I THOUGHT Dolby B reel-to-reel reference level was the same as Dolby A...but I could be wrong...at 185nWb/m...this is "Ampex Operating Level." A good resource for things like this is the MRL Web site. http://www.flash.net/~mrltapes/ My experience with the Advent units is that the pin/socket connectors became noisy. The AN-180 Teac that I have seems to be performing as well as the day I got it in 1975 or so. Cheers, Richard At 08:15 PM 4/18/2003 -0700, you wrote: >IIRC, the Dolby B reference level was 160 nano-webers/meter.