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 have a B&K 700 and I've tried testing them with the same settings I use for a 6922. They read a little high because of the lower plate resistance. May not relate exactly to the TV-7 but it should at least tell you if the tube functions.