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(!!) (#1 6AH4GT Pair) 6AH4GT Sylvania triple mica "D" getter NOS 1952-1953 (29.5ma and 30ma) matched within 1ma

$ 31.99

1 pair) 6AH4GT Sylvania NOS 1952-1953 same build

1 tube) 30ma Gm=4500 Sylvania branded Philco 1952 top mica tilted which doesn't matter 

1 tube) 29.5ma Gm=4500 Sylvania branded Hytron 1953 

Matched on Amplitrex 

Vplate=250V

Vgrid=-23V

Good Ma range 25-30ma

Good Gm range 4000-4500

TUBES PLUGGED INTO OCTAL SOCKETS FOR PICTURE

 

- deHavilland UltraVerve linestage preamp

 

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