WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
I found this article in Glass audio,it says it sounds better than using a resistor as I/O converter.But I don´t understand how it works,what is the +1.25 and the -1.25 where is input, B+.
Anyone can explain this to me?