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(!!) (#1 37 Pair) 37 Sylvania NOS 1940's (6.8ma and 6.9ma) 1% matched

(!!) (#1 37 Pair) 37 Sylvania NOS 1940's (6.8ma and 6.9ma) 1% matched

$ 27.99

1 matched pair) 37 Sylvania NOS 1940's same build

 

1 tube) 6.8ma Gm=1000 (VT-76 Sylvania NOS 1940's )

1 tube) 6.9ma Gm=1000 (Sylvania branded RCA 

 

 

 

Test parameters:

Vplate=250V

Vgrid=-18V

Good Iplate Ma range = 6.5-8ma

Good Gm=1000-1100

 

(Filament=6.3V @ 300ma, many think the 37 sounds better than the 76)

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