There has been an incident and I need advice

There has been an incident and I need advice

I was in the midst of upgrading my system to higher fidelity equipment. I had run a pair of Cerwin Vega D6s with a Carver M400 cube from a Nikko Beta 30 Preamp. All the equipment was circa 1978 or so :>). I listen mostly to CDs and selective rock FM. I am willing to go away from classic 2 channel equipment to incorporate HT but it is not required.

I first lost the carver and decided not to have it repaired. I replaced it with a Adcom GF 555 and then added a Velodyne SPL 1500 subwooker and I was really pleased. I had been looking at floor standing speaker upgrades. In trying to utilize the velodyne’s crossover I think I shorted the Nikko Pream at the plug and I was severely shocked and am terrible depression for no tunes.

Can anyone help guide me to a replacement preamp and make a suggestion on speaker upgrade. My budget can vary greatly but I don’t think I am yet ready for Krell or other, or maybe I am . I am not afraid of used equipment especially if the source comes from this board.

Thanks for reading and any input.