[Amps] 160M PI network Toroidal Coil

[Paul Baldock]

I'm going to convert a SB221 to a single band 160M amp. It seems most 
of the amps these days use a toroidal coil for the 160M Output PI 
network. Does anybody know what cores are typically used for the 160M toroid?

Thanks

- Paul   KW7Y