I am building a tube amplifier, and have decided to add a 5ch EQ to it. Historically, the ones used in guitar amplifiers were all passive RLC filter style systems, with large inductances of 0.5 - 2H for the 80Hz channel.
I know now days it would be smaller to use an active op-amp style, but I am doing this as a hobby and want to try making a passive one. I was slightly surprised to find Digikey does not carry any small inductors over ~100mH. My guess is this is because no one uses them for small current applications anymore with the advent of DSP or active capacitor based filters.
Any advice for creating large 1H inductors with <1mA of current that does not involve winding 300 turns through a 1" torroid?
Or does anyone know how they were historically made, really fine wire i would guess with many turns?