Testing tubes

[radio63]

Substitution. Remove one tube at a time and replace with another of the same type. Try the set and if performance is greatly improved, likely the tube you have just swapped out was weak or bad. Turn the power to the set off and unplug each time you swap tubes. If no difference was noted, put the old tube back. Do only one tube at a time or else you might get mixed up. This works best for tubes in the RF, IF, and audio sections of a radio, and power suppiles where the rectifier has died due to old age. One caution, if your set has B+ problems such as shorted filter caps, no matter how many rectifiers you install, they will keep blowing until the cause of the circuit problems are resolved. Beware.

Gilbert