It came out of a Lafayette LR 300. I know nothing of this unit except rumor and rumor says the PT was sourced from Thorardsen. The three reviews I could find of this amp were very complimentary; not that that means much. I may send for the service manual; Tannenbuam has it. I know it used 12ax7's in the pre-amp and 6bq5's in the power stage and 6au7 as phase splitter.