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211D Western Electric brass base like new in original box 1920's (reference picture)

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sold) 211D Western Electric brass base tests like new and probably is NOS in original 211D box with 211D data sheet from late 1920's

 

Tested on Amplitrex 

Vplate=500VDC

Vgrid=-1VDC

Iplate=109ma (strong Ma and tube has zero gas)

 

211D NOS Good Ma range = 100-120ma

 

Recommended for

SET amps under 1000Vplate

 

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