Amcron 150A

Surviving information on this model is thin. Here is what the record shows. The Amcron 150A was a professional power amplifier, often written D150A in period advertising, and it replaced the earlier D150. Studio Sound (November 1975, p.69) ran a series of ads calling it “a logical follow-up to the world-beating DC300A.” The ads listed DC coupling throughout, a Stereo-Mono switch, the ability to drive loads down to 1 ohm, rack-mount capability, ex-stock delivery, and a claimed 200 watts per channel. That rating was likely into very low impedances, which fits the 1-ohm capability.

By February 1980, Modern Recording (February 1980, p.23) listed a variant called the D 150A IOC in a professional amplifier comparison table alongside the PSA‑2, DC 300A IOC, D 75, and M‑600. The IOC suffix suggests an Input/Output Comparator protection circuit, a feature Crown used on several pro models. The table gave more conservative ratings: 80 watts per channel into 8 ohms and 125 watts per channel into 4 ohms. Whether the IOC was a running production change or a later revision is unknown.

Beyond these period references, a run of Studio Sound ads and a single Modern Recording spec table, no service manuals, user documentation, or independent reviews have surfaced. The 150A appears to have been one of several DC-coupled, high-current professional amplifiers Amcron built in the mid-1970s. The surviving record is sparse.