TECHNICS SL1200/SL1210 NEW LINEAR POWER SUPPLY

The SL-1200 has three problems with its power supply and regulator a) the transformer mechanically hums and this is audible through the cartridge, b) the transformer has an electromagnetic field also audible though the cartridge, and c) the existing power supply dips on some motor demands giving variable and poor dynamics to the feedback system. The internal regulator is way short of gain, so in fact it doesn't really regulate much at all. The motor often demands more current and the existing regulator responds by dropping the voltage. The photo shows one of the two boards of the new PSU.