The McIntosh 50W-2 is a vintage amplifier that was produced between 1951 and 1955. It succeeded the earlier 50W-1 model, maintaining the same high output power of 50 watts, which is generated by a pair of 6L6-G tubes. The amplifier is notable for its performance specifications, including a bandwidth of 20 Hz to 20,000 Hz and distortion levels of less than 1%. The 50W-2 features a unique dual chassis design, where one chassis is dedicated to the power supply (P50D) and the other houses the amplifier circuitry. Both chassis can be rack-mounted and are of the same size. The driving circuitry consists of two 6J5 tubes, with a 12AX7 tube serving as the phase inverter and preamplifier. For those needing continuous operation above 50 watts, it was advisable to use Tungsol 5881 tubes as replacements for the output tubes. The driver and output transformers are potted within a single case that serves as the amplifier chassis, while the power supply chassis includes a similarly integrated potted power transformer. This amplifier was designed to work with McIntosh’s preamplifiers such as the C104, AE-2A, or ACF-1, yet it could also accommodate any high-quality control unit. The chassis was designed with adaptability in mind, featuring sockets for various plug-in components like an additional 12AX7 tube or input transformers to enhance its versatility. Originally retailing at $249.50, the 50W-2 now is a collector's item, with prices ranging from $1000 to $1500 for working examples in good to excellent condition.
