Product information "Psvane ACME 211 Matched Pair in exclusive gift box"
Note from Manufacturer:
Based on the design of composite metal screen, the anode will be slightly reddish in operation. This is a normal phenomenon.
It takes at least 50 hours for the sound to gradually stabilize and it may take 150 hours or more to reach the state of perfection.
 
Static parameter
Ua--------------------------------------1250                V
—Ug------------------------------------70                   V
Ia-------------------------------------- 100                   mA
Gm-------------------------------------3.8                   mA/V
u(Ia=75mA)-----------------12
RL--------------------------------------7 KΩ
Pout------------------------------------10 W
Recommended Operating Conditions ( reference value)
class A(A-F) for two tubes：
                   typical working condition    limited parameter
Ua--------             750         1000      1250      1250    V
Pa----------------------------                           75         W
—Ug-----------    46            61          80                       V
Ug(pk)---------   41            56          75                       V
Ia(0)-----------    34            53           60                      mA
ri---------             4.4           3.8         3.6                     KΩ
RL--------            8.8          7.6          9.2                     KΩ
Pout-----------    5.6           12          19.7                   W