4 US-Made Number / Type 57 #57 Vacuum Tubes Lot Of Four Mullard Tube Three: 40/2120 and

Tube Three: 40/2120 and

crenelated rectangular mica spacers

new in box and tested to spec on our Paul Hart-calibrated TV7/U

PLEASE BE PATIENT FOR THE FIRST DAY OR TWO IF THE PACKAGE IS STILL MARKED AS "PRE-TRANSIT

This matched pair of RCA-Victor dark-gray glass 6K6GT tubes was tested on our Maxi-Matcher tube tester with 325 volts on the plates and a bias of -36 volts

4 US-Made Number / Type 57 #57 Vacuum Tubes Lot Of Four Mullard Tube Three: 40/2120 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