31_Philco_by_Sylvania_engraved_base_NOS_1930_s_11_5ma_Gm_1000

31 Philco by Sylvania engraved base NOS 1930”s (11.5ma Gm=1000)

Category: SKU: TOY390831

$4.50 $14.99

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31 Philco by Sylvania engraved base NOS 1930”s

11.5ma

Gm=1000

Tested on Amplitrex

Vplate=180V

Vgrid=-30V

Good NOS Ma = 11-12ma

Good NOS Gm = 1000

power triode

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