(!!) (Best Pair) 10Y=VT-25 Sylvania NOS 1940”s same build (29.4ma and 29.0ma)

1 pair) 10Y=VT-25 Sylvania NOS 1940”s in white boxes

• same internal build

1 tube) 29.4ma Gm=2200 (VT-25 Sylvania)

1 tube) 29.0ma Gm=2200 (JAN-CHS-10Y=VT-25 SYLVANIA) a few scratches over printing area

Good Ma range 20-30ma

Good Gm = 1700-2000

Vplate=300V

Vgrid=-15V