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monoblock tube amplifier
Price: $ 12,000.00 / pair
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Consistent with conrad-johnson's design philosophy that circuits should be
kept as simple as possible, these amplifiers work their magic with a minimum of
vacuum tubes (six in the mono LP125MSE). A composite triode input stage is
direct coupled to a cathode-coupled phase inverter. The output stage is
comprised of 6550s operated in ultralinear configuration (two pair for the
LP125MSE) for an optimal combination of high power and low distortion. Limited
negative feedback is applied to the circuit to reduce distortion and provide a
sufficiently high damping factor to control most real-world speaker systems.
Discrete dc power supply regulators are provided for the input and inverter
stages, in order to isolate each stage from the output signal.
As with all conrad-johnson tube amplifiers, these amplifiers require no
complicated adjustments or specialized equipment to maintain. To assure
continued peak performance, the owner need only make a simple bias adjustment
when new tubes are installed. Built in LED bias indicators allow the user to
make this adjustment using only the supplied screwdriver.
Component parts quality is a signature strength of any conrad-johnson
product. The audio circuit and related power supplies feature precision metal
film resistors and high-performance polypropylene capacitors. There are no
electrolytic capacitors in the audio circuit or in the related power supplies.
Proprietary wide-bandwidth output transformers contribute to excellent high
frequency performance. Even the input/output connectors and internal wiring have
been carefully selected for optimal sonic performance.
The LP125MSE mono-block delivers a solid 125 watts. Along with the tonal
integrity and faithfulness to the music that are embodied in these amplifiers,
their ease of use, low maintenance costs, and reliability will be a revelation
for those who have only experienced "entry-level" tube gear.
The SE version adds a liberal sprinking of Vishay resistors and cj's
proprietary Teflon capacitors to make one of the best sounding medium power tube
monoblocks we've heard.
Specifications
Power:
LP125M - 125 watts from 30 Hz to 15 KHz at
no more than 1.0 % THD when driven into 4 ohms (also available connected for 8
or 16 ohm loads)
Sensitivity:
LP125M - 0.9V to rated power
Frequency
Response: (at 10 watts): 20 Hz to 20 kHz, +/- .25 dB
Hum and Noise: 102 dB
below rated power
Input Impedance: 100 kOhms
Tube Complement:
LP125M
- 1 x M8080, 1 x 6922, 4 x 6550
Dimensions: 16D x 19W x 6.38H inches
Weight:
LP125M - 47 lbs
All conrad-johnson products are carefully hand assembled and each is
thoroughly tested to assure conformity to our exacting performance standards.
C-j's confidence in these components is reflected in their three year limited
warranty covering labor and parts. Service is a top priority at conrad-johnson.
In the event that a product does require service, it will be handled promptly
and efficiently.
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