to convince you that CJ dropped this amp from their product mix because of rising costs. This amp would cost $3500 today according to the seller. Personally I think CJ dropped it because it wasn't a great seller but what do I know.
Follow Ups:
This is totally not relevant but I had my race motorcycle engine blue printed and it made a huge difference...more horsepower, less internal friction, quicker revving. Of course blue printing a mechanical system like a motorcycle engine is much different than an amp. From a theoretical point of view, it makes sense. All the parts picked for the amp has a performance specification range that it has to meet in order to be accepted by the manufacturer. Blue printing will only use components that are on the low end of the tolerance. Will this add up to better sound quality? I dont know but it did wonders transforming my stock engine into a very good race engine...
The amp may be blueprinted but the seller should be fingerprinted. Mo feedback, money order only, may put the Con in Conrad.
I found this via a google search on "balanced and blueprinted". Click link below." So, the next time someone says, “I have a balanced and blueprinted engine”, smile and say, “So do I. From the factory.”. "
Manufacturing tolerances today are very, very close. Back in the "day" they weren't and "blueprinting" involved completely disassembling an engine, balancing it and bringing all tolerances up to spec.
"Man is the only animal that blushes - or needs to" Mark Twain
...so now we can push the tolerances more, which would be better, I suppose.
You could say all engines are “balanced” and “blueprinted” but to an auto enthusiast it refers to an engine that is built well beyond your typical grocery getter engine (factory standards).If I was to equate “blueprinted” to audio it would mean that all the components used would have very close tolerances and matched where required. But in high end audio this should be a given. JMO
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Their website lists former 2200 and 2300A models. The "A" is explained: "After two years, the MF2300 was improved by the use of Vishay resistors at critical points in the circuit, extending the open-loop frequency response of the circuit, and upgrading capacitors in the input amplifier power supplies. The improved model was designated MF2300A.I had the 2300A for a long time. I thought it was a great amp and sold fairly well. Using a tube preamp (non CJ) made that unit sing!
Like Kava says below, the "blueprinting" is likely a term borowed from auto mechanics, where an engine is machined and microbalanced between all working parts per cylinder, and tolerances are minimized. Internal fit precision is measured and maximized. In this amplifier case, I would guess they are referring to measured tolerances and balancing parameters between both channels so that they are exact. If a certain resistor in the left channel measured within 5% of its specified value, then the corresponding right channel resistor would have to measure within the same tolerance range or be replaced.
used to work on the midway of one of PT Barnum's shows......Cheers,
What next?
Gee, I think that something special- just like when my wife watches me "release the Magic Blue Smoke" from certain special projects!!!Seriously though, it does sound kinda snotty to me. Wonder what my Old Mission Cyrus II will fetch on Epay just because I updated the electrolytics and made note of it in the service manual!!!
Hehehe...
"David! You can KILL a man with a chopstick!" -Keith Charles, Six Feet Under
"Blueprinting" might refer to measuring parts and comparing their resultant value to the ideal value on the schematic and swapping out all the none spec parts. Just a guess.
Looks like they're trying to appeal to some of those with a hotrod background.
term used (in that manner) was in reference to engines in hot rods
"Man is the only animal that blushes - or needs to" Mark Twain
While I have seen many balanced engines, I have yet to see the actual blueprints.
2250 and 2500 A upgrades were mostly power supply related. They went from a bridge rectifier to four individual diodes and replaced some caps and regulators too. My 2500 to A upgrade was a noticable improvement.
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