4 North American Number / Type 78 #78 Vacuum Tubes Valves Shoulder ST-Shape Lot Of Four NBC Orchestra This amp was designed to

This amp was designed to use 6SN7s and I do not recommend using 12SN7s

32 and 33 where minimum (65%) is 25

They sound spacious with excellent dynamic range and frequency response on these challenging pieces -- and are dead quiet when the CD player is muted

This tube has black plates

4 North American Number / Type 78 #78 Vacuum Tubes Valves Shoulder ST-Shape Lot Of Four NBC Orchestra This amp was designed toThis 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