September is here, so it is officially autumn and time for big and not properly thought through projects! I've been thinking on and off for a while about doing something with voltage regulation. I know common sense dictates that you design the output stage of the amplifier first, but I feel like starting in the other end. I want to build something with a tube regulated power supply, so that's where I'll start.
After looking at plenty of similar designs, this is what I've come up with:
A 6080 tube can pass plenty of current and since it's dual the two channels can be separated already at the power transformer. The ECC83 is also dual, and high gain enough to control the pass tube. The potentiometer sets the output comfortably to 250V-300V but can probably go a bit wider if the input voltage is not too far off or too close. I could claim that the 0B2 is chosen for stability and not the fancy color but well...
I've run some simulations in LTspice and it seems to work like I intend it to, with proper line and load regulation. The output should bee good enough to drive a pair of push-pull EL84 or maybe something even bigger.
Assuming there will be some slow days at work I will make this thing happen before the winter holidays. By then it will be cold and not a problem to light up a small army of tubes.
Any thoughts or advise is highly appreciated!
Olof