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.
Unfortunately, not in this case as space is pretty tight. Fortunately, this is for a guitar amp so a bit of noise is fine. But, if one must choose one way or the other, which does the least harm