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(!!) (#1 56 Pair) 56 Sylvania black plate NOS 1940's branded Western Electronics 1940's (6.4ma and 6.5ma) (Highest Ma and Gm)

$ 31.99

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

 

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