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(!!!) (Recommended Pair) 56 Sylvania black plate NOS 1943 (6.3ma and 6.2ma)

$ 27.99

1 pair) VT-56 Sylvania black plate NOS 1943 original boxes, 4 metal prongs on top mica, same internals

1 tube) 6.3ma Gm=1600

1 tube) 6.2ma Gm=1500

  

(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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