It is also dependent on how loud you play and for how long. Power tubes can last years in a light-playing situation while lasting only 6 months in heavy playing conditions. You might also need a new tube if you occasionally hear feedback from your amp for no reason. Your amp might need one or more new tubes if its volume, tone, or punch has gotten weaker. If the heated filament inside the tube glows orange like a setting sun, it’s usually a sign that the tube is healthy. Turn on the machine to activate the tubes, and look for an orange, red, or purple glow. Put the tube into your guitar amplifier, tester, or other tube-using machine. This is because the amp is still pushing out current at a higher level than the valves are able to take. If you changed to tubes with a lower resistance without biasing the amp you would quickly burn through those tubes and potentially damage the amp and yourself in the process. What causes tubes to red plate? What happens if you dont bias your amp?
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