Also barely to believe. Due to it's high conductivity a copper WW resistor needs a large turns number to achieve some certain resistance. Hence there's a huge parasitic inductance with them. Maybe he just likes the sound of resonant circuits in the cathode lines?
Best regards!
Best regards!
He also technically measured it. I remember it made it out through the audio band. Self inductance was more problematic, leading to an increase of impedance at HF.
Bingo! That's exactly the reason for different sound! The tubes' operational points vary with frequency. But who really wants this?
Best regards!
Best regards!
This is the reason why designers use only non-inductive (Ayrton-Perry) wirewound resistors in the cathode, even if blocked with capacitor.
I was wrong,
The resistor author claims to have them wounded non inductive, in a bifilar anti phase way I believe. On his article cited by Rob, he claims it and describes measurements of a capacitive roll-off
hifi heroin: The worst resistor ever?
Not a pain when the cathode is bypassed, which is the case in Rob's schematic, by a 100uF
So there shouldn't be any resonances or phase shifts.
Best regards,
Alexander.