straightaway

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High powered single end 300b recommendations
You might check out Manley. They have 300b mono’s you can switch between SE and push pull, 12 and 25 watts, respectively. They have a 300b pre, as well.   
Time to upgrade the pre-amp.
If you decide to go the vintage route, I had my SP11 Mk II refurbished by ARC just last year. Cost about $1k all in, including new tubes and shipping. It sounds fantastic, and was well worth the cost, in my opinion. Though, I haven’t heard the oth...