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.
As all owners of this amp know, the sockets are recessed so deep that putting in a tube with a wider base is impossible, unless you remove the cover. But you have exposed guts and it isn't sexy. Are there socket risers that go above the cover? Links?