Western Electric™ 300B Vacuum Tube
Classification: Moderate power, filamentary triodes for Class A service.
Application: Audio-frequency amplifier in positions where power outputs of approximately ten watts or less are required at relatively low plate voltages.
The WE300B is a vacuum tube with a long history of high performance and great sound. The current generation of the 300B is receiving praise from a wide range of listeners and amplifier producers alike. Surf on in for more information!
WE300B tubes are
available in Singles or as Matched Pairs, Quads or Octets. The
performance curves for each tube produced are stored in the
computer which controls the test sequence. Another computer then
performs the matching algorithm, working from the entire single
Each tube ships
with a card which contains the actual performance curves for that
particular tube, not just the design curves. Note the serial
number and date of the test. Each card is printed on a printer
attached to the test station. The curves are measured for each
Dimensions: Dimensions, outline diagrams
of the tubes and bases, and the arrangement of electrode
connections to the base terminals are shown in Figures 1 and 2.
Characteristics of the 300B Vacuum Tube
Recommended Operating Conditions
Recommended and maximum conditions for alternating-current filament supply are given in the table. Recommended conditions or others of no greater severity should be selected in preference to maximum conditions wherever possible. The life of the tube at maximum operating conditions will be shorter than at the recommended conditions.
Where it is necessary to operate the tube at or near the maximum plate current of 100 milliamperes, provision should be made for adjusting the grid bias of each tube independently, so that the maximum safe plate current will not be exceeded in any tube. Alternatively, a self-biasing circuit may be used, in which the grid bias for the tube is obtained from the voltage drop produced by the plate current of that tube flowing through a resistance.
Where it is necessary to use a fixed grid bias,
the plate current of the average tube should be limited to a
maximum value of 70 milliamperes, so that tubes having plate
currents higher than the average will not exceed the maximum safe