2a3 tube NOS Raytheon pair tubes dual mono black box plate engraved 4 pillar rare 

2 tubes type 2A3 Raytheon 4 pillar  

dual box plate black box

bi-plate

hanging filament top springs 

silver foil getter bottom

black plate engraved 

own vintage carton box

original vintage tubes power triode direct heater triode for last stage audio 

tested on tube tester Hickok TV7D/U = 70 & 70 same emission for both tubes (reference good at 38) 

box 183