Tube Amplifier Power Supply Schematic

Figure 10 power supply schematic.

Tube amplifier power supply schematic. A preamp or an amp is like a tap put after a water tank. This is a very quiet supply and excellently suited to our amplifier. This design makes use of the power transformer and rectifiers in a very clever manner. 16v valve rectifier loss is small compared to b 560v.

On this small three by six inch extra thick 0 094 2oz copper traces usa made pcb resides a high voltage power supply suitable for powering a tube power amplifier. In the above circuit 16v loss is caused by the forward resistance of the 2 large valve rectifiers. That s it for the signal path now let s examine the amp s power supply shown at the bottom of the schematic. Tube power supply a power supply should provide a precise voltage completely stabilized versus perturbations from any kind coming both from the ac source or from the load.

All of this leaves us with the following power supply design. The final output voltage is 1 below target final ripple is 2 9µv or 110 7dbv. A choke input power supply is approx 90 efficient therefore the b will remain relatively stable when a class ab amp is driven at high power. All four diodes are used to form a full wave bridge rectifier for the plate supply but for the screen supply only diodes d1 and d2 are used.

The ps 11 circuit board makes life quite a bit easier for the tube fancier. It has no sense to have the best tap if you have only few and spotted water to put through.