Severe damage to output sections can arise when the amplifier is turned up too loud (usually the kids fault!), or briefly shorting the speaker leads with the amplifier powered on. This type of repair is the most expensive and obtaining parts can take a long time. It is possible to prevent damage by having the amp regularly serviced. We recommend that your Hi-Fi amplifiers are serviced every two years while pro models should be serviced once a year.
Other preventative measures include turning the amp off when moving speakers, keeping the top of the unit clean with a dry cloth, this ensures that there is adequate air movement around the amp.
HISS AND OLDER AMPLIFIERS
Over time, amplifiers can start to produce a higher than normal 'hiss'. This is usually caused by faulty or old filter capacitors. These capacitors come in many different types.
Vintage valve amplifiers and early transistor amps used a paper type of capacitor. These suffer from 'leakage', short, or open circuit problems. Modern aluminium types are better.
Replacement of the filter capacitors can produce amazing results.
See the Electronic Repair
page for more details.