Excellent upgrade, but not worth it in a combo
Made a Marshall Origin 50 sing like never before. Unfortunately instantly triggered microphonics at low volume level with a Telecaster. Tube dampeners wouldn't work. Expected a little more, but the microphonics are just the same as the original Marshall JJ's. Some people say tubes don't improve sound, but comparatively to the original Marshall JJ's in the Origin the amp sounds creamier and fuller, punchier without muddiness. Back to lugging around a head and cabinet in lieu of an easier option or playing extremely loud with a combo. Fantastic tubes, not recommended for a combo.