New: Conrad Johnson MF-2275 Solid State Stereo Power Amplifier

[joeinid]

This could be a great little amp.







cjmf2275 conrad-johnson MF2275 - Stereo Amplifiers

conrad johnson MF-2275 Solid State Stereo Power Amplifier

With the enthusiastic reception of the MF2550 and MF2550SE, it seemed only natural for conrad-johnson to broaden the appeal of this design by offering the circuit in a lower powered, less costly version. We are now pleased to present the MF2275, a 135 watt/channel solid-state amplifier derived from the MF2550.
Specifications:

Power: 135 watts per channel RMS both channels driven into 8 ohms from 20Hz to 20 kHz at no more than 1% total harmonic istortion or intermodulation distortion.

Sensitivity: 2 V rms to rated power
Frequency Response: 20Hz to 20 kHz +0/-.3 dB
Hum and Noise: 100 dB below rated power output
Phase: Phase correct
Input Impedance: 100 kOhms

[Paul]

It looks like the JOB. Isn't it ?

[joeinid]

From the back and outside, that's the first thing that came to mind. I want to hear it.

It looks like the JOB. Isn't it ?

[mep]

I thought it looked like the JOB too. What I don't like is the AC inlet being right underneath the speaker binding posts which causes a cable routing issue right off the bat. I wonder why they didn't list the power output for 4 ohms?

[joeinid]

I agree Mark. There had to be other options. It's funny, on the SS gear they almost never list 4 ohm specs. Not sure why but I believe they do not double down.

[CDLehner]

Ooh; if I wasn't so hung-up, on Line Magnetic right now...I might get very interested.

As I've posted elsewhere...I had an MF-2500A twice; but in the end, switched down to the 2250A...with very little trade-off. Looks like, the 2275 is the 2250, to the 2550/2500!

P.S. I'd still take McCormack's DNA-125/250, over the C-J equivalents...for raw muscle for the buck! C-J are more "refined" I guess.

[ls35a]

If it would work well with my SP-17 and be stable into my Quad ESL 57's I'm buying one.

I hope someone at CJ can answer those questions for me.

ARC used to make pricey, but not crazy gear. The SP-17 was $3500, it's replacement is $9000. Seriously? NINE GRAND?

CJ could step in here and take over the 'high end but not crazy' market.

They should be running pics of this with the Classic 2 SE Preamp. That would be a great looking combination.

[joeinid]

Absolutely, great looking and sounding combo I'm sure.

[mep]

Absolutely, great looking and sounding combo I'm sure.

I know that beauty is in the eye of the beholder, but I ain't seeing much here to behold either inside or out. I'm simply not impressed when I look at the outside of the unit for reasons already mentioned and when I look at the internal layout, I'm not so impressed either. I have no idea what this amp sells for, but it shouldn't be much. That doesn't mean it couldn't sound great with a speaker that has an 8 ohm nominal impedance because that is obviously what it was designed for. Whenever manufacturers only give you the output power into 8 ohms, you can pretty much take it to the bank that is the impedance they were designed for. It takes a big, ballsy power supply to drive a Class A/B amp into 4 ohms with anything close to twice the output power of its output rating at 8 ohms.

[bgiliberti]

P.S. I'd still take McCormack's DNA-125/250, over the C-J equivalents...for raw muscle for the buck! C-J are more "refined" I guess.

I auditioned both the DNA-250 and the C-J -2550 in my system. They raw power is the the same -- both are at PR 350 levels on instantaneous, effortless power. The CJ is simply in different league in all other respects -- completely convincing, so much so that you forget you are listening to "equipment." You never get that feeling with the DNA -- it has an electronic "aura" that always inserts itself between you and the music. The lack of that is what makes CJ gear so different from all others I have heard.

[joeinid]

Welcome to the forum bgiliberti, thank you for joining.

[wizard]

2275 - $3850




2275 SE - $6150



Both are using discrete jfet's on the input stage.
SE uses white teflon coupling caps.

Output stage is bipolar and output current is 15A.

[joeinid]

Nice! Thank you Wizard.