Proton used to have products very closely related to the NAD classics. They had a 40 watt reciever, the 940, with a schotz tuner and 6db of headroom. They also made a very good integrated amp and seperate tuner. Then they came out with a power amp (the AA-1150?) that was a quiet dual-mono powerhouse with beautiful anolog meters. It's dynamic headroom was something like a whopping 7.3db! They made excellent (in my opinion) products in the mid 80s (my heyday).