At your own risk.
For example electronic battery organs.
Inserting the batteries and when the last one is connected, it is disconnected immediately. This avoids destroying the electrolytic capacitor which may be in parallel by charging it too quickly after it was discharged for so long. Electrolytic capacitors have memory. We have to give it time for the dielectric inside to reform.
After playing with the last battery in and out for a while...
When all batteries are in the switch must be pressed momentarily in and back to off to protect all the other electrolytic capacitors in the instrument.
After waiting for a few minutes. Back to on for a little longer etc.
If a synth like a Siel DK70 is to be powered by an external cable a series resistor of 10Kohm can be connected to slowly reform the shunt capacitor.
On tube equipment a 1 Megohm series resistor can be used to slowly reform power supply capacitors by taking all safety precautions. See other euroelectron posts by Google search.
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