Conrad Johnson Premier 12 Mono Block Amps/Pair

These Connie amps are in almost perfect condition. The units were upgraded with Teflon capacitors in 2009 and in March of 2015 I sent them to Conrad Johnson for a tune up. They replaced transistors, and did a full service check. They also installed new tubes in both amps at that time. I purchased new boxes from CJ which they shipped the units back to me in. Receipts for this work available upon request.

If you love CJ you will love these amps paired with the Premier 16LS Preamp. It just doesn't get any better than that.

Here's what Conrad Johnson has to say:

Premier Twelve Vacuum Tube Amplifier

The Premier Twelve is a mono-block tube power amplifier, in effect a smaller, lower powered version of the Premier Eight.

It used two pair of 6550s to produce 140 watts. It is similar in size
and circuit to the stereo Premier Eleven. The Twelve-XS is a Twelve
with the output stage configured to use a pair of EL34s operated as
triodes to produce about 60 watts.

The Premier Twelve 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.

Specifications:

• Power Output: Ultralinear Operation: 140 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: 60 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.

• Input Sensitivity: 0.90 volts to full power

• Hum & Noise: 98dB below full power

• Input Impedance: 100K ohms

Mechanical:

• Dimensions: 17.5W | 7.25H | 15D inches

• Weight: 48 lbs.

Features:

• 5-way binding post speaker connectors

• one pair of inputs

• two plate fuses

• power switch