VTL MB-300

The amplifier features a large capacitor bank in the power supply, suggesting a need for a variac for safe startup.
The MB-300 has test points and a trimmer for bias adjustment, with some models potentially offering internal biasing procedures.
Early versions of the MB-300 had a switch and meter on the front panel for bias adjustment, while later Signature models might have an internal adjustment.
The MB-300 was later updated to the MB-450 Signature model, with cosmetic changes and an additional power supply for the driver stage, while maintaining the same power output.

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ype: Tube Monoblock Power Amplifier
Power Output: 300W (no load specified)
Tube Complement: 12AT7, 12BH7, and 6550 (x8)
Bias: Fixed-biased at class-A1
Power Supply: 550V with 1650uF of storage capacitance
Input Sensitivity: 775mV RMS
Source Impedance: 0.1 ohm
Dimensions: 19" W x 10" H x 22" D (estimated from similar models)
Weight: 75 lbs each