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(!!!!) (Best Single 1957) EL37 Mullard black plate NOS (2) upside-down cup-shape getter halos 1957 (74ma)

(!!!!) (Best Single 1957) EL37 Mullard black plate NOS (2) upside-down cup-shape getter halos 1957 (74ma)

$ 249.99

1 tube) EL37 Mullard black plate NOS (2) upside-down trough-shape getter halos (R61-B7A=1957) 

74ma

Gm=9000

 

Amplitrex test setup:

Vplate=250V

Screen=250V

Vgrid=-13.5V 

Good NOS Ma range = 70-90ma

Good Gm = 9000-10,000

 

 

Recommended for

- CARR MERCURY 2003

- Fisher 80-AZ

- Dared VP-20 amps

See more: vacuum tube
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