Hi Pete.
Nothing should happen if You connect the input to ground. That just means 'no signal'.
If You want to protect Your amp against overvoltage, just connect two zenerdiodes (i.e. 5,6V) back to back between the input and ground, then any voltage exceeding 6,2V will be removed. That's the simplest and cheapest way to do it.
If You want to protect Your amp against DC, then put a capacitor between the input-socket and the amp-circuit, but check out that there isn't one allready.
Nothing should happen if You connect the input to ground. That just means 'no signal'.
If You want to protect Your amp against overvoltage, just connect two zenerdiodes (i.e. 5,6V) back to back between the input and ground, then any voltage exceeding 6,2V will be removed. That's the simplest and cheapest way to do it.
If You want to protect Your amp against DC, then put a capacitor between the input-socket and the amp-circuit, but check out that there isn't one allready.
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