4 US-Made 12X4 Black Plate Vacuum Tubes Valves Rectifiers Lot Of Four 6EM7 Octal 63-29 188-20 date/EIA codes

63-29 188-20 date/EIA codes

It measured 38/34 where minimum (65%) is 40/40 and 100% is 62/62

but with some wear

The Superior-tested tube measured "low to medium-good

4 US-Made 12X4 Black Plate Vacuum Tubes Valves Rectifiers Lot Of Four 6EM7 Octal 63-29 188-20 date/EIA codesThis lot of four US made black plate 12X4 rectifier tubes measured 43 46, 44 44, 45 49 and 48 48 on our Paul Hart calibrated TV7 U where minimum (65%) is 40 40 . They have black plates; crenelated mica spacers and excellent flashing. 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 TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY