Many preamps have a mute feature when turning on. This is to prevent thumps in the speaker.
The usual procedure for any amp/preamp combo is to turn the preamp on first and let it sit for about 30 seconds prior to turning on the amp. This will insure that there are no dangerous thumps that could damage a speaker.
Many solid state amps have a circuit that detects residual amounts of DC at the input of the amp and will prevent the amp from operating until the DC is gone. This might be what is happening here. But some amps simply take a while to stabilize, and there are protection circuits to prevent DC at the output of the amp from getting to the loudspeaker. Depending on the design of the amplifier its not that odd to me that it might take a minute or two to operate the protection relay and begin playing. That's the click you hear.
The usual procedure for any amp/preamp combo is to turn the preamp on first and let it sit for about 30 seconds prior to turning on the amp. This will insure that there are no dangerous thumps that could damage a speaker.
Many solid state amps have a circuit that detects residual amounts of DC at the input of the amp and will prevent the amp from operating until the DC is gone. This might be what is happening here. But some amps simply take a while to stabilize, and there are protection circuits to prevent DC at the output of the amp from getting to the loudspeaker. Depending on the design of the amplifier its not that odd to me that it might take a minute or two to operate the protection relay and begin playing. That's the click you hear.