4 North American Number / Type 78 #78 Vacuum Tubes Valves Shoulder ST-Shape Lot Of Four NBC Orchestra This tube has black plates

This tube has black plates

a button/thimble getter and excellent flashing

32 and 33 where minimum (65%) is 25

This Zenith 5Y4G rectifier tube tested 57/54 where minimum (65%) is 40/40 and 100% is 62/62

top O getters and large anode radiators for cooler operation and extended tube life

4 North American Number / Type 78 #78 Vacuum Tubes Valves Shoulder ST-Shape Lot Of Four NBC Orchestra This tube has black platesThis lot of four North American made number 78 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measured as follows: 35, 37, 44 and 45 where minimum is (65%) is 36 and 100% is 55. The Marconi is Canadian and the rest are American. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR