A set of Heathkit's mono preamplifier and Knight's mono power amplifier. I obtained them at auction. There are no problems with their use. Operation has been confirmed, including the phono stage. (I think it's best to connect the GND to the chassis fixing screw.) The WA-P2 is powered from the power amplifier. The Heathkit does not have a logo plate, and the knobs have been replaced. Both are valuable antique amplifiers from the mono era, and I think they will be easier to handle for those with some knowledge. Thank you.