I would have done the same, the only thing is these valve amps sound best when pushed a bit. I played a gig last week with a 30w head and it was pretty much maxed out on the edge of distorting and it sounded fantastic. Ditto with my 100w amp, it’s usually a bit beyond noon where it sings . I don’t think you’re gonna get that “verge” sound form a CTM300 without breaking windows 😆, or at least annoying your band mates. But what a 300w valve head will give you is oceans of deep deep clean warm bass .