[Amps] PL with toroidal core

[Luca]

Hi All

I homebrewed the power amplifier with the gu 78 .
 This amplifier utilize a PL tank circuit .
For increase the separation between L1 and L2 , I would like to utilize for L2 a toroidal core .
My difficulty is to select the suitable type  toroidal core for not  meet in a dangerous saturation .
This aplifier is measured for 5KW power out .
 Sure for your assistance , many thanks in advance and very good holiday everybody

Luca        ik5tsw at virgilio.it