Tube Amp Archive

I going to build a hifi amp. Thanks for your help. I think carbon composition or carbon film is a good option for me.

I'm looking at selecting resistor for my simple audio amplifier project i'm building, but i'm not sure what type of resistors to use, I already found quite some information about resistor types , however i'm still not quite sure which to choose. Metal film seem the best choice at this moment. Can so...

7809 input voltage should be greater than 11V otherwise it will not operate properly.