MB-250

About the MB-250

The VTL MB-250 Signature Monoblocks are high-end tube amplifiers designed to deliver 250 watts per channel in pure triode mode, offering a unique blend of power and musicality. They feature a vacuum tube complement of 8 x 6550C power tubes, 1 x 12AT7, and 1 x 6350 tube per amplifier. These amplifiers are capable of driving difficult speakers with ample power and produce an extended high-frequency response, tangible mids, and warm yet controlled mid-bass. The sound character is noted for its natural sweetness and listenability, making them particularly enjoyable for strings and vocals. The MB-250 operates in class AB1 with a frequency response of 1 – 75 kHz (-3dB at <0.2% THD at 1W). Inputs include balanced XLR and single-ended RCA, with 5-way binding posts for speaker connections. The amplifiers consume 250W at idle and up to 800W at full power. Dimensions are 19 x 13.25 x 9 inches, and each unit weighs approximately 70 lbs. They are known for reliability and long tube life, with tubes lasting upward of 5000 hours. Biasing requires periodic adjustment using a multimeter. These amplifiers are highly regarded for their sonic qualities and build quality, though some users note biasing can be less straightforward than other models.