Unit is in Excellent Condition!
A hybrid preamp that uses a single 6DJ8 tube and FET devices, the LS2 is one of the preamps that helped define Audio Research’s reputation as the premier tube electronics manufacturer.
So the LS2 is a hybrid, all solid-state save for a 6DJ8 (ECC88) dual-triode. The power supply is all solid-state, while the rest of the audio circuit is of the FET persuasion.