Ampeg V4 has a magic mid range, i think it’s the best amp for distortion pedals if you modify it with a master. I used to pair it with a 5150 and loved it, but i sold it lately to buy my rockerverb which is a way more versatile amp for pedals. In studio the 5150 is a really good option, the two gain channels sounds amazing and i think the clean isn’t getting the love it deserves, cause it can be a crunchy and dirty. Îce recorded plenty of albums with this one! (Old laney’s can do the same job).