The power supply is an often overlooked importance in audio design. The quality and design of the power supply is critical for a top class component. Purity Audio Design spends as much time developing power supplies as the circuits they are driving. After all, one is no good without the other.
A high current transformer is used for the main B+ voltage requirements as well as feeding the regulated DC supply for the 6SN7 filaments. A separate high current toroidal transformer is used to feed the regulated filament supplies for each 300B. Each 300B tube as well as the 6SN7 driver tubes received its own, highly regulated DC supply. Separate DC filament supplies provide total isolation between the input and output stages. The use of LCR filter networks with very large polypropylene capacitors and heat sinked high power resistors provide an unparalleled ripple reduction and low noise operation.
Mains input voltage is set at the factory and is available for 115V/230V 50-60 Hz operation.
The chassis is constructed entirely of 1/8" thick aircraft quality black anodized aluminum and then hand assembled in our New York facility. The transformer covers are custom made of 1/8' thick walled 6061 aluminum and finished in a flat black powder coat.
Vacuum Tubes: Each PSE300B comes equipped with the following tubes:
4 pieces - Sophia Electric Princess 300B
2 pieces - Sophia Electric Grade A 6SN7
2 pieces - 5U4 Rectifier