A:Answer Since you didn't specify which turntable you have, but you did say that it didn't have a pre-amp, I assume it is not an AT-LP60-USB, which is a widely used model. The AT-LP60-USB has a pre-amp. I don't know what amplifier you have, since you didn't specify that either, but if the amplifier doesn't have a pre-amp built in, then you need to buy a small pre-amp for the turntable because the actual signal out of the tone arm is very small, and you probably need to increase the strength of the signal going in to the amplifier. For specifications as to size, go the the manufacturer's web page; everything is there.