[Amps] Amp project help needed

[salers@hamal.freemail.ne.jp (Xu)]

Hi!
 I'm planing to home made a
RF power amplifier.But in
our country I can  not get Amidon's products(FT series), I can
get the  torid core, some of them ,can work in 0.5-30MHz,
but"Mi"is too low,only have50-100,not as FT series of Amidon.
my question is:
How can I 
I use them in HF power amplifier as transformer and
 LBF inductor replace FT and T series?
I think I can not use the brass tubes in the transformer 
of   HF power amplifier because of it
 has verylow Mi.
 Thanks in advance
         73! Xu