Multiple 300B tube manufacturers on a same amplifier

[Musicinn]

Any guru can further advise any harm to a parallel single ended amplifier with 4 different 300B tubes brand? 

 

Anyone try to tube roll on this way?

[S1chen]

Definitely not a way to go unless you dont care about sound at all. It is like installed 4 different brand and model of tires on a car. It can move around, but when come to performance, it will react strangely.