Mullard 5AR4 GZ34 Rectifier Vacuum Tube NOS-Testing Halifax Three These four RCA 7551 tubes

These four RCA 7551 tubes tested as follows on our Paul Hart-calibrated TV7/U:

2 milliamps with a transconductance of 5640 micromhos

This RCA 8008 rectifier tube appears unused

Plate current measured 33

Mullard 5AR4 GZ34 Rectifier Vacuum Tube NOS-Testing Halifax Three These four RCA 7551 tubesThis new old stock testing Mullard 5AR4 GZ34 rectifier tube tested an almost perfectly balanced 64 62 in sections One and Two, respectively, on our Paul Hart calibrated TV7 U where minimum (65%) is 40 40 and 62 62. There were no emissions drop running the filament at 4. 3 rather than five volts. It has an F32 B5A1 factory date code and the customary Mullard hole in its centering pin. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE