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.
A question for people who have build a JE Labs 300B. Do you find it necessary to use a preamp to drive it to full power? Does it have enough gain to be plugged directly to a 1 or 2 V source, such as a CD player or DAC?