Denon POA 6600A (c. 1990)
The Denon POA 6600A was a 250-watt monoblock power amplifier. HI-Fi-Stereo-Buyers listed it at $1,398 in its 1990 equipment pages (February 1990, p.91). That same listing preserves most of what is known about it: 17 × 4 × 12 inches, 18 lb, and an instantaneous peak current capability of ±30 amps. It sat above a smaller sibling, the POA-4400A. A later listing called that one “similar to POA-6600A” but rated it at 150 W into 8 ohms (HI-Fi-Stereo-Buyers, 1991, p.77).
Denon built the 6600A around its Dual Super Non-NFB circuit, a non-negative-feedback topology aimed at high-speed signal transmission. The period listing notes a pure-current power supply with a separate power-supply block chassis. The input stage is direct-coupled and biased with regulated constant-current sources. The output stage uses 20 high-speed power devices. The amp had no active protection circuits and kept fuses out of the signal path (HI-Fi-Stereo-Buyers, 1990, p.49).
Beyond those buyer's-guide entries, the record thins quickly. No production years, owner's manual, or further design documentation has surfaced in the archive — but the 1990–91 listings establish the essentials: a serious single-channel Denon built for speed, priced around $1,400, and positioned above its 150-watt sibling.
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