Canary Audio M500 300B tube monoblock amplifier Excellent condition

For sale is excellent condition of Canary M500 monoblock amplifier. This pair come with upgraded Sophia Electric 300b tube with less than 200 hours of usage.
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Manufacture detail of amplifier:
M500 Monoblock Amplifiers Built around 300B Triode Tubes: The M500 is a class A triode mode, push-pull parallel monoblock power amplifiers with 300B output tubes. It features a modified circuitry that guarantees a more dynamic soundstage with deeper base tones. Like all other Canary products, only highest quality parts and components are used in critical applications. The oversize custom wound power and output transformers are specially designed to handle twice of its power rating, ensuring durability. Two independent chokes are employed for rectifier filtering on each channel.  The Muscular Canary: The M500 monoblock power amplifiers are specially designed for optimum sound quality. Deliver high power music at wide dynamic range with ultra low distortion, the M500 is simply the finest amplifier one could desire. Maybe the muscular canary doesn't exist in nature, but if one existed, it might sound something like this amplifier. 
Special Features: 

Newly designed high voltage power supply.

Rectifier with double choke filtering (two chokes are employed per channel).

The input circuit has been redesigned to be faster and more dynamic. 

Custom EI power transformers.

Exclusive machined Delrin 300B tube sockets with gold plated pin receptacles.

Bias LEDs for easy and precise adjustment.

Specially designed power meter with a custom backlite LED display.

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SPECIFICATIONS 

Rated Power Output:50 Watts RMSInput Sensitivity:0.75 Volts for full outputInput Impedance:150,000 OhmsFrequency Response:+/- 1dB from 10 Hz to 80,000 HzTotal Harmonic Distortion:< 0.2%Signal-to-Noise Ratio:-81 dB below 1 WattDamping Factor:14Power Consumption:350 Watts (true RMS)Output Impedance:4, 8 OhmTube Complement (per monoblock):4 x 300B 
2 x 6SN7GTB 
2 x 5U4GBDimensions (per monoblock):12" W x 25.5" D x 9" HNet Weight (per monoblock):75 lbsWarranty:3 Years Parts and Labor
Specifications subject to change without notice.