Here's what fell into my lap:
Heathkit WAP2 PreAmp
Pilotone AA920 Amplifier
Sherwood S3002 Tuner
Eico HFT90 Amp/Tuner
Sherwood S4400 Integrated Amp
ElectroVoice EV1159 Tuner
Bogen DB230 Integrated Amp.Anything I should do before plugging these in? They all appear to be in fine condition. I don't want to lose tubes accidentally. Most of my experience is solid state. And what's worth refurbing?