New power supply for my valve amplifier
Target: No oscillation on lower frequencies (pumping speaker) and adjustable output.
First Image: Construction: ~400VDC to ~310VDC.
Second Image: Testing with valve amplifier
Final Version of the power supply: Output Voltage ist 305.5V DC Stable. Changes in the base voltage can drive the voltage up or down a little, but only by 0.025V. Voltage filtering at Input: 10 x 68uF + 2x 47uF + 2 x 20H inductor. Regulation is done by FET with temperature compensating precision reference, protection from shorten circuit / load faults. No hum or fuzz can be measured in the anode voltage.