Hi All,
First of all thanks all for the support received here. I know sometime some excessively lighted up discussions occurred but overall so far I have accepted all the advises, suggestions, your proposed even if sometimes those were given a very direct harsh way. I think I understand now how it works on this forum.
The direct approaches overall has pushed on squeezing brain thinking logical rather than copying a DIY build out of step by step instructions and pictures.
For example I understand now a lot more about capacitors, resistors their purposes and the utilization at specific places but also how really dangerous can be if something isn't done correctly like caps explosion and so on so forth.
Now the question:
I am reading the Design tube Preamps for Bass and Guitar.
I am to the point about Resistor Noise
I was aware already about Resistors Carbon Composition to produce noise, therefore on modern design, this something I was told on a different Forum, to avoid as much as possible Carbon composition.
reading the advised book now, the same is mentioned at page 62
It says: Specifically that Carbon Composition should be avoided in the input stage.
I have looked at original circuit such 18 Watts or even Fender Simple Circuit 5F1 and I see basically Carbon Composition being used as the only resistors type except for a couple of Metal Oxide but those are not at the input stage.
Therefore I would assume that turning on an Amp like that would produce all kind of cracking noise and hum?
There are today a lots of American Kits such the one from Stewmac or Mojotone that still uses Carbon Composition.
At this point I bet that utilization of Metal Film is simply the easiest way to avoid such issue?
So back in the 60s those amps had a lot of hum noise? I have an Amp in Italy that is an Original Fender Champ 5FE it was refurbished since it is from the 70s or around that period not sure exactly and in fact it makes a lot of noise when turned on.
So can we really say that Carbon Composition resistors should be avoided?
Thanks