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VT-25-A is WE VT-25

We can find discription on 396A/2C51 on Bell Laboratories Record vol.25 No.9 1947.
Miss Assunta Sciarillo was performing delicate welding operation
and Miss Blanche Russielo was spraying cathodes.
You can make tiny class AB1 PP amplifier with 396A.
Ep=300V, R cathode=800ohm, Ip=4.7mA, Ipmax=6.0mA, Rl=40kohm
Output=0.95W, total distortion=10%
 
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