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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.

Post Subject: REGENERATION in generalPosted by JOHNR on: 10/12/2015

Look at the solution in a different manner.
Regeneration will typically not be able to service large power transients thus, they are best suited to SET, i.e. constant current systems. Similarly any control loop cycling will usually be heard since they typically operate roughly in the voice band.

A change of view is to use a 220/48 volt SMPS as the core voltage source for a complete system. These will overcome all of the problems of erratic and noisy commercial power supplies. The commercial units are noisy though on their outputs typically, 150millivolts 5 to 8 meg in scope so you have to add a back end filter for this. As with all SMPS, the front end filters are quite inadequate simply because the regulatory standards are so poor thus will interfere with other units hooked up on the same power feed.

48 volt to 6.3, 2.5 and 5 volts converters are easy to make or buy so in the end an amplifier will have fully regulated supplies for every power supply.

The surprise is the totally different sonic result when all of these converters are in place. A DHT tube will no longer be slowed down by the associated power capacitors. The key reason is the holdover time of a 100uF cap on a 60 Hz supply i.e 2-3 milliseconds whilst a 100uF cap supported by a 300 kilohertz supply is typically 1 microsecond.

The future lies in using SMPS because the Regulators (globally) want to see the back of iron bases supplies that are very resource wasteful.

Hope this helps.
John R

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