I bought this a few years back for fattening up my recording mic. It helped a little, no big deal. No Avalalon but did fatten the sound a bit. But I got to thinking, could I use it as a tube pre-amp for my PV solid state PV guitar amp that's been sitting in the closet? Holy mackerel!! Now I have an 85 watt hybrid that sounds as good or better than my Vox or PV Classic 30 tube amps for chump change. If you upgrade the Chinese 12Ax7, be very careful not to open the top all the way or you will break the ground connection and render it useless. I'm still in awe that for the first time ever, my SS PV that I couldn't sell for a $100, is one of the best sounding amps in my arsenal.
Boca Raton, FL