I urge readers to read the entire design process first and then go back and look closely at the math. I will first present the process for each step and then fill in some numbers to show how the process works. ![]() It's a stereo single ended class A design I'll refer to as the Ghost amp. I am going to work through the procedure by designing a supply for a mythical low power stereo amplifier. So if you can figure out how this resistance acts at your planned load current, you can get your power supply design just right. The entire process relies on assuming that the rectifier, when conducting, acts like a resistor. Even those builders who are unfamiliar or uncomfortable with advanced mathematics should have no problems using this approach. This process uses only simple equations and Schade's original graphs as modified by Reich. As such, I will present again, a somewhat modified version of this process more suited to today's amp builders and hobbyists. Now, the state of electronics has changed somewhat in the 67 years since Schade first published his landmark work. In 1943 and presented in a slightly modified version by Herbert Reich 2 in 1944 in his book "Theory and Applications of Electron Tubes". What I'd like to do here is to walk through a design process first recommended by O. ![]() Reich), we don't even need to tackle any advanced math or taxing mental gyrations to arrive at some truly excellent power supply designs. And, if we rely on the excellent work of those who've come before us (O. The design of basic tube power supplies is actually very straight forward. The truth is, there is no reason to suffer power supply set backs like this. It's at these times that I always wish I had taken a little more time to get it right. Other times I end up with bad voltages, unacceptable power supply sag, channel crosstalk, or worst of all, a hum that I just can't seem to eliminate. ![]() Sometimes things turn out ok and there are no problems. Sometimes I get excited about my latest circuit and after looking for just the right tubes, output transformers, coupling caps, and low noise resistors, the power supply design becomes almost an after thought. It's time for a little confession: I don't always spend as much time on my power supply designs as I should.
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