291A Western Electric NOS around 1940 (1 pair)
$ 199.99
Tube Specs
1 Matched Pair
Pentagrid converter
1940
engraved bases
original boxes with 291A data sheets
Test Data
Test results on TV-7D/U:
1 tube) 60/25
1 tube) 56/25
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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