Up for adoption - four (4) HP 8557A (3) and HP 8558B (1) spectrum analyzers (photo attached). They are in varying stages of working/complete (except the 8558B which lacks a first converter module) and could make for interesting learning/project (with due attention to safety precautions working with electronics of the era.) Service/operating documentation readily available online. These can be delivered at no cost in Denver metro area, and are are offered without support/warranty. If you are interested (in all four as a group) please contact. 73 Dave WB0GAZ wb0gaz@...
