What are the keys to maintaining good vintage amplifier operation?
A6-1: There is really only one key! Healthy capacitors – especially the electrolytic capacitors in the power supply! If these parts fail, they can short out the transformer (on units so equipped) and burn it up. The transformer may not be replaceable and is very expensive if a replacement can be found. Capacitors are like bread – they become stale if they sit around. So replacements should always be of recent manufacture as these parts have a shelf life. Purchasing capacitors may at first appear to be a problem as the values made today are not the same ones as 30+ years ago. Fortunately, it is not a problem as long as the following three rules are observed: 1. Capacitance values should be close. For example, a 33uf will work where the original is a 30uf. 2. Voltage should be the same or greater. For example, a capacitor rated at 250 volts can be safely replaced with a capacitor rated at 350 volts, but not one rated at 125 volts. 3. Make SURE that you are buying the right type of capaci
