This listing is for a CBS Audimax RZ Compressor/Limiter/AGC. This is a classic broadcast unit based around the famed 6386 vari-mu tube. The 6386 tube in this one is dead,,so you will need a new one..All of the other tubes light up though.It was working good until the tube went,,then it sat for about 10 years so it might need some capacitors replaced too.I remember this thing sounding really good,Shipping will be the actual cost,,ignore whatever ebay came up with,,,this calculator just dont work right.