This listing is for one good used and tested good, Fisher OUTPUT TRANSFORMER from a 800 Receiver ( also known as Fisher TA-800 ) .This output transformer is used for 7591A  output tubes ,so maybe it can be used for other Fisher 7591A output tube amps such as the Fisher 800B and 800C.The Fisher part number is  T806-127.This is for the output transformer only ,no tubes or receiver are included in this listing.  USPS shipping is $17.International shipping is $39.