(1 set of 10 tubes) 448A Western Electric "TIPPED TOP" used/good 75-85% with "D" getter 1965-1966

1 set of 10 tubes) 448A WE "TIPPED TOP" used/test like new 85-95% with "D" getter 1965-1966

10 tubes for $479.99

Tested on Amplitrex

1) 24.5ma Gm=24,500 (6552)

1) 22.8ma Gm=22,700 (6613)

1) 23.4ma Gm=25,400 (6552)

1) 22.3ma Gm=25,100 (6552)

1) 24.6ma Gm=25,600 (6539)

1) 24.0ma Gm=25,200 (6552)

1) 24.2ma Gm=25,000 (6539)

1) 23.6ma Gm=25,800 (6552)

1) 24.6ma Gm=27,300 (6526)

1) 22.9ma Gm=23,700 (6613)