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
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