I suggest u call Andy at Vintage Tube Services and speak to an expert.
It sounds like Mullard may be what you need, he can tell you about the sonics of the 6922/E88CC Mullard vs. other brands. But premium tubes are not cheap.
It sounds like Mullard may be what you need, he can tell you about the sonics of the 6922/E88CC Mullard vs. other brands. But premium tubes are not cheap.