4 Amperex / Philips Group 1S2 1S2A DY87 Vacuum Tubes Valves NOS-Testing Lot Of Four JAN-CKR-2C22 7193 new in box Zenith 6DQ4

new in box Zenith 6DQ4 tube tested to spec on our Paul Hart-calibrated TV7/U

44 and 48 where minimum (65%) is 30

They have 2-30 188-5 and 3-52 188-5 date/provenance codes

Transconductance measured 48 for Tube One and 50 for Tube Two where minimum (65%) is 40 and 100% is 62

4 Amperex / Philips Group 1S2 1S2A DY87 Vacuum Tubes Valves NOS-Testing Lot Of Four JAN-CKR-2C22 7193 new in box Zenith 6DQ4This lot of three new old stock testing 1S2A DY87 tubes werw tested 68 on our Paul Hart calibrated TV7 U for shorts, gas and emissions. There were no shorts or gas and they measured as follows: 57, 67, 68 and 82 where minimum (65%) is 32 and 100% is 49. IN 2021 WE PURCHASED 150,000 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