Something that I do on my power supplies from time to time is run the center tap through the choke then attach to the ground bus. It has the same effect as placing it on the high side, but there's less potential on it and less chance of failure. I do see other schematics with their chokes on the low side here and there. Just something to consider.
I found out the hard way that caps can remain charged for months without a bleeder resistor. I was going to change tubes on my 35 year old vtl preamp that had not been used for 7 or 8 months. I accidentally touched something and got a heck of a shock.
If the HVDC comes up slowly like that, why does it matter what order the capacitors are connected? How would connecting the large cap first put strain on the rectifier tube?
Because there is more to this than the inrush current people focus on. A high value first capacitor overheats the rectifier and the power transformer. ua-cam.com/video/Iizt5cnq2oY/v-deo.html
Something that I do on my power supplies from time to time is run the center tap through the choke then attach to the ground bus. It has the same effect as placing it on the high side, but there's less potential on it and less chance of failure. I do see other schematics with their chokes on the low side here and there. Just something to consider.
I found out the hard way that caps can remain charged for months without a bleeder resistor. I was going to change tubes on my 35 year old vtl preamp that had not been used for 7 or 8 months. I accidentally touched something and got a heck of a shock.
Looking on the bright side, you only die once 👀
Yup, a bleeder resistor is just a must have part IMHO. I also believe they help stabilize the voltage.
Great video and sharing important insights. That capacitor could be nasty without your modifications.
It is a killer in disguise!
Adding bleeder resistor now (well, tomorrow 🙂). I like how you modified the PS but I have a (new) original 20,20,20,30 uF can cap.
bleeder resistor is also use in class AB amplifier good idea 😊
Yes, a bleeder resistor is a good idea in any tube amp circuit!
Looking really good
If the HVDC comes up slowly like that, why does it matter what order the capacitors are connected? How would connecting the large cap first put strain on the rectifier tube?
Because there is more to this than the inrush current people focus on. A high value first capacitor overheats the rectifier and the power transformer. ua-cam.com/video/Iizt5cnq2oY/v-deo.html
@ Thanks! I’m an EE with 40 years of experience; never learned the subtleties of tube rectification. 😁
I'm pretty sure cap size can cause transformer over heating with SS rectification too.
Im still watching
I would also recommend wearing gloves when working with a powered-up amp.
Not a bad idea, also make sure you are wearing rubber sole shoes! Further protection is an isolation transformer.