I have replaced the stock Tungsol 6L6 tubes with two matched Tube Amp Doctor 6L6WGC - STR...
Wow what a difference
the amp now sounds way bigger than before, and is more detailed in both bass, middle and treble frequencies. A lot more head room than the tungsols and also more power...
These valves is definetly worth a try
just my 2 cents
Thanks for the info. I mentioned these in another post. I recently put Tungsol 5881 in my OTS with positive results and, based on previous experience, I thought the TAD 6L6WGC STR might provide the same advantages of the 5881 but with greater musicality. It sounds as though you have confirmed that.