I am trying to understand the role of the negative feedback resistor in a Fender 68 Custom Princeton Reverb Reissue amp. It has a 5.6k resistor in R10 which is the negative feedback resistor. How would a lower value resistor (like the 2.7k I believe is in the original Princeton Reverb) impact the noise floor? I am under the impression that more negative feedback means (a bunch of things, but I am concerned with background noise, hiss, etc.) less noise. If more neg. feedback equals less noise, then a lower value resistor would cause there to be less noise, and a higher value resistor would mean more noise??? Or do I have this backwards? Thanks in advance for setting me straight.