Hello users, I'm new to the world of monster receivers. Just picked up myself a 1500 and in the past I've owned 5 other pieces of project one equipment. Such as two 800s, mark iib, iic, and now the holy grail Mark 1500. If anyone needs help with the meters i can help. But I'm conducting research on how many were produced throughout the production years of 1980-1983 I believe. If anyone can share their serial number it would be most helpful. So far I have 69,883, 69,946, and 75,294. If anyone has info it would be great. Thanks!