There are a few Rogue Mag 99 preamps for sale. I prefer the sound of the 6SN7 tube versus 6DJ8/6922 tube sound. I recently installed a few of the 6SN7 NOS tubes that I owned in a friends Rogue 99 and the preamp became very musical over the stock 6SN7 tubes he was using. The CBS 6SN7 GTB tubes are cheap and work very well in the Rogue. I have never owned a Rogue product.
