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Tube Specs

1 Matched Pair

Pentagrid converter

1940

engraved bases

original boxes with 291A data sheets

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Test Data

Test results on TV-7D/U:

1 tube) 60/25

1 tube) 56/25

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General Info

10V Filament

Vplate=180V

Vgrid1=7.5V

Vgrid2=180V

Vgrid3=75V

Vgrid4=-3V

Vgrid5=75V

Mu=275

Gm=690

Rp=400Kohms

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