I picked up the first production NOS 1950's black base Mullard GZ34 after the metal base was discontinued, and it sounds great!!!
I would never spend the $ some of these tubes are going for…I can almost buy my amp again for some of these prices!
You will definitely enjoy this tube, and especially for its price!!!
A few years ago I sold a Mullard GZ34 metal base for $150. Mistake? nah...
I liked the Sophia Princess 274b more.