Huge resistance bottleneck which robs low level detail as well as grunge noise especially low level.¿Que?
Littelfuse spec 5A 250v Slo-Blo 21.4mΩ
Measured 22mΩ with precision supply and resistor divider @ ≈115mA
Measured R after 10 minutes at each current.
0.55A 31mΩ
1.10A 31mΩ
2.20A 31mΩ
Power Transformer input Z ≈100Ω. Fuse is 0.023% of input Z.
Please explain how ZERO change in fuse characteristics can rob low level detail.
Crappy holders in harsh environments can create ugly artifacts. Ditto poor quality or wrong characteristic holders or fuses.