What came with it are
4 SHUGUANG 300Bs
1 SHUGUANG 274b
2 6n6p looks like russian nos
what should i try next?
Do you need to go Balanced or can you go SE for the evaluation of tubes?
Where are you located?
Maybe another Lampi geek nearby could lend you a pair?
I love the KR RK 242 output tubes if your preamp/system can handle the high gain. If not, the KR RK PX25 are a sure bet.