[Amps] 2 x 3-500Z filament choke

[Iain]

Hi All

 

I am gathering the parts to build a two valve 3-500Z linear amp.

All the suggestions for the filament choke seem to be to purchase from RF
parts or surplus sales in the USA.

I haven't been able to find any info on winding a homebrew one.

Is there something really special about the core or will any ferrite rod do
?

Any info on wire size and the number of turns would be very useful

 

Thanks Iain G4DPF