NOS NIB JAN 6C4 Black Plate Rod Support USA Made Tube 1944. (up To 3 Available)

New old stock in original boxes Ken Rad Military JAN (Joint Army Navy) 6C4 USA Made tubes (made in 1944). Tubes have black plates with rod support. Tubes have been tested on a calibrated TV-7A/U tube tester.  All three tubes test over 90+ with 55 being minimum acceptance (65%).  This listing is for ONE tube, but feel to purchase 2 or all 3. Shipping will be adjusted when buying multiple tubes. I'm going to be listing more vintage audio and tube related listings.