The high dissipation Super TnT produced 845W are actually far rarer than any NOS due to the extremely small run which were produced.
They also sound significantly better in my amps.
I have an octet which will only be prised from my stiff cold hands !
I also have a quad of the superb high dissipation Super TnT 845M which were also produced in extremely low volume.
Don't confuse the above types with the inferior Shuguang variants which have perforated plates and are commonly found, also sometimes branded Sophia and/or Golden Dragon.
Other than the above tubes, unless you know the operating points of your amp and can adjust them, I'd suggest to stick to the standard Shuguang 845 B which is a decent sounding, reliable tube.
You may actually find that experimenting with different input & driver tubes achieves quite a pronounced variation in sonics.
They also sound significantly better in my amps.
I have an octet which will only be prised from my stiff cold hands !
I also have a quad of the superb high dissipation Super TnT 845M which were also produced in extremely low volume.
Don't confuse the above types with the inferior Shuguang variants which have perforated plates and are commonly found, also sometimes branded Sophia and/or Golden Dragon.
Other than the above tubes, unless you know the operating points of your amp and can adjust them, I'd suggest to stick to the standard Shuguang 845 B which is a decent sounding, reliable tube.
You may actually find that experimenting with different input & driver tubes achieves quite a pronounced variation in sonics.