4 US-Made Number / Type 57 #57 Vacuum Tubes Lot Of Four 6AM4 NOS NIB rectangular mica spacers and anode

rectangular mica spacers and anode radiators for cooler tube operation and longer life

It measured 77/90 where minimum (65%) is 62/62

It is very clean and in terrific shape with nary of a pop or tick

These GE 1622 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

new in box 6Z7G tube tested to spec on our Paul Hart-calibrated TV7/U

4 US-Made Number / Type 57 #57 Vacuum Tubes Lot Of Four 6AM4 NOS NIB rectangular mica spacers and anodeThis lot of four US made black glass as well as gray glass number type 57 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They measured (from left to right) 28, 38, 39 and 42 where minimum (65%) is 31 and 100% is 48. 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