Tube amp care

Tube amp warranty explained: what is usually covered, why tubes are excluded, what to ask about repairs, and how Kool's warranty with no time limit works.

A practical tube amp maintenance checklist: what to check every time you play, every few months and every year or two, and what to leave to a technician.

How to transport a tube amp without damage: let the tubes cool, secure it in the car, avoid cold and damp, and pack it properly for shipping.

Tube amp biasing explained in plain English: what bias does, how hot or cold bias affects tone and tube life, and when new power tubes need a rebias.

When to replace amp tubes: the signs of worn power and preamp tubes, how long they usually last, and why a matched spare set saves you a trip to the tech.