I bought two 990C opamps
I bought two 990C opamps to swap with the x18 opamp that comes stock with the Warm Audio Tone Beast. I did this "mod" myself, had to carefully pull off some epoxy but it was otherwise very easy. I am an EE and have trust in the 990 design (read Deane Jensen's original AES paper if you are interested) but no real issue with the stock. Worth the ~$50 for each opamp from Zen Pro Audio, in my opinion--> they got it out quick and shipping was free. Thanks!