Help: Re tubing Jolida JD 1000

Thanks for the response Al. I think the factory tubes are Chinese, they are unmarked. What I would like to achieve after re-tubing is greater dramatics, if possible. The mid?s appear to be muddy and lack punch. The bottom end is at present is fine by me but to my ears the middle section needs the most improvement.

Present tubes are:

4 matched pairs of 6CA7/EL34
1 matched pair of 12AX7
1 matched pair of 12AT7

Thanks everyone your responses are greatly appreciated.