Description
(!!!) 211D=VT-4-B Western Electric nickel base used/60% mid-1920’s – reboxed (61.5ma)
211D=VT-4-B Western Electric nickel base used mid-1920’s – reboxed – some pitting / oxidation / blemishes on base – see photo
61.5ma (60%)
Gm=2900 (80%)
1 TUBE ONLY – NOT A PAIR
Tested on Amplitrex
Vplate=500VDC
Vgrid=-1VDC
Good Ma range = 100 – 120ma
Good Gm range = 3600 – 4000
Recommended for
SET amps under 1000Vplate