Power supply chokes
Posted: Sun Aug 28, 2005 12:07 pm
Hello guys,
This is my first post here and I want to talk about chokes. I don’t have much experience with building tube amplifiers, but I’m having a lot of fun discovering how things work. From the Tube DIY asylum I learned that when designing the PSU, you have to keep the capacitance moderate, most prefer values below 100µF, even 50µF. On most designs, the values of the chokes are between 5H and 15H.
This leads me to the PSU design for my 300B amplifier as a CLCLC filter, build with GZ37 – 4µF – 10H – 20µF – 15H – 100µF. Nothing wrong with that.
Now let’s go crazy. Let’s design the filter as GZ37 – 1.5µF – 30H – 10µF – 40H – 40µF. This filter still gives good ripple rejection (even better), and it allows me to play with the first capacitor in order to get different voltages from the PSU.
So, the question is; What is the drawback in using “huge� chokes in the PSU filter?
Anton Dorrestijn
This is my first post here and I want to talk about chokes. I don’t have much experience with building tube amplifiers, but I’m having a lot of fun discovering how things work. From the Tube DIY asylum I learned that when designing the PSU, you have to keep the capacitance moderate, most prefer values below 100µF, even 50µF. On most designs, the values of the chokes are between 5H and 15H.
This leads me to the PSU design for my 300B amplifier as a CLCLC filter, build with GZ37 – 4µF – 10H – 20µF – 15H – 100µF. Nothing wrong with that.
Now let’s go crazy. Let’s design the filter as GZ37 – 1.5µF – 30H – 10µF – 40H – 40µF. This filter still gives good ripple rejection (even better), and it allows me to play with the first capacitor in order to get different voltages from the PSU.
So, the question is; What is the drawback in using “huge� chokes in the PSU filter?
Anton Dorrestijn