Product information "Psvane ACME 2A3 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.
 
Maximum Rating
Ua…………………………    300         V
Pa…………………………    15           W
Rg
with cathode bias………      0.5          MΩ
with fixed bias…………       0.05        MΩ
Direct Interelectrode capacitances
input……………………       7.5           PF
output……………………     16.5        PF
grid to plate……………       5.5           PF
Static parameter
Ua…………………………   300          V
-Ug…………………………  45            V
Ia…………………………     60           mA
Gm…………………………  5.25        mA/V
ri…………………………      0.8          kΩ
μ…………………………       4.2
Pout………………………… 3.5         W
Recommended Operating Conditions
 (reference value)
Class A1, single tube (fixed bias)
Ua…………………                250          V
-Ug……………………          45            V
RL……………………           2.5           kΩ
Ia(0)…………………            60            mA
Gm……………………          5.25         Ma/V
ri……………………              0.8           Kω
μ……………………               4.2
Pout……………………         3.5          W
Dtot……………………         5              %
Class AB1
                            push-full (fixed bias)
Ua……………    300              300          V
-Ug……………  62        Rk=780Ω V
RL……………   3                  5               kΩ
üg(pk)………     87                110          V
Ia(0)…………    80                80            mA
Ia(max.sig)…    140              100          mA
Pout……………15                10            W
Dtot…………… 2.5               5              %