I decided to try an Antek smoothing choke in a capacitor HV tube power supply, roughly 3H with maybe a max of 300 mA.
A 5AR4 will be followed by a 47 MFD cap, and then the choke before another (larger) filter cap.
I have limited space on the chassis. I can install the choke with or without an external metal shield.
Here's my question: Can I locate a fairly high gain signal tube about an inch away from the unshielded toroid, or will it likely pick up hum?
Thanks in advance.
A 5AR4 will be followed by a 47 MFD cap, and then the choke before another (larger) filter cap.
I have limited space on the chassis. I can install the choke with or without an external metal shield.
Here's my question: Can I locate a fairly high gain signal tube about an inch away from the unshielded toroid, or will it likely pick up hum?
Thanks in advance.
Don't do this.
Toroid inductors disturbance space like a donut, without proper shielding radiates strongly.
Toroid inductors disturbance space like a donut, without proper shielding radiates strongly.
euro21 is right. There was a post somewhere here where a new member had glued two toroidal chokes together to save space. Very bad idea...
Thanks for your replies. I decided to mount the choke with a shield and I hope that will suffice.
“Square” toroids cast a big bubble-like EMF field. Sure, because those are much more economical to wire. There is no electromagnetic reason that toroids can’t be other proportions.
I was running some rough models of non-traditional configurations of toroid cores to try to minimize the “square bulk” of the output transformers for a tube amplifier design. Now, I didn’t build these, but they spec’d out correctly. Toroid cores can be ganged, of course. Stack up 8 one-inch high-permeability toroid cores and you have the core of a very nice output amplifier. Which just happens to be half the width of a rack mount chassis--one for each channel.
My point being, commercial toroids have to compromise on dimensions due to winding cost. You can build a toroidal inductor or transformer in pretty much any configuration.
I was running some rough models of non-traditional configurations of toroid cores to try to minimize the “square bulk” of the output transformers for a tube amplifier design. Now, I didn’t build these, but they spec’d out correctly. Toroid cores can be ganged, of course. Stack up 8 one-inch high-permeability toroid cores and you have the core of a very nice output amplifier. Which just happens to be half the width of a rack mount chassis--one for each channel.
My point being, commercial toroids have to compromise on dimensions due to winding cost. You can build a toroidal inductor or transformer in pretty much any configuration.