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1 pair) 10=VT-25 SYLVANIA NOS 1940's in white boxes
1 tube) 27.0ma Gm=2100 (VT-25=10Y)
1 tube) 28.2ma Gm=2100 (JAN-CHS-10Y=VT-25)
Good current range 20-30ma
Vplate=300V
Vgrid=-15V