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RE: 4P1L preamp DIY

'The reason for the better sonic results with the choke, probably stems from the reduction in the upper harmonics, from say the 20th and beyond.'

I really have no idea how you come to that conclusion regarding high order harmonics although I can take measurements using a wave analyser or FFT if need be . In terms of measurement , I do not posses a DVM with the sort of resolution to take such measurements so an HP mV meter was used

As for the rest in cut and paste format . There is no feedback in the filament supply . This consists of LCRC to a Coleman reg (buffered CCS) taking the cathode connection from the 4P1L filament centre tap

George



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