70-79 TYPES
SYLVANIA
71 ST SHAPE
TRIAD
T-171A BALLOON
ARCTURUS
71 BLUE  BALLOON
Type 71A / 171A Triode
(71A=5V @ .25A Filament)
(Typical Characteristics:Vplate=135V, Vgrid=-27, Iplate=17.5ma, Rplate=1.82Kohms
Gm=1650, Mu=3, Rload=3Kohms, Pout=0.4watts)
Again,I have an assortment of styles and brands  of these tubes
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RATHEON 75
S SHAPE
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NATIONAL UNION
71
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71
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