(!!!!) (Best Pair) 56 Sylvania black plate NOS 1940's branded Western Electronics 1940's (6.4ma and 6.5ma) (Highest Ma and Gm)
$31.99
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1 pair) 56 Sylvania black plate NOS 1940's branded Western Electronics 1940's original boxes, 4 metal prongs on top mica, same internals 1 tube) 6.4ma Gm=1500 1 tube) 6.5ma Gm=1600 (Vfilament = 2.5 volts) Amplitrex Test: Vplate=250V Vgrid=-13.5V Iplate good range = 4.5-5.5ma Gm=1400 - Inspire LP-27A - DIY
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