(1 set of 10 tubes) 448A Western Electric "SMOOTH TOP" used/test like new/85-95% output with "D" getter 1960-1971
$399.99
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1 set of 10 tubes) 448A WE "SMOOTH TOP" used/test like new/85-95% output with "D" getter 1960-1971 $399.99 for 10 tubes Tested on Amplitrex 1) 25ma Gm=25,500 1) 23ma Gm=25,600 1) 26ma Gm=24,000 1) 23.2ma Gm=23,500 1) 27ma Gm=24,600 1) 25.5ma Gm=23,600 1) 27ma Gm=24,600 1) 22.6 Gm=25,300 1) 26.2ma Gm=29,100 1) 25ma Gm=25,000 Vplate=135V Vscreen=135V Vgrid=-2 Good Ma range 20-30ma Good Gm = 23,000 - 27,000
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