Since I have been greeted with silence... I have done some tube-rolling in the BAT!
(Warning, I do not think VK approves this)
I have tried generic-russian 6N6P tubes with good result, and now playing with 6N23P (= russian 6922).
This may be stretching my luck, as they have 135V on anode/1,7V cathode. Also sound great!
Last; swapped the central current-source-board for 2 x 6C3n-EB (= russian 5881/6L6GC)
(Warning, I do not think VK approves this)
I have tried generic-russian 6N6P tubes with good result, and now playing with 6N23P (= russian 6922).
This may be stretching my luck, as they have 135V on anode/1,7V cathode. Also sound great!
Last; swapped the central current-source-board for 2 x 6C3n-EB (= russian 5881/6L6GC)