![]() Interestingly the dual-power supply in their high-end Monster Receiver for 1977, the KR-9600, featured a dual power supply with a single transformer. Only two amplifiers from Kenwood’s range in this period featured this dual power setup, the KA-7300 and the other was their top-of-the-line ‘Model 600’. Essentially this amplifier was two ‘mono-block’ amplifiers contained in the one cabinet. However in this case Kenwood had followed Harman Kardon’s example and integrated two independent transformers with their own rectifiers and filter capacitors to power each channel. Sansui, Marantz and Pioneer settled for a single large transformer which utilised both the negative and the positive rails to power independent amplifiers. But different brands implemented it differently. Dual Power was first introduced to the market by Harman Kardon and by the mid-70s it had really caught on, mostly in the high-end components. The KA-7300 Power Supply: Separate transformers for each channel.įirs tly lets start at the foundation of this beastie, it’s power supply. ![]()
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