Stanford Research Systems, Amplifier, models:

BJT SIM911	Operation And Service Manual
SIM910	Operating Manual
SIM914	Operation And Service Manual
SIM918	Operating And Service Manual
SIM954	Operation And Service Manual
SIM983	Operation And Service Manual
SIM984	Operation And Service Manual
SR124	Operation And Service Manual
SR510	Manual
SR554	Manual
SR560	Manual
SR830	Manual
SR844	User Manual
SR86 Series	Replacement Instructions Manual
SR860	Operation Manual
SR865A	Operation Manual