For sale is a pair of Herron Audio mono power amps. These amps have M150 face plates, but have been fully upgraded by Keith Herron to M1A status. The latest upgrades were just installed a few weeks ago. I also purchased brand new double shipping boxes with the last upgrade. Herron Audio can confirm the upgrade. I've listed the condition of these as a 7 because there is a scratch on the top of one of the amps towards the back and a very minor one on the other. The face plates are fine- I would say an 8. The rating is only cosmetic. Functionally, these are perfect. As I stated, they just came back from Herron with the latest upgrades. Each amp has its own shipping box, so shipping reflects 2 boxes. Serial numbers are 058 and 059. Paypal users add 3%.