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RE: Yes, seems to be so

Nice amps but the pricing is almost 10x more than I want to drop on my 'office system'. ;-)

I'm not even remotely suggesting that the Sony is in the same league as the NAT but the similarity in design philosophy doesn't seem that far apart. The Sony also uses a form of 'sliding bias'. It's heat sinks appear to be the same temperature running idle as they do when playing music. And Sony also attempts to minimize the number of output transistors in it's push-pull output stage.

The power amp, meanwhile, uses a simple push-pull design, with a single pair of transistors driving the speaker: as Kingdon’s white paper explains it, ‘In many cases large output amps employ a power amp stage with multiple transistors to achieve high current output volume, but transistors do not perform identically and emitter resistance is used to stabilise transistor variations.

‘In this amp however, the power amp stage features only one pair of transistors and a design that eliminates variations in each channel at the source, enabling elimination of variation-controlling emitter resistance as well.’

The amplifier is also designed to change its bias according to the volume setting, with the result that most users – unless they’re total volume-level maniacs and/or have extremely hard-to-drive speakers – will find the Sony is actually working in Class A for most of their listening.

The idea is that this technique keeps the output devices working in their most linear range, but without excessive heat.



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