Carrying out a service on an amplifier is much like looking after and servicing your car. We can check the internal condition of the PCBs, components and general operation including valves.
Heat can cause a big problem in amplifiers, power supplies and in fact all electronic devices.
Heat can be caused by and cause drift on tolerances, component behaviour and complete failure as well as sound difference on solid state amplifiers.
We now use thermal imaging to show us component temperatures speeding up amplifier repair and ensuring that we get right to the root cause of the issue!
Regularly checking of valve biasing can avoid an amp being continually overloaded and stressing the amp out. This resistor had burned and blew as a result of the valves going short and damaging. The remaining valve was very worn, with regular maintenance and servicing the valve should have been changed quite a while ago!
Capacitors can dry out over time, however can progressively age quicker due to heat. In Electrolytic capacitors the electrolyte is a liquid and can boil and expand under stress, either heat, drying or excessive voltage. The picture shows a raised top of this capacitor, due to the deforming of it the foil had shorted causing a short across the power supply. If this had not been discovered sooner it may have exploded, though not terminal would have created lots of white smoke. Regular servicing could identify this before it becomes close to irreparable damage. Book in your equipment now to avoid a potential failure!