New : UHC-MOS (Ultra-High Current) output transistors which can take a lot of current but nevertheless dissipate little heat.Įach can output peaks of 160A (40A continuous) but heat up at only 100W ( 2SK1297) and 160W ( 2SJ217) respectively.
Old : as seen in many 1960s and 1970s bigga powerhouses, one pair of power output devices, no more - if a good (dedicated) circuit is preceding them, sixty pairs of hot bingos aren't necessarily. Old : cascode bootstrap in the power stage, as first revived from the tube era by Sony in the 1977 TA-N7B masterpiece (masterpiece as in "all-time Hall of Fame"), and revived again by Nelson Pass and Marshall Leach later on to much audiophile acclaim. Do use the Google translation tools for the ultimate meat on the circuits of these ultimate Denon monsters. Inside is (was) some of the old and some of the new : old is the circuit structure and simplified power stage, new is (was) the UHC-MOS MOS-Fet power devices which were sourced from Hitachi, alongwith the related pre-driver circuit design and, apparently, an evolution of a Hitachi-patented circuit for the output section.Īll about the POA-S1 and the PRA-S1 can be read here - in french.
Vanishingly low production run for those 79 kg (each !) beasts, each outputting 1,4kW output at 1 Ohm. X-rare power amplifiers launched when Japan's economy was steadily going down - and even lower.
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