4 US-Made Number / Type 57 #57 Vacuum Tubes Lot Of Four 6AM4 NOS NIB It is very clean and

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

This low noise JJ 12AX7 / ECC83S dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

I am playing it in Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds excellent

new in box GE 6MJ8 tubes 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 It is very clean andThis 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