Conrad-Johnson Premier Eleven Tube Amplifier - 70WPC

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70W classic design amplifier from USA maker Conrad-Johnson. 

We now have a second Premier Eleven listed in case you'd like to bi-amp your speakers for the ultimate in Conrad-Johnson tube amplification!

Super clean, serviced and working brilliantly. Tested and biased by our in-house tech where it passed with flying colors. 

Tube Notes:
• Philips ECG 6CG7 (Balanced)
• GE 5751
• Svetlana 6550C (Two Matched Pairs)

A great match to one of these CJ preamps in stock (Click Here to View All)

More from Conrad-Johnson
Premier Eleven Vacuum Tube Amplifier

Essentially a scaled down, stereo version of the Premier Eight, the Premier Eleven delivered 70 watts per channel from a single pair of 6550 output tubes.

The Premier Eleven used only the finest component parts in all stages including the power supply. The power supply used only polypropylene and “cjd” polystyrene capacitors as opposed to the traditional deployment of electrolytics. The main storage reservoir used polypropylene capacitors with polystyrene shunts.

The Eleven-A added a noise filter on the bias indicator circuit, first employed in the Premier Twelve. The Eleven-XS is an Eleven-A with the output stage configured to use a pair of EL34s operated as triodes.

Features:
• 5-way binding post speaker connectors
• One pair of inputs
• Two plate fuses
• Power switch

Conrad-Johnson Premier Eleven Tube Amplifier - Owner's Manual

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best

Kimber Kable - Speaker Cables - Good

Kimber Kable - Speaker Cables - Better

Kimber Kable - Bi-Wire Speaker Cables - Best

Kimber Kable - Power Cords - Better

Kimber Kable - 14AWG (Gauge) Power Cords - Best

Specifications:
Power Output ­ Ultralinear Operation:
70 watts per channel RMS at 4, 8, or16 ohms both channels driven from 30Hz to 15kHz with no more than 1% THD or IMD.

Power Output ­Triode Operation:
30 watts per channel RMS at 4, 8, or16 ohms both channels driven from 30Hz to 15kHz with no more than 1.5% THD or IMD.

Frequency Response:
20Hz to 20 kHz, +0, -.1 dB

Input Sensitivity:
0.9 volts to rated power

Hum & Noise:
96 dB below rated power

Mechanical:
Dimensions:
17.5" W | 7.25" H | 15" D

Weight:
48 lbs.

The SkyFi Testing Process for Tube Amplifiers:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and tubes are inspected for signs of stress overheating or cracking.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If it all looks clean we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier the remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will also be tested.

We also test all tubes for output gain and leakage on our calibrated modern and profesional tube tester against the original manufacturers specifications. If needed, the tubes will be replaced from our vast NOS (New Old Stock) vintage or modern inventory.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.

SkyFi Tech Notes:
• Converted back to 4 ohm
• Changed feedback resistors to QTY 2 ~ 5.1K, RN65
• Changed OPT Secondary wiring, White/Yellow & Black/Gray
• Test clean to 70W into 4 ohms
• Listening Test ~ PASS