Lately I've been experiencing a pre amp gas attack after using a Tech21 RBI for several years. I now own and have been using use an Ashly SC40, Yahama PB-1, Demeter VTDB-201s as well as an MXR m80 and Hartke Bass Attack. I ordered new op amps for the Ashly, they came yesterday and I installed them; nice, easy upgrade. We had a gig last night and I was going to use it. I decided to A/B it against the RBI and, while I wanted the Ashly to sound better, the RBI was the winner. I had forgotten how good this pre amp is. Ended up using the RBI at the gig and got a lot of complements on my sound. The guitarist from my original project was there as well as a guitarist from a band I occasionally sit in for. These guys have heard me many times before and they thought it sounded great. Now I'm strongly considering selling the Ashly, Yamaha and Demeter.