[Amps] 2 x 3-500Z filament choke

["Iain" <iain@g4dpf.co.uk>]

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

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