Power amplifiers stereo — VTL ST-150

The ST-150 is an accomplished stereo tube amplifier from VTL, delivering more than 150W per channel (300W stereo) for excellent sound clarity and sufficient power in a compact package, with exceptionally realistic and detailed sound. The ST-150 brings VTL's considered American engineering to a serious, dual-mode tetrode-or-triode tube-amplification format.

Key specs that matter

Input impedance is a substantial 130,000 ohms single-ended. Output power switches between 120W tetrode mode and 60W triode mode into 8 ohms - a distinctive selectable-topology feature. Frequency response spans 20Hz to 20,000Hz within plus-or-minus 3dB. Maximum power consumption is 800W. At 480 x 300 x 230mm and 50kg, the ST-150 maintains a substantial tube-amplifier chassis for its compact-package positioning, reflecting VTL's considered dual-mode engineering.

Sound and use context

Expect a realistic, detailed sound reflecting the selectable tetrode-or-triode operating mode, with tetrode delivering higher power and triode offering the classic single-ended-triode character - a genuine choice of sonic signature from one amplifier.

Pairing

The selectable tetrode-or-triode operation allows the ST-150 to be matched to a specific loudspeaker's sensitivity and the listener's preferred tonal balance.

Alternatives

VTL's own broader stereo-amplifier catalogue offers related alternatives at different power levels within the same considered dual-mode engineering philosophy.