Best ferrite core and its source

[hanair]

What is the best ferrite core for medium power SMPS, 100-300W - mainly for audio amplifier purposes?

I was looking at EI-33 and came across the following seller:
http://www.aliexpress.com/item/Ferr...-thermal-whosalesale-50ses-lot/559078667.html
Do they look good or should I be concerned about the quality? There are others selling similar stuff for under a dollar when bought it bulk.

Thanks for you comments!

 

[MicrosiM]

What is the best ferrite core for medium power SMPS, 100-300W - mainly for audio amplifier purposes?

I was looking at EI-33 and came across the following seller:
http://www.aliexpress.com/item/Ferr...-thermal-whosalesale-50ses-lot/559078667.html
Do they look good or should I be concerned about the quality? There are others selling similar stuff for under a dollar when bought it bulk.

Thanks for you comments!

EI33 can deliver 300W at 90KHz, easily

 

[hanair]

I think it would be easier to wind on a round core. Any suggestion for a rounded center core, which can equal or better EI33? I am looking for EI configuration with the center core rounded.

Thanks!

 

[szhighstar]

I think it would be easier to wind on a round core. Any suggestion for a rounded center core, which can equal or better EI33? I am looking for EI configuration with the center core rounded.

Thanks!

EI33 PC95 core is ok