4 Sylvania 6SH7 Vacuum Tubes NOS NIB Lot Of Four XXFM Loktal 58 and 67 where minimum

58 and 67 where minimum (65%) is 48

It was made in Germany

new in box Raytheon 6DS4 nuvistor tube tested to spec on our Paul Hart-calibrated TV7/U

Philco-BRANDED 14AF7 / XXD chrome dome dual triode tested to spec on our Paul Hart-calibrated TV7/U

4 Sylvania 6SH7 Vacuum Tubes NOS NIB Lot Of Four XXFM Loktal 58 and 67 where minimumThese four new old stock, new in box Sylvania 6SH7 tubes tested to spec on our Paul Hart calibrated TV7 U. This RCA 807 output tube was tested with adapters on our Maxi Matcher 2 for shorts, gas and transconductance with 400 volts on the plates and a bias of 48 volts. There were no shorts or gas. Plate current draw was 19. 8 milliamps while transconductance measured 2440 micromhos. (New 807s typically test from the mid teens to mid 30s with