I have a fairly modified Mingda MC34-AB valve amp that I have tried a few different valves in both NOS and new production. I run a pair of Mullard ECC35 tall bottle brown base in the input stage as well as some Brimar 12AU7's. The Mullards are considered to be holy grail valves and for good reason they are very clean and open sounding with huge soundstage. I like them so much I bought a mint second pair, very expensive but worth every cent in my opinion. I run 8 x Svetlana Winged C new production EL34 valves in the output stage which I am very happy with. Having said that all the caps/resistors have been upgraded and I use these big old vintage chokes and the amp has been completely re-wired point to point with nice 7N copper solid core.
I would run some quality NOS output tubes but the cost x 8 would be huge!
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