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Conrad-Johnson Premier Twelve Tube Monoblock Amplifiers - With C1 Teflon Upgrade and KT120's

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Conrad-Johnson Premier Twelve Tube Monoblock Amplifiers - With C1 Teflon Upgrade And Kt120S

Conrad-Johnson Premier Twelve Tube Monoblock Amplifiers - With C1 Teflon Upgrade and KT120's

SkyFi 479

Pickup currently unavailable

479 South Broad Street
Glen Rock NJ 07452
United States


These gorgeous C-J monoblocks were upgraded to work with KT120 type tubes, which come pre-installed on both pieces in this listing. 

They were also both officially upgraded to the C1 Teflon Upgrade at the factory, to the tune of $3k for the set.  Read the reviews, these amps are spectacular.

We've been running them in our listening room powering a set of vintage Quad ESL-57's, and they sound magical.  Yes it's a bit more power than they need, but the authority and delivery is much improved over the usual lower power Quad amps we typically use.

Both pieces were working perfectly in our lab where they were tested to their full rated output without any drama or noise.

They're almost perfect cosmetically, except for a slight discoloration on one of the tops, probably caused by a cleaning solution.

The tube cages are included, but they don't fit since the KT120's are a bit taller.  If it's important to you for the tube cages to fit, we could modify them to fit prior to shipping.  We personally think these deserve to be seen in all their glory without the cages if possible.

Also includes the original boxes and manuals as shown in the pictures.

From a Stereophile review by Michael Fremer:

"If designing and "voicing" an amp is a high-wire act, the Premier Twelve crossed the Grand Canyon barely breaking a sweat. The overall sound, driving either the Audio Physic Virgos or the Sonus Faber Concerto Grand Pianos, was finely detailed yet rich, open, and transparent, with a lush, mesmerizing midband; deep, well-developed, yet punchy bass; and high frequencies that were fast and sparkly but never bright or aggressive.

The difficult transitions between the frequency extremes and the midrange were carefully accomplished, though the upper midrange exhibited a rich, golden bloom—a sonic bouquet—too subtle to be called a coloration but sufficiently pronounced to enrich brass, strings, female voices, alto sax, and hall ambience with an intoxicating glow."

Power:  140 watts RMS into 4 ohms from 30Hz to 15KHz at no more than 1% total harmonic distortion or intermodulation distortion
Sensitivity:  950 mv to full power
Small Signal Distortion:  Less than .1% at midband
Phase:  Phase correct (non-inverting)
Frequency response:  20Hz to 20KHz +0, -.5dB
Hum and noise:  98dB below full power output
Input impedance:  100K ohms
Dimensions:  15D x 17.5W x 7.25H inches
Weight:  48 lbs.

Click here for a copy of the Owner's Manual

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.



Original Box








Physical Condition


Working Condition


SKU: 100374