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've got 6 pairs of GE 5687 (5 stars)
but there are three differents pairs, because the stars are in white and green and red
is there a reason for the different colors,or ..............
White came with a standard consumer warranty GE offerd at the time. Red was a special distributor warranty. Green had no warranty and was sold to military, institutions, schools, etc.