For your consideration, we have a Fisher 70AZ Tube Mono Amplifier with the Z-Matic Control. The amp is being sold as is and for refurbishing. The unit looks to be all original, aside from the power cable. The original power cord was cut and spliced, so we installed a new cord. All the tubes tested strong on our Amplitrex AT-1000 Tube tester. The rectifier tube is an RCA 5V4, the power tubes are Tung Sol 5681's, the 12AU7 is RCA, and the 12AT7 is a GE. The unit was brought up slowly on a variac and dim bulb in order to reform the capacitors. We then ran music through the unit, and it sounded very good. To be clear, this unit is being sold as is and needs to be refurbished.